Overexpression of the Transcription Factor AP37 in Rice Improves Grain Yield under Drought Condition.pdf
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Overexpression of the Transcription Factor AP37 in Rice Improves Grain Yield under Drought Condition
Overexpression of the Transcription Factor AP37 in Rice
Improves Grain Yield under Drought Conditions1[W][OA]
Se-Jun Oh2,3, Youn Shic Kim2, Chang-Woo Kwon, Hye Kyong Park, Jin Seo Jeong, and Ju-Kon Kim*
School of Biotechnology and Environmental Engineering, Myongji University, Yongin 449–728, Korea
Transcription factors with an APETELA2 (AP2) domain have been implicated in various cellular processes involved in plant
development and stress responses. Of the 139 AP2 genes predicted in rice (Oryza sativa), we identified 42 genes in our current
study that are induced by one or more stress conditions, including drought, high salinity, low temperature, and abscisic acid.
Phylogenic analysis of these 42 stress-inducible AP2 genes revealed the presence of six subgroups (I–VI) with distinct signature
motifs. Two genes, AP37 and AP59, representing subgroups I and II, respectively, were functionally characterized. Both genes
were found to be induced upon 2 h of exposure to drought and high-salinity conditions but to differ in their expression profile
upon exposure to low temperature and abscisic acid. The overexpression of AP37 and AP59 in rice under the control of the
constitutive promoter OsCc1 increased the tolerance to drought and high salinity at the vegetative stage. Increased tolerance to
low temperatures was observed only in OsCc1:AP37 plants. More importantly, the OsCc1:AP37 plants showed significantly
enhanced drought tolerance in the field, which increased grain yield by 16% to 57% over controls under severe drought
conditions, yet exhibited no significant difference under normal growth conditions. In contrast, grain yield in OsCc1:AP59
plants in the field was reduced by 23% to 43% compared with controls under both normal and drought stress conditions.
Microarray experiments identified 10 and 38 genes that are up-regulated by AP37 and AP59, respectively, in addition to 37
genes that are commonly induced by both factors. Our results suggest that the AP37 gene has th
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