<ol>
	<li>ASTM D1413-07. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Standard+test+method+for+testing+wood+preservatives+by+laboratory+soil-block+cultures.+.">Standard test method for testing wood preservatives by laboratory soil-block cultures. .</a> Annual Book of ASTM Standards. , 185-192 (2007).</li><li>Bravery, A. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> A miniaturized wood block for the rapid evaluation of wood preservative fungicides. , (1978).</li><li>Low, G. A., Young, M. E., Martin, P., Palfreyman, J. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Assessing+the+relationship+between+the+dry+rot+fungus+Serpula+lacrymans+and+selected+forms+of+masonry.">Assessing the relationship between the dry rot fungus Serpula lacrymans and selected forms of masonry.</a> Int. Biodeterior. Biodegrad. 46, 141-150 (2000).</li><li>Nicolas, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Volume+I+(One/1)+-+Degradation+and+Protection+of+Wood+(Syracuse+Wood+Science+Series+#5).">Volume I (One/1) - Degradation and Protection of Wood (Syracuse Wood Science Series #5).</a> Wood Deterioration and Its Prevention by Preservative Treatments. , (1973).</li><li>Schilling, J. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effects+of+calcium-based+materials+and+iron+impurities+on+wood+degradation+by+the+brown+rot+fungus+Serpula+lacrymans.">Effects of calcium-based materials and iron impurities on wood degradation by the brown rot fungus Serpula lacrymans.</a> Holzforschung. 64, 93-99 (2010).</li></ol>

Nessun conflitto di interessi dichiarati.

Utilizzando il nostro agar-block set-up (Figura 1) lacrymans Serpula cresciuto a diretto contatto con le superfici in gesso e in blocchi di legno (Figura 2), portando a oltre il 60% di perdita di peso nel marrone-decomporsi controllo blocchi di pino (Figura 3 ). Questo soddisfa facilmente l&#39;obiettivo standard ASTM di decadimento&gt; 50% e il coefficiente medio di variazione (C V) nel decadimento in era 0,055 alla settimana 16. Questi dati vengono pubblicati in Schilling 7. Ancora una v...

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		<th>Comment</th>
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<tr>
<td>Petri dishes</td>
<td>&nbsp;</td>
<td>Nunc</td>
<td>4014</td>
<td>25 x 150 mm</td>
</tr>
<tr>
<td>Agar, Type A</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>A4550</td>
<td>&nbsp;</td>
<tr>
<td>Ammonium nitrate, NH4NO3</td>
<td>&nbsp;</td>
<td>Millinckrodt</td>
<td>3436-12</td>
<td>&nbsp;</td>
<tr>
<td>Potassium phosphate, KH2PO4</td>
<td>&nbsp;</td>
<td>J.T. Baker</td>
<td>3246-01</td>
<td>&nbsp;</td>
<tr>
<td>Magnesium sulfate 7-hydrate, MgSO4&bull;7H2O</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>230391</td>
<td>&nbsp;</td>
<tr>
<td>D-(+)-Glucose</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>G8270</td>
<td>Dextrose</td>
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<td>Boric acid, H3BO4</td>
<td>&nbsp;</td>
<td>Mallinckrodt</td>
<td>2549-04</td>
<td>&nbsp;</td>
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<td>Zinc sulfate 7-hydrate, ZnSO4&bull;7H2O</td>
<td>&nbsp;</td>
<td>Mallinckrodt</td>
<td>8880-12</td>
<td>&nbsp;</td>
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<td>Manganous chloride 4-hydrate, MnCl2&bull;4H2O</td>
<td>&nbsp;</td>
<td>J.T. Baker</td>
<td>2540-04</td>
<td>&nbsp;</td>
<tr>
<td>Copper(II) sulfate 5-hydrate, CuSO4&bull;5H2O</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>209198</td>
<td>&nbsp;</td>
<tr>
<td>Ammonium heptamolybdate 4-hydrate, (NH4)6Mo7O24&bull;4H2O</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>431346</td>
<td>&nbsp;</td>
<tr>
<td>Calcium chloride dihydrate, CaCl2&bull;2H2O</td>
<td>&nbsp;</td>
<td>Mallinckrodt</td>
<td>4160-12</td>
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<td>Sodium chloride, NaCl</td>
<td>&nbsp;</td>
<td>Mallinckrodt</td>
<td>7581-12</td>
<td>&nbsp;</td>
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<td>&nbsp;</td>
<td>Mallinckrodt</td>
<td>5056-12</td>
<td>&nbsp;</td>
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<td>Pipet-aid</td>
<td>&nbsp;</td>
<td>Drummond</td>
<td>4-000-110</td>
<td>Cordless 
EtOH the surface</td>
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<td>10 ml sterile polystyrene pipette</td>
<td>&nbsp;</td>
<td>BD Biosciences</td>
<td>357551</td>
<td>&nbsp;</td>
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<td>Gutter Guard</td>
<td>&nbsp;</td>
<td>Thermwell Products Co.</td>
<td>VX620</td>
<td>Pre-scrubbed with soap 
Hardware store</td>
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<tr>
<td>Calcium sulfate hemihydrate, CaSO4&bull;0.5H2O</td>
<td>&nbsp;</td>
<td>Acros Organics</td>
<td>385355000</td>
<td>&nbsp;</td>
<tr>
<td>#4 cork borer</td>
<td>&nbsp;</td>
<td>Boekel</td>
<td>1601</td>
<td>&nbsp;</td>
<tr>
<td>Parafilm "M"</td>
<td>&nbsp;</td>
<td>Pechiney</td>
<td>PM-996</td>
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agar-block microcosms for controlled plant tissue decomposition by aerobic fungi

