Name: Production of Composite Plants by Agrobacterium rhizogenes-Based Hairy Root Transformation
Uploaded: 2023-06-30T14:20:00
Description: Watch this Scientific Journal Video about Production of Composite Plants by Agrobacterium rhizogenes-Based Hairy Root Transformation at JoVE.com

production of composite plants by agrobacterium rhizogenes-based hairy root transformation

Método de transformación de raíces peludas de un solo paso para avanzar en la biología relacionada con las raíces

Agrobacterium rhizogenes is a gram-negative soil bacterium from the family Rhizobiaceae. A. rhizogenes can infect almost all dicotyledons, a few monocotyledons, and individual gymnosperms through wounds, producing hairy roots in infected plants. The bacterium carries the Ri (root-inducing) plasmid, and the T-DNA of the Ri plasmid carries the opine synthesis gene and rol genes (root locus genes). After the T-DNA of the Ri plasmid enters a plant cell and is integrated into a host chromosome, the expression of the rol genes induces production of hairy roots1. A plant binary expression vector carrying a target gene is transformed into A. rhizogenes, and the transformed A. rhizogenes is used to infect a plant. Transgenic roots can be induced in infected plants, producing composite plants containing transgenic roots and nontransgenic stems and buds. Generally, a composite plant can be obtained within 14-20 days. A. rhizogenes-mediated hairy root transformation is generally not limited by genotype in dicotyledonous plants2. The hairy roots produced by A. rhizogenes-infected plants are characterized by a fast growth rate, stable inheritance, and easy operation. Hairy root transformation mediated by A. rhizogenes is currently widely used to study root-related biology. Furthermore, the transformation of hairy roots can also be used to validate and optimize the target-editing efficiency of the CRISPR/Cas9 system3,4,5 and protein subcellular localization. Therefore, hairy root transformation is an important tool in research on plant gene function, metabolic engineering, and interactions between roots and rhizosphere microorganisms6,7,8.
Composite plants containing transgenic roots obtained through hairy root transformation have been widely produced in dicotyledonous plants, especially in legumes. The traditional method of injecting the hypocotyl with A. rhizogenes has been used to produce composite Lotus corniculatus9, soybeans10, tomato11, sweet potatoes12,&#160;and many other plants5,8. The hypocotyl-injection method is inefficient and is likely to cause the death of young or tiny hypocotyl plants. Therefore, the method was improved by cutting off the embryonic roots, coating the seedling incision with A. rhizogenes, and then placing the hypocotyl on sterile culture medium for rooting cultivation13. However, those steps are performed in a sterile environment, and the operation steps are relatively cumbersome. In particular, the resulting composite plants need to be transplanted, which increases the amount of work. In previous work, one-step A. rhizogenes-mediated (ARM) hairy root transformation was established in cucumber, soybean, Lotus japonicus, Medicago truncatula,&#160;and tomato2,14,15,16,17. The primary root and partial hypocotyl were removed, the incision site of the remaining hypocotyl was coated with transformed A. rhizogenes, and the seedling was then planted into moist sterile vermiculite. After 12 days of cultivation, hairy roots were produced at the incision site. The one-step ARM method is highly efficient and requires less time to produce hairy roots. Transplanting after forming hairy roots is also not necessary. Because microbial contamination can be avoided without transplantation, the one-step ARM method can be particularly useful when studying interactions between plants and microorganisms, such as symbiotic nitrogen fixation between leguminous plants and Rhizobia, and symbioses between plants and arbuscular mycorrhizal fungi. In this paper, a detailed one-step A. rhizogenes-mediated&#160;hairy root transformation protocol is provided with examples of composite plants produced in wild soybean, Solanum americanum, and pumpkin. With the protocol, researchers can smoothly perform the one-step ARM transformation.

Autor destacado: Racionalización de la producción de plantas compuestas a través de la transformación de raíces pilosas mediada por Agrobacterium rhizogenes 

Un método eficiente y reproducible para producir plantas compuestas mediante la transformación de raíces peludas basadas en Agrobacterium rhizogenes

Our team focuses on Agrobacterium rhizogenes-based hairy root transformation. Hairy root transformation is crucial in studying plant gene function, metabolic engineering, and interactions between roots and Rhizosphere microorganisms. This article provides a one-step transformation method, mediated by Agrobacterium rhizogenes.Hairy root transformation is established in various dicotyledons and monocotyledons species, and is almost independent with the genotype. The one-step method mediated by Agrobacterium rhizogenes for inducing hairy roots is simpler and more efficient for creating composite plants compared to the hypocotyl injection method. The hypocotyl injection method is inefficient and is likely to cause the death of young or tiny hypocotyl plants.The one-step Agrobacterium rhizogenes-mediated method is highly efficient and requires less time to produce hairy roots. Moreover, there is no need for transplanting past the formation of hairy roots. Alpha-sign regulation genes and beta-sign synthesis genes were used as viral screen markers in hairy root transformation mediated by Agrobacterium rhizogenes.

