Synergistic effect of Si and K in improving the growth,ion distribution and partitioning of Lolium perenne L.under saline-alkali stress  

作　　者：FAN Yuan SHEN Wu-yan Pino VANESSA CHENG Fang-qin 

机构地区：[1]Institute of Resources and Environmental Engineering,Shanxi University/State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources,Taiyuan 030006,P.R.China [2]Sydney Institute of Agriculture,School of Life and Environmental Sciences,The University of Sydney,NSW 2006,Australia

出　　处：《Journal of Integrative Agriculture》2021年第6期1660-1673,共14页农业科学学报（英文版）

基　　金：the National Natural Science Foundation of China(31701369);the China Scholarship Council(201808140009);the Natural Science Foundation of Shanxi Province,China(201701D221218);the Bidding Project of Shanxi Province,China(20191101007)。

摘　　要：The application of Si or K has proven to be beneficial for the growth of plants under saline-alkali stress. However, the synergistic effect of Si and K in improving the growth, ion distribution, and partitioning in Lolium perenne L. under saline-alkali stress remains unclear. In this study, the growth characteristics and ion-selective absorption of ryegrass(Lolium perenne L.) exposed to different levels of saline-alkali stress were evaluated. The growth parameters of ryegrass were significantly improved when Si was applied by itself or coupled with K under low saline-alkali stress. Under a high saline-alkali level, only simultaneous application of Si and K could significantly improve the growth of ryegrass. When Si and K were applied together, the K^(+)/Na^(+) and Ca^(2+)/Na^(+) ratios in root, stem, and leaf of ryegrass were maximally improved as compared to the individual treatments and control. The K^(+) and Ca^(2+) concentrations in the vacuole, cell wall, and organelle of leaf were increased dramatically. This improvement was due to the ability of applied ions to compete with Na^(+), allowing the plant to maintain osmotic potential and leaf water content. The concentration of Na^(+) was significantly reduced when Si and K were applied and mainly concentrated in the soluble fraction and cell wall. The Si concentration in ryegrass increased markedly by the combined application of Si and K, and most of it was accumulated in the cell wall and soluble fraction, which could help in chlorophyll synthesis, reduce membrane injury, and increase water absorption under saline-alkali stress. This study emphasized the advantage of Si and/or K on the growth of plants under different saline-alkaline levels and provided a guide for the production of Si-K fertilizer and its application in saline-alkali soil.

关 键 词：saline-alkali stress SI K ryegrass plants K+/Na+ COMPARTMENTATION 

分 类 号：S543.6[农业科学—作物学]