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Physiological Mechanism of Drought-Resistant Rice Coping With Drought Stress

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A Correction to this article was published on 24 November 2021

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Abstract

Drought stress is one of the major threats to rice production. The weakening of leaf photosynthesis due to drought is the main reason for the reduction of grain yield, but its mechanism is still obscure. The objectives of this study were to reveal the physiological mechanism of drought stress affecting photosynthetic capacity and grain yield. Pot experiments were conducted with drought-tolerant cultivars Hanyou113 (HY113) and Zhonghan3 (ZH3) and drought-sensitive cultivar Huanghuazhan (HHZ) under four water management treatments (traditional flooding (CK), mild drought stress (LD), moderate drought stress (MD) and severe drought stress (HD)) at heading stage in 2013 and 2014. Compared with CK, grain yield was significantly reduced by 14.9%, 30.8%, and 12.8% in HY113, HHZ, and ZH3 under LD, 32.9%, 33.7%, and 22.9% in HY113, HHZ and ZH3 under MD and 53.6%, 45.6%, and 30.7% in HY113, HHZ, and ZH3 under HD, respectively. The photosynthetic rate (Pn) decreased by 49.0% from 20.0 to 10.2 µmol m−2 s−1 in HY113, and 67.6% from 23.4 to 7.58 µmol m−2 s−1 in HHZ, and 39.3% from 23.4 to 14.2 µmol m−2 s−1 in ZH3 under HD. The Pn of HHZ was similar to that of ZH3 under CK conditions. During the drought periods from LD to HD at heading stage, the leaf water potential (LWP) reduced 31.9%, 54.8%, and 15.7% in HY113, HHZ, and ZH3, respectively. The non-photochemical quenching (NPQ) of HY113, HHZ, and ZH3 flag leaves increased by 150%, 97.6%, and 218%, respectively. The effective quantum yield of PSII photochemistry (ΦPSII) of flag leaves reduced by 20.3%, 11.9%, and 22.1% in HY113, HHZ, and ZH3, respectively. The enzymatic activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) increased by 11.4%, 18.0%, and 21.8% in HY113, and 13.2%, 14.3%, and 30.9% in HHZ, and 13.4% 21.7%, and 17.6% in ZH3 under MD on average across two seasons. The yield reduction of drought-resistant cultivars (HY113, ZH3) was smaller than that of conventional cultivars (HHZ). Maintaining leaf water potential (LWP), Pn, photosystem II (PSII) original light energy conversion efficiency, non–photochemical quenching coefficient (NPQ), and increasing in the ratio of photochemical reaction energy in fluorescence and antioxidant enzyme activity is the physiological basis to achieve a relatively high photosynthesis. These traits could be the target for breeder to develop drought-tolerant varieties.

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All data supporting the conclusions of this manuscript are provided within the manuscript.

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Acknowledgement

Thanks to Jianping Cheng for work in the revising the manuscript of language.

Funding

This work was supported by National Natural Science Foundation of China (31801291) and the State Key Special Program (2017YFD0301400).

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CC and PL conceived the experiments. XY, LC, HB and YJ conducted the experiments and collected the data. BW and YJ analyzed the data and BW wrote the manuscript. All authors revised the manuscript.

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Correspondence to Cougui Cao.

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The authors declare that they have no competing interests.

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Handling Editor: Mikihisa Umehara.

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The original online version of this article was revised: Dr. Jianping Cheng was included incorrectly as a co-author.

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Wang, B., Yang, X., Chen, L. et al. Physiological Mechanism of Drought-Resistant Rice Coping With Drought Stress. J Plant Growth Regul 41, 2638–2651 (2022). https://doi.org/10.1007/s00344-021-10456-6

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  • DOI: https://doi.org/10.1007/s00344-021-10456-6

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