Du Xiaole, Du Youwei, Feng Naijie, Zheng Dianfeng, Zhou Hang, Huo Jingxin
College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, China.
National Saline-tolerant Rice Technology Innovation Center, South China, Zhanjiang, China.
Front Plant Sci. 2024 Sep 19;15:1459121. doi: 10.3389/fpls.2024.1459121. eCollection 2024.
Salt stress severely inhibit plant growth and development. Uniconazole has been considered to significantly increase plant stress tolerance. However, the mechanism by which Uniconazole induces salt tolerance in rice seedlings and its impact on yield is still unclear.
In this study, the effects of exogenous Uniconazole on morphogenesis, physiological metabolism, and yield of rice seedlings under salt stress were analyzed using the salt-tolerant rice variety HD961 and the salt-sensitive rice variety 9311.
The results showed that salt stress significantly inhibited rice growth, disrupted the antioxidant system and pigment accumulation, and reduced photosynthesis, and yield. There were corresponding percent decreases of 13.0% and 24.1% in plant height, 31.6% and 55.8% in leaf area, 65.7% and 85.3% in root volume, respectively for HD961 and 9311. spraying However, compared to salt stress, the US treatment increased the percentage to 4.7% and 139.0% in root volume, 7.5% and 38.0% in total chlorophyll, 4.5% and 14.3% in peroxidase (POD) of leaves, 14.4% and 54.2% in POD of roots, 18.7% and 22.7% in catalase (CAT) of leaves, and 22.6% and 53.9% in CAT of roots, respectively, for HD961 and 9311. In addition, it also significantly enhanced photosynthesis at the reproductive stage, promoted the transport of carbohydrate to grains. And US treatment significantly increased the percentage to 9.0% in panicle length, 28.0% in panicle number per hole, 24.0% in filled grain number, 3.0% in 1000-grain weight, and 26.0% in yield per plant, respectively, for HD961, compared to salt stress.
In summary, applying Uniconazole at the seedling stage can alleviate the damage induced by NaCl stress on rice by regulating the physiological metabolism of rice plants. This reduces the negative effects of salt stress, enhance salt tolerance, and boost rice production.
盐胁迫严重抑制植物生长发育。烯效唑被认为能显著提高植物的胁迫耐受性。然而，烯效唑诱导水稻幼苗耐盐性的机制及其对产量的影响仍不清楚。
本研究以耐盐水稻品种HD961和盐敏感水稻品种9311为材料，分析了外源烯效唑对盐胁迫下水稻幼苗形态发生、生理代谢及产量的影响。
结果表明，盐胁迫显著抑制水稻生长，破坏抗氧化系统和色素积累，降低光合作用和产量。HD961和9311的株高分别相应降低了13.0%和24.1%，叶面积分别降低了31.6%和55.8%，根体积分别降低了65.7%和85.3%。然而，与盐胁迫相比，烯效唑处理使HD961和9311的根体积分别增加到4.7%和139.0%，总叶绿素分别增加到7.5%和38.0%，叶片过氧化物酶（POD）分别增加到4.5%和14.3%，根POD分别增加到14.4%和54.2%，叶片过氧化氢酶（CAT）分别增加到18.7%和22.7%，根CAT分别增加到22.6%和53.9%。此外，它还显著增强了生殖阶段的光合作用，促进了碳水化合物向籽粒的运输。与盐胁迫相比，烯效唑处理使HD961的穗长增加到9.0%，每穴穗数增加到28.0%，实粒数增加到24.0%，千粒重增加到3.0%，单株产量增加到26.0%。
综上所述，在苗期施用烯效唑可以通过调节水稻植株的生理代谢来减轻NaCl胁迫对水稻的伤害。这减少了盐胁迫的负面影响，增强了耐盐性，提高了水稻产量。
