外源水杨酸对盐胁迫下棉花幼苗光合作用的影响  

Effects of Exogenous Salicylic Acid on the Photosynthesis of Cotton Seedlings Under Salt Stress

作　　者：王立红[1] 张巨松[1] 李星星[1] 阿曼古丽.买买提阿力 

机构地区：[1]新疆农业大学农学院/教育部棉花工程研究中心,新疆乌鲁木齐830052

出　　处：《核农学报》2016年第9期1864-1871,共8页Journal of Nuclear Agricultural Sciences

基　　金：国家"十二五"科技支撑项目(2014BAD11B02);新疆农业大学研究生科研创新项目(XJAUGRI2015019)

摘　　要：为了探究水杨酸(SA)对盐胁迫下棉花幼苗的缓解机理,以2个对盐胁迫敏感程度不同的棉花品种中棉所41号和中棉所49号为材料,研究SA浸种和叶面喷施对盐胁迫下棉花幼苗光合作用的影响。结果表明,0.05、0.06 mmol·L^(-1) SA浸种和0.08、0.12、0.18 mmol·L^(-1) SA叶面喷施均可提高棉花幼苗的株高、干物质积累、叶绿素含量、净光合速率、胞间CO_2浓度和气孔导度,能有效缓解0.6%NaCl的胁迫。中棉所41号在0.05 mmol·L^(-1)SA浸种处理和0.08 mmol·L^(-1) SA叶面喷施处理表现最好,中棉所49号在0.06 mmol·L^(-1) SA浸种处理和0.18 mmol·L^(-1) SA叶面喷施处理表现最好。主成分分析表明,单株鲜重、叶干重、净光合速率和气孔限制值可以作为评价不同浓度的SA对盐胁迫缓解效果的主要指标。综上所述,SA浸种与叶面喷施2种处理方式均可缓解0.6%NaCl带来的伤害,但存在浓度效应,适宜的浓度与棉花的基因型与耐盐性密切相关。本研究为进一步揭示外源SA对棉花盐胁迫的缓解机理提供了参考,同时也为新疆盐碱地棉花种植提供了理论依据。In order to study the mitigation mechanism of Salicylic Acid （SA） on the seedling stage of cotton under salt stress, two salt-tolerant varieties of Zhongmiansuo 41 and Zhongmiansuo 49 were regarded as materials, to investigate the effects of SA soaking seeds and foliage application on photosynthesis of cotton seedlings in this study. The results indicated that. the SA of 0.05, 0.06 mmol· L^-1 for soaking seeds and 0.08, 0.12, 0. 18 mmol· L^-1 for foliar application can improve the plant height, dry matter accumulation, chlorophyll content, net photosynthetic rate and stomatal conductance, intercellular CO2 concentration, also can effectively alleviate the stress of 0.6% NaC1. Zhongmiansuo 41 presented best in 0.05 mmol· L^-1 for soaking seeds and 0.08 mmol· L^-1 for foliar treatment while Zhongmiansuo 49 was at best level when it was in 0.06 mmol· L^-1 for soaking and 0. 18 mmol· L^-1for foliar treatment. According to principal components analysis, the main indexes of the effect of salt stress relief were the fresh weight per plant, dry weight, net photosynthetic rate and stomatal limit of the SA, which can be used for evaluating the effect of salt stress alleviation. In summary, SA soaking seeds and foliar application can alleviate the damage by 0.6% NaCl, and both of them had concentration effect, appropriate concentration and cotton genotypes were closely related to salt resistance. This paper provides a reference basis, and theoretical basis for cotton cultivation for further research on revealling the exogenous SA of cotton salt stress relief mechanism in saline alkali soil in Xinjiang.

关 键 词：棉花 水杨酸 NACL 光合作用 

分 类 号：S562[农业科学—作物学]