I due metodi principali per lo studio biodegradazione fungine dei tessuti vegetali lignocellulosiche sono stati sviluppati per i test del legno (suolo-block; agar-block). E &#39;ben accettato che il suolo-block microcosmi rendimenti più elevati tassi di decadimento, meno problemi di umidità, bassa variabilità tra gli studi, e soglie più elevate di tossicità conservante. Suolo-block test è quindi la tecnica più utilizzata ed è stato standardizzato dalla American Society for Testing and Materials (ASTM) (metodo D 1413-07). Il terreno blocco design è inconvenienti, però, utilizzando fonti suolo localmente variabile e nel limitare il controllo delle sostanze nutritive esterna (esogena) ai tessuti in decomposizione. Questi svantaggi sono emersi come un problema per l&#39;applicazione di questo metodo per gli altri, ha come obiettivo la ricerca sempre più popolare. Questi obiettivi includono moderni legnocellulosa degradante per la ricerca per la bioenergia, il collaudo biorisanamento di co-metabolizzata sostanze tossiche, valutando i meccanismi ossidativi e il monitoraggio elementi traslocato lungo le reti ifale. Suolo blocchi non prestano abbastanza controllo in queste applicazioni. Un raffinato agar-block approccio è necessario. Qui usiamo il marciume bruno legno degradanti fungo lacrymans Serpula a degradare legno in agar-blocco microcosmi, con profondo Petri con basso contenuto di calcio agar. Testiamo il ruolo di esogeni gesso su decadimento in una serie temporale, per dimostrare l&#39;utilità e la variabilità attesa. Isolati da una singola scheda rip (taglio longitudinale) sono condizionati, pesato, in autoclave, e introdotto in modo asettico in cima a una rete di plastica. Vaccinazioni fungine sono in ogni faccia del blocco, con esogena gesso aggiunti alle interfacce. Raccolti sono asettiche fino al raccolto finale distruttivo. Questi microcosmi sono progettati per evitare il contatto blocco con agar o pareti piastra di Petri. Condensa è ridotto al minimo durante piatto versa e durante l&#39;incubazione. Infine, l&#39;inoculo / gesso / legno spazio è ridotto al minimo, ma senza permettere contatto. Questi aspetti meno tecnici di agar-block design sono anche le cause più comuni di fallimento e la principale fonte di variabilità tra gli studi. Pubblicazione del video è quindi utile in questo caso, e dimostriamo a bassa variabilità, risultati di alta qualità.

