Агробактериальной вирус-индуцированного Пробирной Отключение гена В Хлопок
Summary
Мы представляем подробный протокол для агробактериальной вирус-индуцированных генов (VIGS) анализа в хлопка. Вирус табачной погремушкой (ТРВ)-производные векторов VIGS были развернуты, чтобы побудить глушителей РНК хлопка GrCLA1, Cloroplastos alterados один ген. Альбиноса фенотип вызванных глушителей GrCLA1 наблюдался на всходов в течение 2 недель после прививки.
Abstract
Cotton (Gossypium hirsutum) is one of the most important crops worldwide. Considerable efforts have been made on molecular breeding of new varieties. The large-scale gene functional analysis in cotton has been lagged behind most of the modern plant species, likely due to its large size of genome, gene duplication and polyploidy, long growth cycle and recalcitrance to genetic transformation1. To facilitate high throughput functional genetic/genomic study in cotton, we attempt to develop rapid and efficient transient assays to assess cotton gene functions.
Virus-Induced Gene Silencing (VIGS) is a powerful technique that was developed based on the host Post-Transcriptional Gene Silencing (PTGS) to repress viral proliferation2,3. Agrobacterium-mediated VIGS has been successfully applied in a wide range of dicots species such as Solanaceae, Arabidopsis and legume species, and monocots species including barley, wheat and maize, for various functional genomic studies3,4. As this rapid and efficient approach avoids plant transformation and overcomes functional redundancy, it is particularly attractive and suitable for functional genomic study in crop species like cotton not amenable for transformation.
In this study, we report the detailed protocol of Agrobacterium-mediated VIGS system in cotton. Among the several viral VIGS vectors, the tobacco rattle virus (TRV) invades a wide range of hosts and is able to spread vigorously throughout the entire plant yet produce mild symptoms on the hosts5. To monitor the silencing efficiency, GrCLA1, a homolog gene of Arabidopsis Cloroplastos alterados 1 gene (AtCLA1) in cotton, has been cloned and inserted into the VIGS binary vector pYL156. CLA1 gene is involved in chloroplast development6, and previous studies have shown that loss-of-function of AtCLA1 resulted in an albino phenotype on true leaves7, providing an excellent visual marker for silencing efficiency. At approximately two weeks post Agrobacterium infiltration, the albino phenotype started to appear on the true leaves, with 100% silencing efficiency in all replicated experiments. The silencing of endogenous gene expression was also confirmed by RT-PCR analysis. Significantly, silencing could potently occur in all the cultivars we tested, including various commercially grown varieties in Texas. This rapid and efficient Agrobacterium-mediated VIGS assay provides a very powerful tool for rapid large-scale analysis of gene functions at genome-wide level in cotton.
Protocol
Discussion
VIGS был доказан, чтобы быть мощным инструментом в области функциональной геномики анализа временно сбить экспрессии эндогенных генов. В этом исследовании, мы разработали агробактериальной VIGS за счет использования TRV основе двоичного вектора. Хлопок CLA1 (GrCLA1) ген был разработан как ?…
Divulgazioni
The authors have nothing to disclose.
Acknowledgements
Мы благодарим доктора. SP-Динеш Кумар и Юла Лю для ТРВ-VIGS векторов, и д-ра. Чак Kenerley, Терри Уилер, Джим Старр и Bayer CropScience за предоставление семян хлопчатника. Эта работа финансировалась NSF для LS и NIH для PH
Materials
| Name of the reagents and equipments | Company | Catalogue/serial number | Comments |
|---|---|---|---|
| Roller drum | Glas-Col, LLC. | 099A TC108 | Agro-bacterium culture |
| Incubator | Sheldon Manufacturing, Inc. | 01046209 | Agro-bacterium culture |
| UV/Vis spectrophotometer | Beckman Coulter | Model: DU530 | Measuring OD |
| Gene Pulser | BioRad | Model: 1652076; Serial: 154BR3880 | Electroporation |
| Pulser Controller | BioRad | Model: 1652098; Serial: 232BR4833 | Electroporation |
| Micropulser Electroporation cuvette | BioRad | 165-2081 | Electroporation |
| 1 ml Syringe | BD Biosciences | 30962 | Inoculation of agro-bacterium |
| Metro Mix 700 | SUNGR | SKU# 553001 | Growing seedling |
| Terra Cotta pot | T.O.Plastics | GPS 3001B2 | Growing seedling |
| MES monohydrate | USB | 18886 | Infiltration buffer |
| Acetosyringone | Sigma | D134406 | Infiltration buffer |
Riferimenti
- Chen, Z. J., Scheffler, B. E., Dennis, E., Triplett, B. A., Zhang, T., Guo, W. Toward sequencing cotton (Gossypium) genomes. Plant Physiol. 145, 1303-1310 (2007).
- Dinesh-Kumar, S. P., Anandalakshmi, R., Marathe, R., Schiff, M., Liu, Y. Virus-induced gene silencing. Methods Mol Biol. 236, 287-294 (2003).
- Hamilton, A. J., Baulcombe, D. C. A species of small antisense RNA in posttranscriptional gene silencing in plants. Science. 286, 950-952 (1999).
- Burch-Smith, T. M., Anderson, J. C., Martin, G. B., Dinesh-Kumar, S. P. Applications and advantages of virus-induced gene silencing for gene function studies in plants. Plant J. 39, 734-746 (2004).
- Liu, Y., Schiff, M., Dinesh-Kumar, S. P. Virus-induced gene silencing in tomato. Plant J. 31, 777-786 (2002).
- Estevez, J. M., Cantero, A., Romero, C., Kawaide, H., Jimenez, L. F., Kuzuyama, T. Analysis of the expression of CLA1, a gene that encodes the 1-deoxyxylulose 5-phosphate synthase of the 2-C-methyl-D-erythritol-4-phosphate pathway in Arabidopsis. Plant Physiol. 124, 95-104 (2000).
- Mandel, M. A., Feldmann, K. A., Herrera-Estrella, L., Rocha-Sosa, M., Leon, P. CLA1, a novel gene required for chloroplast development, is highly conserved in evolution. Plant J. 9, 649-658 (1996).
- Gao, X., Wheeler, T., Li, Z., Kenerley, C., He, P., Shan, L. Silencing GhNDR1 and GhMKK2 compromised cotton resistance to Verticillium wilt. Plant J. 66, 293-305 (2011).
