Overexpression of a maize dehydrin gene, <Emphasis Type="Italic">ZmDHN2b</Emphasis>, in tobacco enhances tolerance to low temperature |
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Authors: | Xin Xing Yukun Liu Xiangpei Kong Yang Liu Dequan Li |
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Institution: | (1) State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, 61 DaiZong Street, 271018 Tai’an, Shandong, China; |
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Abstract: | Dehydrins, a subfamily of group 2 LEA proteins, are intrinsically unstructured plant proteins that accumulate in the late
stages of seed development and in vegetative tissues subjected to water deficit, salinity, low temperature, or abscisic acid
treatment. In this study, we isolated and characterized ZmDHN2b, a maize dehydrin gene. The genomic organization of the ZmDHN2b gene and its expression in maize seedlings were analyzed. To investigate the function of ZmDHN2b, we generated transgenic tobacco plants constitutively overexpressing ZmDHN2b. Ectopic expression of ZmDHN2b in tobacco accelerated seed germination and seedling growth at 15°C. Furthermore, ZmDHN2b-overexpressing lines had lower levels of cold-induced malondialdehyde and less electrolyte leakage than wild-type tobacco
at 4°C. These results demonstrated that ZmDHN2b was involved in plant responses to low temperature. |
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