OsWRKY114 Negatively Regulates Drought Tolerance by Restricting Stomatal Closure in Rice

The WRKY family of transcription factors plays a pivotal role in plant responses to biotic and abiotic stress. The WRKY Group III transcription factor OsWRKY114 is a positive regulator of innate immunity against Xanthomonas oryzae pv. oryzae; however, its role in abiotic stress responses is largely...

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Published in:Plants (Basel) 2022-07, Vol.11 (15), p.1938
Main Authors: Song, Giha, Son, Seungmin, Lee, Kyong Sil, Park, Yeo Jin, Suh, Eun Jung, Lee, Soo In, Park, Sang Ryeol
Format: Article
Language:English
Subjects:
Abiotic stress
Abscisic acid
Carotenoids
Chitinase
Chlorophyll
Climate change
Communication
Drought
Drought resistance
Gene expression
Innate immunity
Kinases
OsWRKY114
Pathogens
PYR/PYL/RCAR
Rice
Signal transduction
Stomata
stomatal closure
Survival
Transcription factors
Transgenic plants
Water loss
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Summary:The WRKY family of transcription factors plays a pivotal role in plant responses to biotic and abiotic stress. The WRKY Group III transcription factor OsWRKY114 is a positive regulator of innate immunity against Xanthomonas oryzae pv. oryzae; however, its role in abiotic stress responses is largely unknown. In this study, we showed that the abundant OsWRKY114 transcripts present in transgenic rice plants are reduced under drought conditions. The overexpression of OsWRKY114 significantly increased drought sensitivity in rice, which resulted in a lower survival rate after drought stress. Moreover, we showed that stomatal closure, which is a strategy to save water under drought, is restricted in OsWRKY114-overexpressing plants compared with wild-type plants. The expression levels of PYR/PYL/RCAR genes, such as OsPYL2 and OsPYL10 that confer drought tolerance through stomatal closure, were also markedly lower in the OsWRKY114-overexpressing plants. Taken together, these results suggest that OsWRKY114 negatively regulates plant tolerance to drought stress via inhibition of stomatal closure, which would otherwise prevent water loss in rice.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants11151938