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Photosynthetic resistance and resilience under drought, flooding and rewatering in maize plants

Abstract

Abnormally altered precipitation patterns induced by climate change have profound global effects on crop production. However, the plant functional responses to various precipitation regimes remain unclear. Here, greenhouse and field experiments were conducted to determine how maize plant functional traits respond to drought, flooding and rewatering. Drought and flooding hampered photosynthetic capacity, particularly when severe and/or prolonged. Most photosynthetic traits recovered after rewatering, with few compensatory responses. Rewatering often elicited high photosynthetic resilience in plants exposed to severe drought at the end of plant development, with the response strongly depending on the drought severity/duration. The associations of chlorophyll concentrations with photosynthetically functional activities were stronger during post-tasseling than pre-tasseling, implying an involvement of leaf age/senescence in responses to episodic drought and subsequent rewatering. Coordinated changes in chlorophyll content, gas exchange, fluorescence parameters (PSII quantum efficiency and photochemical/non-photochemical radiative energy dissipation) possibly contributed to the enhanced drought resistance and resilience and suggested a possible regulative trade-off. These findings provide fundamental insights into how plants regulate their functional traits to deal with sporadic alterations in precipitation. Breeding and management of plants with high resistance and resilience traits could help crop production under future climate change.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors are grateful to Yuhui Wang, Bingrui Jia, Yanling Jiang and Jian Song for their help during the study. The authors are also grateful to Hongying Yu, Quanhui Ma and Lang Li for their loyal assistances during the two experiments.

Funding

This study was jointly funded by National Key Research and Development Program of China (2016YFD0300106), China Special Fund for Meteorological Research in the Public Interest (GYHY201506001-3) and National Natural Science Foundation of China (31661143028).

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ZX and GZ deceived and designed the study; MQ, XL, YL, HS and FZ conducted the experiment works. MQ, XL, ZY, YL, QH and ZX performed the data analyses. All authors wrote and proofread the manuscript.

Corresponding authors

Correspondence to Zhenzhu Xu or Guangsheng Zhou.

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Qi, M., Liu, X., Li, Y. et al. Photosynthetic resistance and resilience under drought, flooding and rewatering in maize plants. Photosynth Res 148, 1–15 (2021). https://doi.org/10.1007/s11120-021-00825-3

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  • DOI: https://doi.org/10.1007/s11120-021-00825-3

Keywords

  • Drought
  • Fluorescence
  • Photosynthetic capacity
  • Rewatering
  • Resistance
  • Resilience
  • Zea mays L.