Photosynthetic performance index (PIabs) and malondialdehyde (MDA) content determine rice biomass under combined salt stress and prohexadione-calcium treatment.

Journal: BMC plant biology
Published Date: Jul 2, 2025

Abstract

BACKGROUND: Plant growth regulators (PGRs) have proven effective in alleviating salt stress damage in crops, yet the predictive hierarchy of physiological traits governing biomass under combined salt-PGR regimes remains unclear. In this study, we applied random forest machine learning with variable importance measures to quantify the relative importance of key physiological traits - including photosynthetic rate (Pn), photosynthetic performance index (PIabs), electron transport rate (ETR), maximum photosystem II efficiency (Fv/Fm), superoxide dismutase (SOD) activity, and malondialdehyde (MDA) content- in rice subjected to NaCl (0.3%) and Prohexadione-Calcium (PCa) co-treatment. Using contrasting rice varieties (salt-sensitive 9311 and salt-tolerant Changmaogu), we measured physiological responses at 14 and 21 days after treatment (DAT).

Authors

  • Guanqiang Zuo
    College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, 524008, China.
  • Wanqi Mei
    College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, 524008, China.
  • Naijie Feng
    College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, 524008, China.
  • Dianfeng Zheng
    College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, 524008, China. zhengdf@gdou.edu.cn.

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