Liu Yang, Zhu Qi, Li Rongkai, Wei Renyuan, Geng Xiaoyu, Zhang Xiang, Wei Huanhe, Gao Pinglei, Xu Ke, Dai Qigen, Chen Yinglong
Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Key Laboratory of Saline-Alkali Soil Reclamation and Utilization in Coastal Areas, The Ministry of Agriculture and Rural Affairs of China/Research Institute of Rice Industrial Engineering Technology, Yangzhou University, Yangzhou, China.
Front Plant Sci. 2025 Jun 16;16:1578023. doi: 10.3389/fpls.2025.1578023. eCollection 2025.
How to increase crop yield in coastal saline-alkali land has become a focus and hot topic of concern for researchers.
Field experiments were conducted to identify whether foliar application of magnesium sulfate (MgSO·7HO) can enhance rice salt tolerance and improve rice yield. Treatments with four concentrations of MgSO·7HO (10 g L, 20 g L, 30 g L, and 40 g L) were applied during the jointing and heading stages of rice in three fields with different salt levels in Yancheng City, Jiangsu Province, China in 2022 and 2023.
Results showed that the application of magnesium sulfate, even the lowest concentration of MgSO, could significantly increase the rice yield and total biomass under all the three salt treatments, while the increase displayed more obvious under higher salt treatment. Magnesium sulfate treatment enhanced the Rubisco enzyme activity and total chlorophyll content in rice flag leaves, delayed leaf tip wilt, and thus improved the photosynthetic capacity of rice. Additionally, magnesium sulfate treatment significantly reduced the accumulation of toxic sodium ions (Na) in rice compared to the untreated control, accompanied with notable enhancement of Mg/Na, K/Na, P/Na, and Ca/Na.
This study found that magnesium sulfate could enhance the salt tolerance of rice in coastal saline-alkali soils, whereas the effects vary significantly among different concentrations. Under 20 g L¹ of MgSO treatment, rice leaves exhibited the highest net photosynthetic rate and total chlorophyll content, while the incidence of leaf tip wilt and the accumulation of toxic sodium ions (Na) were minimized, resulting in the highest yield and total biomass. Therefore, 20 g L¹ of MgSO is likely to be recommended as the optimal application concentration in saline-alkali areas.
如何提高滨海盐碱地的作物产量已成为研究人员关注的焦点和热点话题。
进行田间试验，以确定叶面喷施硫酸镁（MgSO₄·7H₂O）是否能增强水稻耐盐性并提高水稻产量。2022年和2023年在中国江苏省盐城市三个不同盐度水平的田块中，于水稻拔节期和抽穗期分别喷施四种浓度（10 g/L、20 g/L、30 g/L和40 g/L）的MgSO₄·7H₂O进行处理。
结果表明，喷施硫酸镁，即使是最低浓度的MgSO₄，在所有三种盐处理下均能显著提高水稻产量和总生物量，且在较高盐处理下增幅更明显。硫酸镁处理提高了水稻剑叶的Rubisco酶活性和总叶绿素含量，延缓了叶尖枯萎，从而提高了水稻的光合能力。此外，与未处理的对照相比，硫酸镁处理显著降低了水稻中有毒钠离子（Na⁺）的积累，同时显著提高了Mg/Na、K/Na、P/Na和Ca/Na。
本研究发现硫酸镁可增强滨海盐碱土水稻的耐盐性，不同浓度的效果差异显著。在20 g/L的MgSO₄处理下，水稻叶片净光合速率和总叶绿素含量最高，叶尖枯萎发生率和有毒钠离子（Na⁺）积累量最小，产量和总生物量最高。因此，20 g/L的MgSO₄可能被推荐为盐碱地的最佳施用浓度。
