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采用室内水培试验法 ,选择高水肥型玉米品种 ,以 PEG6 0 0 0模拟干旱胁迫 ,Hoagland全营养液和无磷营养液控制磷素水平 ,用压力室法测定了三叶期的玉米根系导水率 (L pr)的变化规律。结果表明 :缺磷植株根系的导水率显著降低 ,但在复磷后 4～ 2 4 h内导水率能恢复到与供磷对照植株接近的数值 ;干旱胁迫可导致玉米根系导水率急剧降低 ,但供磷处理的导水率仍然大于无磷处理 ;复水后 ,供磷植株 Lpr 恢复能力较无磷植株强 ,表明磷处理植株对干旱有较强的忍受能力和恢复能力。 Hg Cl2 处理表明磷营养可通过影响水通道蛋白的活性或表达量来调节根系导水率。
The indoor hydroponic test was used to select the maize varieties with high water and fertilizer, and the phosphorus levels were controlled by PEG6000 simulated drought stress, Hoagland total nutrient solution and phosphate-free nutrient solution. The pressure-chamber method was used to determine the root guidance The variation of water rate (L pr). The results showed that the hydraulic conductivity of root deficient plants decreased significantly, but within 4 ~ 24 h after rephosphorization, the hydraulic conductivity could return to the value close to that of the control plants. Under drought stress, the root hydraulic conductance of maize The water conductivity of P-treated plants was still higher than that of non-P-treated plants. After rewatering, Lpr plants had stronger ability of recovering Lp than non-P-producing plants, which indicated that P-treated plants had stronger endurance and resilience to drought. Hg Cl2 treatment indicated that phosphorus nutrition regulates root hydraulic conductivity by affecting aquaporin activity or expression levels.