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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。
The effects of salicylic acid (SA) soaking on the photosynthetic characteristics of cotton seedlings under salt stress were studied. Two cotton cultivars, Zhongmiansuo No.41 (salt tolerant cultivar) and Zhongmiansuo 49 (Medium salt tolerant variety) and cotton variety (cotton variety) as test materials, the pot culture method was used to study the effects of SA seed soaking with different concentrations on the growth, photosynthesis and chlorophyll fluorescence kinetics of cotton seedlings under NaCl stress. The results showed that: (1) 0.80% NaCl caused plant height, leaf area, dry matter accumulation, chlorophyll content and net photosynthetic rate of two cotton cultivars decreased, and PSII reaction center and receptor side of the leaves were harmed, The net photosynthetic rate of No. 41 was 17.19% lower than that without NaCl treatment, and 19.46% lower than that of No. 49 of CCCC. (2) SA soaking treatment can slow down the salt stress on cotton injury, promote plant growth, effectively regulate the photosynthetic structure and stomatal opening, and promote photosynthetic pigment accumulation. (3) SA can induce cotton self-defense against salt stress mechanism. Under 0.80% NaCl stress, 0.05 mmol·L -1 SA alleviated better than 0.10 mmol·L -1 SA treatment. 0.05 mmol·L -1 SA could promote the seedling growth under salt stress and thus resist the damage of salt stress.