Biologia plantarum 58:561-566, 2014 | DOI: 10.1007/s10535-014-0419-4
Chloroplast elongation factor BcEF-Tu responds to turnip mosaic virus infection and heat stress in non-heading Chinese cabbage
- 1 State Key Laboratory of Crop Genetics and Germplasm Enhancement/Key Laboratory of Biology and Genetic Improvement of Horticulture Crops in East China, Ministry of Agriculture/Nanjing Agricultural University, Nanjing, P.R. China
Eukaryotic elongation factor Tu has been implicated in responses to heat stress and viral infection. In this study, the turnip mosaic virus (TuMV)-response gene BcLRK01, which encodes a leucine-rich repeat receptor-like kinase, was probed using the cDNA library of TuMV-infected leaves of non-heading Chinese cabbage (Brassica campestris ssp. chinensis). The BcEF-Tu gene, which encodes chloroplast elongation factor Tu, was obtained and verified by a yeast two-hybrid system to interact with the BcLRK01 gene. TuMV infection depressed the expression of this gene, whereas a heat stress induced its expression. Overexpression of BcEF-Tu enhanced the viability of Escherichia coli transformants under the heat stress. These results demonstrate that elongation factor BcEF-Tu responded to the TuMV infection and heat stress. This is the first report on chloroplast EF-Tu in non-heading Chinese cabbage which provides a theoretical basis for the functional research of EF-Tu.
Keywords: Brassica campestris; chlorophyll fluorescence; heterologous expression; high temperature; real-time PCR; yeast two-hybrid system
Subjects: chloroplast elongation factor; temperature - high; virus infection; chlorophyll a fluorescence; yeast two-hybrid screening; gene expression; Chinese cabbage
Received: August 20, 2013; Revised: January 6, 2014; Accepted: January 29, 2014; Published: September 1, 2014 Show citation
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