摘要
两个抗旱性不同的高粱品种“3197B”和“三尺三”,在水分胁迫条件下,抗旱品种3197B渗透势降低,渗透调节能力较强.正常灌水时,两品种的气孔导度和蒸腾速率均随光照增强而增加,品种间差异不大;水分胁迫条件下,上午3197B气孔导度和蒸腾速率高于三尺三,午后水分胁迫严重时又低于三尺三,但其叶水势和膨压比三尺三高.
Osmotic adjustment capacity and its effect on stomatal conductance and transpiration rate were studied using seedling of two sorghum cultivars different in drought resistance (CV. 3197B, drought-resistance and San Chi San, drought susceptible) under water stress. The results showed that 3197B had a more negative osmotic potential and a higher osmotic adjustment. At normal moisture scheme, stomatal conductance and transpiration rate of both cultivars increased with the increase of solor radiation, and San Chi San exhibited a slightly higher conductance. Under water stress, the stomatal conductance and transpiration rate of 3197B were higher in the morning and lower in the afternoon than those of San Chi San, but water potential and turgor potential of the former were higher than the latter.
出处
《华北农学报》
CSCD
北大核心
1991年第1期68-73,共6页
Acta Agriculturae Boreali-Sinica
基金
国家自然科学基金
关键词
高粱
水分胁迫
渗透调节
气孔导度
Sorghum
Water stress
Osmotic potential
Osmotic Adjustment
Stomatal conductance
Transpiration rate