Watch this Scientific Journal Video about Agar-Block Microcosms for Controlled Plant Tissue Decomposition by Aerobic Fungi at JoVE.com

Agar-Block Microcosms for Controlled Plant Tissue Decomposition by Aerobic Fungi

Questo video dimostra un approccio controllato ambiente per studiare la degradazione dei tessuti vegetali lignocellulosici da funghi aerobico. La capacità di controllare le fonti di nutrienti e l&#39;umidità è un vantaggio chiave di agar-block microcosmi, ma l&#39;approccio produce spesso alterne fortune. Ci rivolgiamo insidie ​​critici cedere riproducibile, a bassa variabilità dei risultati.

Agar-Block Microcosmi per decomposizione controllata tessuti vegetali da Funghi aerobica

The two principal methods for studying fungal biodegradation of lignocellulosic plant tissues were developed for wood preservative testing (soil-block; ...

agar-block-microcosms-for-controlled-plant-tissue-decomposition

Research

JoVE Journal

Biology

14.9K Views.  University of Minnesota. Questo video dimostra un approccio controllato ambiente per studiare la degradazione dei tessuti vegetali lignocellulosici da funghi aerobico. La capacità di controllare le fonti di nutrienti e l'umidità è un vantaggio chiave di agar-block microcosmi, ma l'approccio produce spesso alterne fortune. Ci rivolgiamo insidie ​​critici cedere riproducibile, a bassa variabilità dei risultati.

Video: Agar-Block Microcosms for Controlled Plant Tissue Decomposition by Aerobic Fungi

Measuring Plant Cell Wall Extension (Creep) Induced by Acidic pH and by Alpha-Expansin

Growing plant cell walls characteristically exhibit a property known as 'acid growth', by which we mean they are more extensible at low pH (&lt; 5) 1. The plant hormone auxin rapidly stimulates cell elongation in young stems and similar tissues at least in part by an acid-growth mechanism 2, 3. Auxin activates a H+ pump in the plasma membrane, causing acidification of the cell wall solution. Wall acidification activates expansins, which are endogenous cell wall-loosening proteins 4, causing the cell wall to yield to the wall tensions created by cell turgor pressure. As a result, the cell begins to enlarge rapidly. This 'acid growth' phenomenon is readily measured in isolated (nonliving) cell wall specimens. The ability of cell walls to undergo acid-induced extension is not simply the result of the structural arrangement of the cell wall polysaccharides (e.g. pectins), but depends on the activity of expansins 5. Expansins do not have any known enzymatic activity and the only way to assay for expansin activity is to measure their induction of cell wall extension. This video report details the sources and preparation techniques for obtaining suitable wall materials for expansin assays and goes on to show acid-induced extension and expansin-induced extension of wall samples prepared from growing cucumber hypocotyls.
 To obtain suitable cell wall samples, cucumber seedlings are grown in the dark, the hypocotyls are cut and frozen at -80 &deg;C. Frozen hypocotyls are abraded, flattened, and then clamped at constant tension in a special cuvette for extensometer measurements. To measure acid-induced extension, the walls are initially buffered at neutral pH, resulting in low activity of expansins that are components of the native cell walls. Upon buffer exchange to acidic pH, expansins are activated and the cell walls extend rapidly. We also demonstrate expansin activity in a reconstitution assay. For this part, we use a brief heat treatment to denature the native expansins in the cell wall samples. These inactivated cell walls do not extend even in acidic buffer, but addition of expansins to the cell walls rapidly restores their ability to extend.

Measuring Plant Cell Wall Extension Creep Induced by Acidic pH and by Alpha-Expansin

We demonstrate the use of a constant-force extensometer to measure long-term extension (creep) of plant cell wall specimens induced by acidic buffers and expansin protein.

Cella di misura Estensione impianto a parete (Creep), indotta dal pH acido e da Alpha-espansina

Growing plant cell walls characteristically exhibit a property known as 'acid growth', by which we mean they are more extensible at low pH (&lt; 5) 1. The ...

