干旱胁迫下马铃薯品种‘克新1号’的光响应曲线

摘要

通过研究马铃薯抗旱品种‘克新1号’在干旱胁迫下光响应曲线的变化，在光合作用方面探讨‘克新1号’的抗旱机理。试验以两个抗旱性不同的品种‘克新l号’和‘大西洋’为试验材料，测定了两个品种在正常灌溉和干旱胁迫下各光和参数一光响应曲线。结果显示，干旱胁迫下，两个品种的叶片净光合速率、气孔导度及蒸腾速率均大幅度降低，但‘克新1号’叶片净光合速率高于‘大西洋’，在中强光下，‘克新1号’叶片的气孔导度及蒸腾速率均高于‘大西洋’。%To unravel the mechanism of drought tolerance in terms of photosynthesis, light response curves of'Kexin 1' and 'Atlantic' were compared under treatments of regular irrigation and drought stress. Although both varieties showed significantly decrease in net photosynthetic rate, stomatal conductance and transpiration rate under drought stress, 'Kexin 1' still exhibited greater net photosynthetic rate than that of'Atlantic', and the stomatal conductance and transpiration rate of'Kexin 1' were higher than those of 'Atlantic' under medium and strong light intensity.