ArticleInternational journal of molecular sciences2022
Physiological Adaptation Mechanisms to Drought and Rewatering in Water-Saving and Drought-Resistant Rice.
Article in International journal of molecular sciences, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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6 citing papers in PubMed.
- Overexpression of theInternational journal of molecular sciences · 2026Article
- Balancing water efficiency and crop productivity: rhizosphere microbiome shifts in drought-resistant rice.World journal of microbiology & biotechnology · 2025Article
- Oxidative Stress in Rice (Plants (Basel, Switzerland) · 2025Review
- Characterization of Dark Septate Endophytes Under Drought and Rehydration and Their Compensatory Mechanisms inMicroorganisms · 2024Article
- OsWRKY70 Plays Opposite Roles in Blast Resistance and Cold Stress Tolerance in Rice.Rice (New York, N.Y.) · 2024Article
- Improving the prediction performance of leaf water content by coupling multi-source data with machine learning in rice (Oryza sativa L.).Plant methods · 2024Article
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Abstract
Water-saving and drought-resistant rice (WDR) has high a yield potential in drought. However, the photosynthetic adaptation mechanisms of WDR to drought and rehydration have yet to be conclusively determined. Hanyou 73 (HY73, WDR) and Huanghuazhan (HHZ, drought-sensitive cultivar) rice cultivars were subjected to drought stress and rewatering when the soil water potential was −180 KPa in the booting stage. The leaf physiological characteristics were dynamically determined at 0 KPa, −30 KPa, −70 KPa, −180 KPa, the first, the fifth, and the tenth day after rewatering. It was found that the maximum net photosynthetic rate (Amax) and light saturation point were decreased under drought conditions in both cultivars. The change in dark respiration rate (Rd) in HY73 was not significant, but was markedly different in HHZ. After rewatering, the photosynthetic parameters of HY73 completely returned to the initial state, while the indices in HHZ did not recover. The antioxidant enzyme activities and osmoregulatory substance levels increased with worsening drought conditions and decreased with rewatering duration. HY73 had higher peroxidase (POD) activity as well as proline levels, and lower catalase (CAT) activity, ascorbate peroxidase (APX) activity, malondialdehyde (MDA) level, and soluble protein (SP) content during all of the assessment periods compared with HHZ. In addition, Amax was markedly negatively correlated with superoxide dismutase (SOD), POD, CAT, and SP in HY73 (p < 0.001), while in HHZ, it was negatively correlated with SOD, CAT, APX, MDA, Pro, and SP, and positively correlated with Rd (p < 0.001). These results suggest that WDR has a more simplified adaptation mechanism to protect photosynthetic apparatus from damage in drought and rehydration compared with drought-sensitive cultivars. The high POD activity and great SP content would be considered as important physiological bases to maintain high photosynthetic production potential in WDR.
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