Dang Kun, Tian Hao, Bai Jingjing, Fu Pengcheng, Cui Jiehao, Ji Dongming, Shao Xiwen, Geng Yanqiu, Zhang Qiang, Guo Liying
College of Agriculture, Jilin Agricultural University, Changchun, China.
Siping Agricultural Technology Extension Station, Siping, China.
Front Plant Sci. 2025 Aug 14;16:1616333. doi: 10.3389/fpls.2025.1616333. eCollection 2025.
Saline-sodic stress not only impacts the absorption of nutrient ions, such as Zn, in rice but also induces physiological water shortages and ion toxicity in rice plants, significantly hindering their growth. To investigate this phenomenon, the present study utilized two rice varieties, 'Changbai 9' and 'Tonghe 899', as test subjects to simulate conditions of saline-sodic soil stress. Four-week-old rice seeds under four treatments: control (CT), 2 μmol L zinc treatment alone (Z), 50 mmol L saline-sodic treatment (S), and 50 mmol L saline-sodic treatment with 2 μmol L zinc (Z+S). The study aimed to examine the effect of zinc on water transport in rice plants under conditions of saline-sodic stress. Research indicates that the application of zinc positively influences the growth of rice under saline-sodic stress.The application of zinc not only reduces the Na/K ratio and malondialdehyde (MDA) content, but also increases the levels of Zn, Cu, and other ions. Additionally, it enhances the expression of aquaporins in the plasma membrane of rice roots, which in turn increases the hydraulic conductance of the roots and ultimately improves the water absorption capacity of the root system under stress conditions. Additionally, zinc application promotes auxin (IAA) synthesis, facilitating root growth and expanding the root absorption area, which in turn enhances the water absorption rate and helps maintain higher leaf water content. Moreover, zinc application regulates stomatal conductance through an increase in potassium ion concentration and abscisic acid (ABA) content, thereby elevating the transpiration rate of rice leaves and promoting water absorption and transportation within the rice plants. Therefore, the addition of zinc under saline-sodic stress not only alleviates the effects of such stress but also enhances water absorption and transportation in rice plants. This results in a higher water content within the plants, positively influencing their growth and development under saline-sodic conditions.
盐碱胁迫不仅影响水稻对锌等营养离子的吸收，还会导致水稻植株出现生理缺水和离子毒害，严重阻碍其生长。为了研究这一现象，本研究以两个水稻品种“长白9号”和“通禾899”为试验对象，模拟盐碱土胁迫条件。对四周龄的水稻种子进行四种处理：对照（CT）、单独2 μmol L锌处理（Z）、50 mmol L盐碱处理（S）以及50 mmol L盐碱处理加2 μmol L锌（Z+S）。该研究旨在考察锌对盐碱胁迫条件下水稻植株水分运输的影响。研究表明，锌的施用对盐碱胁迫下水稻的生长有积极影响。锌的施用不仅降低了钠/钾比和丙二醛（MDA）含量，还提高了锌、铜等离子的水平。此外，它增强了水稻根细胞质膜上水通道蛋白的表达，进而增加了根的水力导度，最终提高了胁迫条件下根系的吸水能力。此外，施用锌促进生长素（IAA）合成，促进根系生长并扩大根系吸收面积，进而提高吸水速率并有助于维持较高的叶片含水量。此外，施用锌通过增加钾离子浓度和脱落酸（ABA）含量来调节气孔导度，从而提高水稻叶片的蒸腾速率，促进水稻植株体内的水分吸收和运输。因此，在盐碱胁迫下添加锌不仅减轻了这种胁迫的影响，还增强了水稻植株的水分吸收和运输。这导致植株体内含水量更高，对其在盐碱条件下的生长发育产生积极影响。