Ricerca

Biologia

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

The quantity and quality of detritus entering the soil determines the rate of decomposition by microbial communities as well as recycle rates of nitrogen (N) and carbon (C) sequestration1,2. Plant litter comprises the majority of detritus3, and so it is assumed that decomposition is only marginally influenced by biomass inputs from animals such as herbivores and carnivores4,5. However, carnivores may influence microbial decomposition of plant litter via a chain of interactions in which predation risk alters the physiology of their herbivore prey that in turn alters soil microbial functioning when the herbivore carcasses are decomposed6. A physiological stress response by herbivores to the risk of predation can change the C:N elemental composition of herbivore biomass7,8,9 because stress from predation risk increases herbivore basal energy demands that in nutrient-limited systems forces herbivores to shift their consumption from N-rich resources to support growth and reproduction to C-rich carbohydrate resources to support heightened metabolism6. Herbivores have limited ability to store excess nutrients, so stressed herbivores excrete N as they increase carbohydrate-C consumption7. Ultimately, prey stressed by predation risk increase their body C:N ratio7,10, making them poorer quality resources for the soil microbial pool likely due to lower availability of labile N for microbial enzyme production6. Thus, decomposition of carcasses of stressed herbivores has a priming effect on the functioning of microbial communities that decreases subsequent ability to of microbes to decompose plant litter6,10,11.
We present the methodology to evaluate linkages between predation risk and litter decomposition by soil microbes. We describe how to: induce stress in herbivores from predation risk; measure those stress responses, and measure the consequences on microbial decomposition. We use insights from a model grassland ecosystem comprising the hunting spider predator (Pisuarina mira), a dominant grasshopper herbivore (Melanoplus femurrubrum),and a variety of grass and forb plants9.

We present methods to evaluate how predation risk can alter the chemical quality of herbivore prey by inducing dietary changes to meet demands of heightened stress, and how the decomposition of carcasses from these stressed herbivores slows subsequent plant litter decomposition by soil microbes.

Collegamento rischio di predazione, stress Herbivore fisiologica e decomposizione microbica dei Rifiuti vegetali

The quantity and quality of detritus entering the soil  determines the rate of decomposition by microbial communities as well as  recycle rates of ...

Isolation of Viable Multicellular Glands from Tissue of the Carnivorous Plant, Nepenthes

Many plants possess specialized structures that are involved in the production and secretion of specific low molecular weight compounds and proteins. These structures are almost always localized on plant surfaces. Among them are nectaries or glandular trichomes. The secreted compounds are often employed in interactions with the biotic environment, for example as attractants for pollinators or deterrents against herbivores.
Glands that are unique in several aspects can be found in carnivorous plants. In so-called pitcher plants of the genus Nepenthes, bifunctional glands inside the pitfall-trap on the one hand secrete the digestive fluid, including all enzymes necessary for prey digestion, and on the other hand take-up the released nutrients. Thus, these glands represent an ideal, specialized tissue predestinated to study the underlying molecular, biochemical, and physiological mechanisms of protein secretion and nutrient uptake in plants. Moreover, generally the biosynthesis of secondary compounds produced by many plants equipped with glandular structures could be investigated directly in glands.
In order to work on such specialized structures, they need to be isolated efficiently, fast, metabolically active, and without contamination with other tissues. Therefore, a mechanical micropreparation technique was developed and applied for studies on Nepenthes digestion fluid. Here, a protocol is presented that was used to successfully prepare single bifunctional glands from Nepenthes traps, based on a mechanized microsampling platform. The glands could be isolated and directly used further for gene expression analysis by PCR techniques after preparation of RNA.

Isolation of Viable Multicellular Glands from Tissue of the Carnivorous Plant, Nepenthes

Plants glands are specialized structures responsible for the biosynthesis and secretion of many compounds involved in interactions with the biotic environment. To enable studies on their molecular and biochemical features, a mechanical micropreparation technique was established in order to isolate single metabolically active glands, here from the carnivorous plant Nepenthes.

