Journal
JOURNAL OF PLANT BIOLOGY
Volume 52, Issue 6, Pages 593-601Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s12374-009-9077-z
Keywords
Chilling stress; Chorispora bungeana; Cold acclimation; COR15 gene; Freezing stress; Transgenic tobacco
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Funding
- National Outstanding Youth Foundation of China [30625008]
- National High Technology Research and Development Program (863 Program) [2007AA021401]
- National Basic Research Program of China (973 Program) [2007CB108902]
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Rapid amplification of cDNA ends was performed to isolate cold-regulated CbCOR15 (EF208112) from Chorispora bungeana. This alpine species is distributed in subnival areas. Transcripts were detected in the leaves, but not the roots, of plants acclimated to cold temperatures. Expression was induced at high levels at both 4A degrees C and -4A degrees C. In comparing its deduced protein sequence to that of AtCOR15a (cold-regulated 15a in Arabidopsis thaliana), the N terminus had less homology than the C terminus while still containing a region analogous to the chloroplast-targeted signal peptide of AtCOR15a. We also introduced CbCOR15, with the CaMV 35S promoter, into tobacco. Second-generation (T1) plants had significantly increased tolerance to chilling, as determined by their electrolyte leakage, chlorophyll content, and relative water content. Further freezing-stress experiments showed that the tolerance of transgenic lines was significantly greater than that of the nontransgenics. Although the degree of chilling and freezing tolerance in the transgenic plants was not directly correlated with the accumulated levels of CbCOR15, we could conclude that this gene confers cold tolerance.
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