摘要
以盆栽玉米（掖单４号）幼苗为材料，在土壤缓慢干旱但无昼夜温差条件下，研究了叶片Ψｗ、Ψｓ、Ψｐ和叶片伸长速度的昼夜变化。结果表明干旱条件下，白天叶片伸长速度大于夜间叶片伸长速度；白天叶基部Ψｐ值高于夜间Ψｐ值；白天叶基部的高Ψｐ_值是Ψｓ值增加（即渗透调节作用）所致。Ψｐ值较高是白天叶片伸长速度较高的重要原因。
The durinal changes of leaf and leaf elongation rate in Maize seedlings(YeDan No.4)were studied under soil drought as well as no durinal temperature change condition. The results showed that under drought condition,the leaf elongation rate during daytime was greater than that at nighttime with the leaf base's during daytime higher than that at night. The higher at the leaf base was attributed to the increase in the leaf(i,gosmotic regulation).It is concluded that the higher of leaf base may be the main cause of higher rate of leaf elongation during daytime.
出处
《河北农业大学学报》
CSCD
北大核心
1996年第1期22-25,共4页
Journal of Hebei Agricultural University
基金
"八五"农业部重点"应用基础研究"项目
关键词
玉米
叶片
伸长速度
水势
渗透势
膨压
maize
leaf elongation rate
water potential
osmotic potential
pressure potential
