Zhang Rongjun, Zheng Dianfeng, Feng Naijie, Linfeng Linfeng, Ma Jinning, Yuan Xiayi, Huang Junyu, Huang Lisha
College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, Guangdong, China.
South China Center of National Saline-Tolerant Rice Technology Innovation Center, Zhanjiang, Guangdong, China.
PeerJ. 2024 Dec 27;12:e18357. doi: 10.7717/peerj.18357. eCollection 2024.
Soil salinization has resulted in a significant decrease in crop yields, particularly affecting the production of crops like rice ( L.). Prohexadione calcium (Pro-Ca) can enhance crop resilience against failure by managing plant height. However, its impact on various tiller positions during the tillering phase of rice under salt stress remains unknown. This study explores the distinct effects of salt stress on the physiological traits of the main stem and different tiller segments of rice plants, along with the role of Pro-Ca in mitigating salt stress. The findings revealed that under salt stress conditions, the number of tillers and leaves on the main stem decreased significantly in rice. Moreover, the levels of malondialdehyde (MDA) and HO in the leaves and stems of each tiller position notably increased. The percentage of tillers experiencing reduction or elevation was higher than that of the main stem compared to the respective control. Application of Pro-Ca through foliar spraying under NaCl stress effectively alleviated the impact of salt stress on the tiller growth of rice during the tillering phase. It also boosted the activities of antioxidant enzymes like superoxide dismutase (SOD) and peroxidase (POD) in the leaves and stems of the tillers. Furthermore, it successfully mitigated the damage inflicted by salt stress on the cell membrane of rice tillers during the tillering phase. The regulatory effect of calcium on cyclic acid was particularly pronounced in alleviating the impact on the tillers under salt stress conditions.
土壤盐碱化导致作物产量显著下降，尤其影响水稻（Oryza sativa L.）等作物的产量。调环酸钙（Pro-Ca）可以通过控制株高来增强作物抵御歉收的能力。然而，其在盐胁迫下水稻分蘖期对不同分蘖部位的影响尚不清楚。本研究探讨了盐胁迫对水稻植株主茎和不同分蘖节段生理特性的不同影响，以及Pro-Ca在缓解盐胁迫中的作用。研究结果表明，在盐胁迫条件下，水稻主茎上的分蘖数和叶片数显著减少。此外, 各分蘖部位叶片和茎中的丙二醛（MDA）和过氧化氢（H₂O₂）含量显著增加。与各自的对照相比，分蘖数减少或增加的比例高于主茎。在NaCl胁迫下通过叶面喷施Pro-Ca有效地减轻了盐胁迫对水稻分蘖期分蘖生长的影响。它还提高了分蘖叶片和茎中超氧化物歧化酶（SOD）和过氧化物酶（POD）等抗氧化酶的活性。此外，它成功减轻了盐胁迫对水稻分蘖期细胞膜造成的损伤。钙对环酸的调节作用在缓解盐胁迫条件下对分蘖的影响方面尤为明显。