Watch this Scientific Journal Video about Production of Composite Plants by Agrobacterium rhizogenes-Based Hairy Root Transformation at JoVE.com

Production of Composite Plants by Agrobacterium rhizogenes-Based Hairy Root Transformation  

Producción de plantas compuestas mediante transformación de raíces peludas basada en Agrobacterium rhizogenes

Comience recolectando semillas de soja silvestre, S.Americanum y la variedad local de calabaza. Siembre las semillas en vermiculita a una profundidad de un centímetro y riéguelas bien. Cultívalos en una cámara de crecimiento a aproximadamente un 70% de humedad relativa.Retire la cepa K599 de A.rhizogenes del congelador a 80 grados centígrados y actívela en un medio sólido LB a 28 grados centígrados durante 48 horas. A continuación, seleccione un solo clon de la cepa K599 y cultívelo en un mililitro de antibiótico líquido que contenga medio LB durante 12 horas. Extienda 500 microlitros de la suspensión bacteriana de manera uniforme sobre un antibiótico sólido que contenga medio LB e incube a 28 grados centígrados durante 24 horas.Después de siete días, cuando los cotiledones de las plántulas estén desplegados, use un bisturí afilado esterilizado para cortar aproximadamente de 0,5 a un centímetro del hipocótilo. Deseche la raíz primaria y una parte del hipocótilo. Cubra la incisión del hipocótilo con la bacteria K599.Plante plántulas en vermiculita húmeda e infecte 30 plantas de cada especie utilizando la transformación de raíces peludas mediada por A. rhizogenes. A continuación, riegue las plantas con cinco mililitros de suspensión bacteriana K599 resuspendida en medio básico Gamborg B5 de un cuarto de concentración. Cubre las macetas con una bolsa de plástico transparente y colócalas en una cámara de crecimiento.Cultive las plantas durante aproximadamente 12 días después de la inoculación. En este momento, se deben generar nuevas raíces pilosas en el sitio de la incisión, que generalmente alcanzan longitudes de dos a cinco centímetros. Utilizando un sistema de imágenes de luminiscencia CAMI con luz de excitación verde a 540 nanómetros y emisión a 600 nanómetros, detecte la expresión del gen reportero DsRed2.Se visualizan las raíces de plantas compuestas de soja silvestre, S.Americanum y calabaza bajo luz de excitación natural y verde.

production-composite-plants-agrobacterium-rhizogenes-based-hairy-root

Research

JoVE Journal

Biology

Production of Composite Plants by Agrobacterium rhizogenes-Based Hairy Root Transformation

An Efficient and Reproducible Method for Producing Composite Plants by Agrobacterium rhizogenes-Based Hairy Root Transformation

Producing composite plants with transgenic roots and nontransgenic stems and buds using Agrobacterium rhizogenes-mediated hairy root transformation is a powerful tool to study root-related biology. Hairy root transformation is established in a wide range of dicotyledons and in several monocotyledon species and is almost independent of the genotype. The traditional method of hypocotyl injection with A. rhizogenes to obtain composite plants is inefficient, time-consuming, laborious, and frequently causes the death of tender and tiny hypocotyl plants. A highly efficient, one-step hairy root transformation mediated by A. rhizogenes was established previously, which eliminates the need for transplanting after producing hairy roots. In this study, a partial hypocotyl and primary root were removed, the hypocotyl incision site was coated with A. rhizogenes, and&#160;then hypocotyls were planted in sterile vermiculite. After 12 days of cultivation, the hypocotyl incision expanded and new hairy roots were induced. This article provides the detailed protocol of a one-step transformation method mediated by A. rhizogenes, with its effectiveness demonstrated by producing composite plants of wild soybean, Solanum americanum, and pumpkin.

Here, we provide the detailed protocol of a one-step transformation method mediated by Agrobacterium tumefaciens to produce composite plants.

Producing composite plants with transgenic roots and nontransgenic stems and buds using Agrobacterium rhizogenes-mediated hairy root transformation is a ...

Investigación

Biología

Begin by collecting seeds of wild soybean, S.Americanum, and the local variety of pumpkin. Sow the seeds in vermiculite at a depth of one centimeter and water them thoroughly. Cultivate them in a growth chamber at approximately 70%relative humidity.Remove the A.rhizogenes strain K599 from the 80 degrees Celsius freezer and activate it on a solid LB medium at 28 degrees Celsius for 48 hours. Then select a single clone of strain K599 and culture it in one milliliter of liquid antibiotic containing LB medium for 12 hours. Spread 500 microliters of the bacterial suspension evenly on a solid antibiotic containing LB medium and incubate at 28 degrees Celsius for 24 hours.After seven days, when seedling cotyledons are unfolded, use a sterilized sharp scalpel to cut approximately 0.5 to one centimeter of the hypocotyl. Discard the primary root and a portion of the hypocotyl. Coat the hypocotyl incision with K599 bacteria.Plant seedlings in moist vermiculite and infect 30 plants of each species using A.rhizogenes-mediated hairy root transformation. Then water the plants with five milliliters of resuspended K599 bacterial suspension in quarter-strength Gamborg B5 basic medium. Cover the pots with a transparent plastic bag and place them in a growth chamber.Grow the plants for approximately 12 days post-inoculation. At this time, new hairy roots should be generated at the incision site, typically reaching lengths of two to five centimeters. Using a CAMI luminescence imaging system with green excitation light at 540 nanometers and emission at 600 nanometers, detect the expression of the reporter gene DsRed2.Roots of composite plants of wild soybean, S.Americanum, and pumpkin under natural and green excitation light are visualized.