Guangdong Ocean University, College of Coastal Agricultural Sciences, Zhanjiang, China.
South China, National Saline-tolerant Rice Technology Innovation Center, Zhanjiang, China.
PeerJ. 2023 Feb 6;11:e14804. doi: 10.7717/peerj.14804. eCollection 2023.
Salt stress affects crop quality and reduces crop yields, and growth regulators enhance salt tolerance of crop plants. In this report, we examined the effects of prohexadione-calcium (Pro-Ca) on improving rice ( L.) growth and tillering under salt stress. We found that NaCl stress inhibited the growth of two rice varieties and increased malondialdehyde (MDA) levels, electrolyte leakage, and the activities of the antioxidant enzymes. Foliar application of Pro-Ca reduced seedling height and increased stem base width and lodging resistance of rice. Further analyses showed that Pro-Ca application reduced MDA content, electrolyte leakage, and membrane damage in rice leaves under NaCl stress. Pro-Ca enhanced the net photosynthetic rate (), stomatal conductance (Gs), and intercellular CO concentration () of rice seedlings, while increasing the activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and ascorbic acid peroxidase (APX) at the tillering stage under salt stress. Overall, Pro-Ca improves salt tolerance of rice seedlings at the tillering stage by enhancing lodging resistance, reducing membrane damages, and enhancing photosynthesis and antioxidant capacities of rice seedlings.
盐胁迫会影响作物品质并降低作物产量，而生长调节剂则可增强作物的耐盐性。在本报告中，我们研究了钙调素（Pro-Ca）对盐胁迫下水稻（ L.）生长和分蘖的影响。结果表明，NaCl 胁迫抑制了两个水稻品种的生长并增加了丙二醛（MDA）含量、电解质渗透率以及抗氧化酶的活性。叶面喷施 Pro-Ca 降低了幼苗高度并增加了茎基部宽度和倒伏阻力。进一步的分析表明，Pro-Ca 应用降低了 NaCl 胁迫下水稻叶片中的 MDA 含量、电解质渗透率和膜损伤。Pro-Ca 增强了盐胁迫下水稻幼苗的净光合速率（）、气孔导度（Gs）和胞间 CO 浓度（），同时在分蘖期增加了超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、过氧化物酶（POD）和抗坏血酸过氧化物酶（APX）的活性。总体而言，Pro-Ca 通过增强抗倒伏能力、降低膜损伤以及增强光合作用和抗氧化能力来提高盐胁迫下水稻幼苗的耐盐性。
