解钾菌对盐胁迫下小麦种子萌发和幼苗生长的促进作用及其机制分析  

Promotion of Wheat Seed Germination and Seedling Growth under Salt Stress by KSB and Analysis of Its Mechanism

作　　者：王乙富 朱新开[1] Wang Yifu;Zhu Xinkai(Agricultural College,Yangzhou University,Yangzhou,225009)

机构地区：[1]扬州大学农学院,扬州225009

出　　处：《分子植物育种》2023年第17期5761-5767,共7页Molecular Plant Breeding

摘　　要：盐胁迫是限制农作物生长和产量的主要因素之一。本研究旨在探究解钾菌(potassium-solubilizing bacteria,KSB)对盐胁迫下小麦(Triticum aestivum L.)种子萌发和幼苗生长的促进作用及其机制。通过实验设计和数据分析,评估了不同浓度解钾菌对小麦种子萌发率、幼苗生长指标和生理特性的影响。结果显示,盐胁迫下,解钾菌处理显著提高了小麦种子的萌发率,促进了小麦幼苗的株高、鲜重、干重和可溶性蛋白含量的增加。光合作用活性和抗氧化能力在解钾菌处理组中显著提高,而过氧化物酶活性和丙二醛含量降低。叶片中Na+含量下降,K+含量上升,Na+/K+比值减少,改善了矿物质平衡和渗透调节。这些结果表明,解钾菌能够有效促进盐胁迫下小麦种子的萌发和幼苗生长,并通过调节光合作用、抗氧化能力和离子平衡等机制发挥作用。本研究结果对于开发盐碱地的农业生产和提高作物抗盐能力具有重要意义。Salt stress is a major limiting factor for crop growth and productivity.This study aimed to investigate the promotion of wheat(Triticum aestivum L.) seed germination and seedling growth under salt stress by potassiumsolubilizing bacteria(KSB) and elucidate the underlying mechanisms.Through experimental design and data analysis,we evaluated the effects of different concentrations of KSB on wheat seed germination rate,seedling growth parameters,and physiological characteristics.The results showed that under salt stress,KSB treatment significantly enhanced the seed germination rate and promoted the increase in plant height,fresh weight,dry weight,and soluble protein content of wheat seedlings.The photosynthetic activity and antioxidant capacity were significantly improved in the KSB-treated group,while the activities of peroxidase and the malondialdehyde content were reduced.The Na+content decreased,the K+content increased,and the Na+/K+ratio decreased in the leaves,indicating improved mineral balance and osmotic regulation.These results demonstrate that KSB effectively promotes wheat seed germination and seedling growth under salt stress and functions through the regulation of photosynthesis,antioxidant capacity,and ion balance mechanisms.The findings of this study are of great significance for the development of agriculture in saline-alkali soil and enhancement of salt tolerance in crops.

关 键 词：解钾菌 盐胁迫 小麦 种子萌发 幼苗生长 

分 类 号：S512.1[农业科学—作物学]