Many plants possess specialized structures that are involved in the production and secretion of specific low molecular weight compounds and proteins. ...

In Vivo 4-Dimensional Tracking of Hematopoietic Stem and Progenitor Cells in Adult Mouse Calvarial Bone Marrow

Through a delicate balance between quiescence and proliferation, self renewal and production of differentiated progeny, hematopoietic stem cells (HSCs) maintain the turnover of all mature blood cell lineages. The coordination of the complex signals leading to specific HSC fates relies upon the interaction between HSCs and the intricate bone marrow microenvironment, which is still poorly understood[1-2].
We describe how by combining a newly developed specimen holder for stable animal positioning with multi-step confocal and two-photon in vivo imaging techniques, it is possible to obtain high-resolution 3D stacks containing HSPCs and their surrounding niches and to monitor them over time through multi-point time-lapse imaging. High definition imaging allows detecting ex vivo labeled hematopoietic stem and progenitor cells (HSPCs) residing within the bone marrow. Moreover, multi-point time-lapse 3D imaging, obtained with faster acquisition settings, provides accurate information about HSPC movement and the reciprocal interactions between HSPCs and stroma cells.
Tracking of HSPCs in relation to GFP positive osteoblastic cells is shown as an exemplary application of this method. This technique can be utilized to track any appropriately labeled hematopoietic or stromal cell of interest within the mouse calvarium bone marrow space.

In Vivo 4-Dimensional Tracking of Hematopoietic Stem and Progenitor Cells in Adult Mouse Calvarial Bone Marrow

The nature of the interactions between hematopoietic stem and progenitor cells (HSPCs) and bone marrow niches is poorly understood. Custom hardware modifications and a multi-step acquisition protocol allow the use of two-photon and confocal microscopy to image ex vivo labeled HSPCs homed within bone marrow areas, tracking interactions and movement.

In Vivo inseguimento 4-dimensionale di emopoietiche staminali e progenitrici celle di topo adulto cranica di Midollo Osseo

Through a delicate balance between quiescence and proliferation, self renewal and production of differentiated progeny, hematopoietic stem cells (HSCs) ...

High-throughput CRISPR Vector Construction and Characterization of DNA Modifications by Generation of Tomato Hairy Roots

Targeted DNA mutations generated by vectors with clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 technology have proven useful for functional genomics studies. While most cloning strategies are simple to perform, they generally use multiple steps and can require several days to generate the ultimate constructs. The method presented here is based on DNA assembly and can produce fully functional CRISPR vectors in a single cloning reaction. Vector construction can also be pooled, further increasing the efficiency and utility of the process. A modification of the method is used to create CRISPR vectors with multiple gene targets. CRISPR vectors are then transformed into tomato hairy roots to generate transgenic materials with targeted DNA modifications. Hairy roots are a useful system for testing vector functionality as they are technically simple to generate and amenable to large-scale production. The methods presented here will have wide application as they can be used to generate a variety of CRISPR vectors and be used in a wide range of plant species.

Using DNA assembly, multiple CRISPR vectors can be constructed in parallel in a single cloning reaction, making the construction of large numbers of CRISPR vectors a simple task. Tomato hairy roots are an excellent model system to validate CRISPR vectors and generate mutant materials.

High-throughput CRISPR vettore Costruzione e caratterizzazione di modifiche del DNA da Generazione di Roots pomodoro Peloso

Targeted DNA mutations generated by vectors with clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 technology have proven useful for ...

