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

一步法毛状根转化方法推进根相关生物学

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.

作者聚焦：通过根瘤农杆菌介导的毛状根转化简化复合植物生产 

一种基于根 茎农杆菌毛根转化生产复合植物的高效且可重复的方法

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  

基于 根茎农杆菌毛根转化生产复合植物

首先收集野生大豆，南美南瓜和当地南瓜品种的种子。将种子播种在一厘米深的蛭石中，并彻底浇水。在相对湿度约为70%的生长室中培养它们。从 80 摄氏度的冰箱中取出根茎菌株 K599，并在 28 摄氏度的固体 LB 培养基上激活 48 小时。然后选择菌株K599的单个克隆，并将其在一毫升含有LB培养基的液体抗生素中培养12小时。将500微升细菌悬浮液均匀地散布在含有LB培养基的固体抗生素上，并在28摄氏度下孵育24小时。七天后，当幼苗子叶展开时，使用消毒的锋利手术刀切割约0.5至1厘米的下胚轴。丢弃主根和下胚轴的一部分。用K599细菌涂覆下胚轴切口。在潮湿的蛭石中种植幼苗，并使用根茎介导的毛根转化感染每个物种的 30 株植物。然后在四分之一强度的Gamborg B5碱性培养基中用五毫升重悬的K599细菌悬浮液浇灌植物。用透明塑料袋盖住花盆，并将它们放入生长室中。接种后种植植物约12天。此时，应在切口部位产生新的毛根，通常达到两到五厘米的长度。使用具有540纳米绿色激发光和600纳米发射的CAMI发光成像系统，检测报告基因DsRed2的表达。野生大豆、南美和南瓜复合植物在自然和绿色激发光下的根系可视化。

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

Research

JoVE Journal

Biology

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

536 次观看.  Liaocheng University. 首先收集野生大豆，南美南瓜和当地南瓜品种的种子。将种子播种在一厘米深的蛭石中，并彻底浇水。在相对湿度约为70%的生长室中培养它们。从 80 摄氏度的冰箱中取出根茎菌株 K599，并在 28 摄氏度的固体 LB 培养基上激活 48 小时。然后选择菌株K599的单个克隆，并将其在一毫升含有LB培养基的液体抗生素中培养12小时。将500微升细菌悬浮液均匀地散布在含有LB培养基的固...

视频: 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 ...

科研

生物学

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.