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Rice histone deacetylase HDA704 positively regulates drought and salt tolerance by controlling stomatal aperture and density

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Abstract

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HDA704 enhances drought and salt tolerance via stomata-regulated mechanism. HDA704 negatively regulates stomatal aperture and density, repressing the transcription of DST and ABIL2 by histone deacetylation modification.

Abstract

Drought and salinity can damage crop growth and reduce yield. Stomata play an important role in abiotic stress tolerance. In this study on rice, we identified the RPD3/HDA1-type histone deacetylase HDA704 as a positive regulatory factor in drought and salt tolerance. HDA704 was induced by drought and salt stresses. Overexpression of HDA704 in transgenic rice promoted stomatal closure, decreased the number of stomata and slowed down the rate of water loss, consequently resulting in increased drought and salt tolerance. By contrast, knockdown of HDA704 in transgenic rice decreased stomatal closure and accelerated the rate of water loss, leading to decrease drought and salt tolerance. We detected the transcript expression of DST (Drought and Salt Tolerance) and ABIL2 (Abscisic Acid-insensitive Like2), which positively regulate stomatal aperture and density in rice. Our results showed that HDA704 directly binds to DST and ABIL2, repressing their expression via histone deacetylation modification. Collectively, these findings reveal that HDA704 positively regulates drought and salt tolerance by repressing the expression of DST and ABIL2. Our findings provide a new insight into the molecular mechanisms of stomata-regulated abiotic stress tolerance of plants.

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Abbreviations

ABIL2:

Abscisic acid-insensitive like2

CFP:

Cyan fluorescent protein

DST:

Drought and salt tolerance

EGFP:

Enhanced green fluorescent protein.

HDAC:

Histone deacetylase

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Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 31901521), the Natural Science Foundation of HuBei Province (Grant No. 2019CFB134), the China Postdoctoral Science Foundation Funded Project (Grant No. 216535) and the National Natural Science Foundation of China (U2004141).

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Correspondence to Xuncheng Liu or Jun Duan.

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The authors declare that they have no conflict of interest.

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All data generated or analysed during this study is included in this published article and its supplementary information files.

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Communicated by Dorothea Bartels.

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Zhao, J., Zhang, W., da Silva, J.A.T. et al. Rice histone deacetylase HDA704 positively regulates drought and salt tolerance by controlling stomatal aperture and density. Planta 254, 79 (2021). https://doi.org/10.1007/s00425-021-03729-7

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  • DOI: https://doi.org/10.1007/s00425-021-03729-7

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