Hybrid-Cut: An Improved Sectioning Method for Recalcitrant Plant Tissue Samples

Maintaining plant section integrity is essential for studying detailed anatomical structures at the cellular, tissue, or even organ level. However, some plant cells have rigid cell walls, tough fibers and crystals (calcium oxalate, silica, etc.), and high water content that often disrupt tissue integrity during plant tissue sectioning.
This study establishes a simple Hybrid-Cut tissue sectioning method. This protocol modifies a paraffin-based sectioning technique and improves the integrity of tissue sections from different plants. Plant tissues were embedded in paraffin before sectioning in a cryostat at -16 &#176;C. Sectioning under low temperature hardened the paraffin blocks, reduced tearing and scratching, and improved tissue integrity significantly. This protocol was successfully applied to calcium oxalate-rich Phalaenopsis orchid tissues as well as recalcitrant tissues such as reproductive organs and leaves of rice, maize, and wheat. In addition, the high quality of tissue sections from Hybrid-Cut could be used in combination with in situ hybridization (ISH) to provide spatial expression patterns of genes of interest. In conclusion, this protocol is particularly useful for recalcitrant plant tissue containing high crystal or silica content. Good quality tissue sections enable morphological and other biological studies.

This protocol describes a simple Hybrid-Cut tissue sectioning method that is useful for recalcitrant plant tissues. Good quality tissue sections enable anatomical studies and other biological studies including in situ hybridization (ISH).

Hybrid-Cut: Un metodo sezionamento migliorato per Recalcitrante tessuti vegetali Campioni

Maintaining plant section integrity is essential for studying detailed anatomical structures at the cellular, tissue, or even organ level. However, some ...

Activating Autophagy by Aerobic Exercise in Mice

Autophagy is a lysosomal degradation pathway essential for cell homeostasis, function and differentiation. Under stress conditions, autophagy is induced and targets various cargos, such as bulk cytosol, damaged organelles and misfolded proteins, for degradation in lysosomes. Resulting nutrient molecules are recycled back to the cytosol for new protein synthesis and ATP production. Upregulation of autophagy has beneficial effects against the pathogenesis of many diseases, and pharmacological and physiological strategies to activate autophagy have been reported. Aerobic exercise is recently identified as an efficient autophagy inducer in multiple organs in mice, including muscle, liver, heart and brain. Here we show procedures to induce autophagy in vivo by either forced treadmill exercise or voluntary wheel running. We also demonstrate microscopic and biochemical methods to quantitatively analyze autophagy levels in mouse tissues, using the marker proteins LC3 and p62 that are transported to and degraded in lysosomes along with autophagosomes.

Autophagy activation is beneficial in the prevention of a number of diseases. One of the physiological approaches to induce autophagy in vivo is physical exercise. Here we show how to activate autophagy by aerobic exercise and measure autophagy levels in mice.

Attivazione di autofagia per esercizio aerobico nei topi

Autophagy is a lysosomal degradation pathway essential for cell homeostasis, function and differentiation. Under stress conditions, autophagy is induced ...

Laser-Capture Microdissection RNA-Sequencing for Spatial and Temporal Tissue-Specific Gene Expression Analysis in Plants

The development of a complex multicellular organism is governed by distinct cell types that have different transcriptional profiles. To identify transcriptional regulatory networks that govern developmental processes it is necessary to measure the spatial and temporal gene expression profiles of these individual cell types. Therefore, insight into the spatio-temporal control of gene expression is essential to gain understanding of how biological and developmental processes are regulated. Here, we describe a laser-capture microdissection (LCM) method to isolate small number of cells from three barley embryo organs over a time-course during germination followed by transcript profiling. The method consists of tissue fixation, tissue processing, paraffin embedding, sectioning, LCM and RNA extraction followed by real-time PCR or RNA-seq. This method has enabled us to obtain spatial and temporal profiles of seed organ transcriptomes from varying numbers of cells (tens to hundreds), providing much greater tissue-specificity than typical bulk-tissue analyses. From these data we were able to define and compare transcriptional regulatory networks as well as predict candidate regulatory transcription factors for individual tissues. The method should be applicable to other plant tissues with minimal optimization.

Presented here is a protocol for laser-capture microdissection (LCM) of plant tissues. LCM is a microscopic technique for isolating areas of tissue in a contamination-free manner. The procedure includes tissue fixation, paraffin embedding, sectioning, LCM and RNA extraction. RNA is used in the downstream tissue-specific, temporally resolved analysis of transcriptomes.

