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以陆地棉鲁棉研17和鲁棉研28为材料,以无盐正常供水为对照,研究了在盐渍、涝渍和盐涝复合胁迫14d后棉苗干物质积累、叶片光合速率、叶绿素荧光参数和叶绿素含量等的变化。结果表明,盐渍、涝渍和盐涝复合胁迫都显著影响两个品种的光合速率和干物质积累。盐渍对棉苗的影响程度小于涝渍,而涝渍又小于盐涝复合胁迫,盐涝双重胁迫对棉苗生长和干物质积累的抑制表现出累加效应。盐渍胁迫下叶绿素含量的下降是光合作用受抑制的重要原因,而涝渍和盐涝胁迫下光合速率下降可能是叶绿体结构和PSⅡ稳定性的下降引起的。
The results showed that the dry matter accumulation, leaf photosynthetic rate, chlorophyll fluorescence and chlorophyll fluorescence of cotton seedling after combined treatment of salinity, waterlogging and saline-waterlogging for 14 days, Parameters and chlorophyll content and other changes. The results showed that the combination of salt, waterlogging and salt waterlogging all significantly affected the photosynthetic rate and dry matter accumulation of the two cultivars. The effect of salinity on cotton seedlings was less than that of waterlogging, but the waterlogging was less than that of salt waterlogging. The dual stress of salt and waterlogging showed additive effect on the growth of cotton seedlings and the inhibition of dry matter accumulation. The decrease of chlorophyll content under salt stress is one of the important reasons for inhibition of photosynthesis. The decrease of photosynthetic rate under waterlogging and waterlogging stress may be caused by the decrease of chloroplast structure and PS Ⅱ stability.