SA浸种对NaCl胁迫下棉花幼苗生长及光合特性的影响  

Effects of soaking seeds with salicylic acid on cotton seedling growth and photosynthetic characteristics under salt stress

作　　者：王立红[1] 李星星[1] 孙影影 阿曼古丽.买买提阿力 拉扎提.努尔布拉提 张巨松[1] 

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：《干旱地区农业研究》2017年第2期114-120,共7页Agricultural Research in the Arid Areas

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：研究水杨酸(SA)浸种对盐胁迫下棉花幼苗光合特性的影响,以2个对盐胁迫敏感程度不同的"中棉所41号(耐盐品种)"和"中棉所49号(中等耐盐品种)"棉花品种为试验材料,采用盆栽培养法,研究不同浓度SA浸种对NaCl胁迫下棉花幼苗生长、光合及叶绿素荧光动力学的影响。结果显示:(1)0.80%NaCl致使两棉花品种的株高、叶面积、干物质积累量、叶绿素含量以及净光合速率下降,且叶片的PSII反应中心和受体侧受到伤害,其中中棉所41号的净光合速率比未用NaCl处理的降低17.19%,中棉所49号的降低19.46%。(2)SA浸种处理可以减缓盐胁迫对棉花的伤害,促进植株生长,有效地调节光合结构和气孔开度,促进光合色素的积累。(3)SA能引发棉花的自我抵御盐胁迫机制,0.80%NaCl胁迫下,0.05 mmol·L^(-1)SA的缓解效果优于0.10 mmol·L^(-1)SA处理。0.05 mmol·L^(-1)SA浸种对棉花盐胁迫的幼苗生长有促进作用,从而抵御盐胁迫逆境的伤害。To study the effect of soaking seeds with salicylic acid(SA) on cotton seedling 's photosynthetic characteristics under salt stress,'Zhongmiansuo 41(salt tolerance variety) 'and 'Zhongmiansuo 49(less salt tolerance variety) 'was used in the pot experiment. Cotton seedling's growth,photosynthesis and chlorophyll fluorescence dynamics under NaCl stress were measured. The result was as follows:(1) For 0. 80% NaCl,plant height,leaf area,dry weight,chlorophyll content and net photosynthesis rate were decreased,and leaf PSII reaction center and the acceptor were injured. Compared with no NaCl,net photosynthetic rate of Zhongmiansuo 41 was decreased by 17. 19% and Zhongmiansuo49 decreased by 19. 46%.(2) Seed SA soaking slowed down the salty stress injury and was helpful for plant growth,photosynthesis structure and stomata opening,and could promote the photosynthesis pigment accumulation as well.(3) SA could initiate the self-resistance against salt stress of cotton seedlings and the effect of 0. 05 mmol·L^(-1)SA was better than 0. 10 mmol·L^(-1),indicating that seed soaking with 0. 05 mmol·L^(-1)SA could promote the growth and resist the damage caused by salt stress.

关 键 词：水杨酸(SA)浸种 NACL胁迫 棉花幼苗 植株生长 光合色素 叶绿素荧光动力学 

分 类 号：S562[农业科学—作物学] S503.4