Microsezione laser-cattura RNA-Sequenziamento per l'analisi dell'espressione genica spaziale e temporale specifica del tessuto nelle piante

The development of a complex multicellular organism is governed by distinct cell types that have different transcriptional profiles. To identify ...

Determination of Tripartite Interaction between Two Monomers of a MADS-box Transcription Factor and a Calcium Sensor Protein by BiFC-FRET-FLIM Assay

Protein-protein interactions are an integral part of all biological processes in the cells as they play a crucial role in regulating, maintaining, and amending cellular functions. These interactions are involved in a wide range of phenomena such as signal transduction, pathogen response, cell-cell interactions, metabolic and developmental processes. In the case of transcription factors, these interactions may lead to oligomerization of subunits, sequestering in specific subcellular contexts such as the nucleus, cytoplasm, etc., which, in turn, might have a more profound effect on the expression of the downstream genes. Here, we demonstrate a methodology to visualize in vivo tripartite interaction using Bimolecular Fluorescence Complementation (BiFC) based F&#246;rster Resonance Energy Transfer (FRET) involving Fluorescence Lifetime Imaging (FLIM). Two of the proteins selected for this demonstration interact as BiFC partners, and their reconstituted fluorescence activity is used to assay FRET-FLIM with the third partner. Four to five-week-old growth-chamber-grown Nicotiana benthamiana plants have been used as the model plant system for this demonstration.

Here we present, a method to visualize ternary complex formation between three protein partners using fluorescent-tagged proteins by BiFC based FRET-FLIM assay. This method is valuable for studying protein-protein interaction complexes in vivo.

Determinazione dell'interazione tripartita tra due monomeri di un fattore di trascrizione MADS-box e una proteina sensore di calcio mediante saggio BiFC-FRET-FLIM

Protein-protein interactions are an integral part of all biological processes in the cells as they play a crucial role in regulating, maintaining, and ...

Comparison of Methods for Isolating Entomopathogenic Fungi from Soil Samples

The goal of the present study is to compare the effectiveness of using insect baits versus artificial selective medium for isolating entomopathogenic fungi (EPF) from soil samples. The soil is a rich habitat for microorganisms, including EPF particularly belonging to the genera Metarhizium and Beauveria, which can regulate arthropod pests. Biological products based on fungi are available in the market mainly for agricultural arthropod pest control. Nevertheless, despite the high endemic biodiversity, only a few strains are used in commercial bioproducts worldwide. In the present study, 524 soil samples were cultured on potato dextrose agar enriched with yeast extract supplemented with chloramphenicol, thiabendazole, and cycloheximide (CTC medium). The growth of fungal colonies was observed for 3 weeks. All Metarhizium and Beauveria EPF were morphologically identified at the genus level. Additionally, some isolates were molecularly identified at the species level. Twenty-four out of these 524 soil samples were also surveyed for EPF occurrence using the insect bait method (Galleria mellonella and Tenebrio molitor). A total of 51 EPF strains were isolated (41 Metarhizium spp. and 10 Beauveria spp.) from the 524 soil samples. All fungal strains were isolated either from croplands or grasslands. Of the 24 samples selected for comparison, 91.7% were positive for EPF using Galleria bait, 62.5% using Tenebrio bait, and 41.7% using CTC. Our results suggested that using insect baits to isolate the EPF from the soil is more efficient than using the CTC medium. The comparison of isolation methods in addition to the identification and conservation of EPF has a positive impact on the knowledge about biodiversity. The improvement of EPF collection supports scientific development and technological innovation.

Entomopathogenic fungal colonies are isolated from tropical soil samples using Tenebrio bait, Galleria bait, as well as selective artificial medium, i.e., potato dextrose agar enriched with yeast extract supplemented with chloramphenicol, thiabendazole, and cycloheximide (CTC medium).

Confronto dei metodi per isolare i funghi entomopatogeni da campioni di suolo

The goal of the present study is to compare the effectiveness of using insect baits versus artificial selective medium for isolating entomopathogenic ...