不同玉米品种水分利用效率的差异性研究

通过盆栽试验结果表明：12个品种在生物学产量、耗水量和水分利用效率上存在显著或极显著差异；12个品种的气孔导度与光合速率、蒸腾速率均呈直线相关，但气孔导度对蒸腾速率的相关系数＞气孔导度对光合速率的相关系数；品种间气孔调节能力为农大60＞中单2号＞陕单911；正常供水条件下三个品种的根冠比相差不大，中度胁迫根系的相对总量为农大60＞中单2号＞陕单911，在正常水分条件下，三个品种的根系导水率为陕单911＞农大60和中单2号，PEG中度渗透胁迫下根系导水率农大60增加了54.64%，中单2号下降了50.94%，陕单911下降了63.00%；渗透调节能力为陕单911＞中单2号＞农大60，三个品种的失水速度为陕单911＞农大60＞中单2号。

Diversity of water use efficiency of various maize varieties

Based on pot experiments and water experiments,the results show that water consumption,biomass accumulation and water use efficiency of 12 varieties existed obvious diversity;the relationships of Gs,Pn and Tr of 12 varieties were linear,the correlativity between Gs and Tr was higher than the correlativity between Gs and Pn;stoma adjustment ability was nongda 60>zhong dan 2>shandan 911;on the condition of normal water,(distinguishing) of root/canopy ratios of three varieties was not obvious;under middle water stress,root weight was nongda 60>zhongdan 2>shandan 911,the hydraulic conductivity of root was that nongda 60 increased(54.64%,) zhongdan 2,shandan 911 respectively declined 50.94%,63.00%;the osmosis adjusting capacity was shandan 911>zhongdan 2>nongda 60,the excised leaf water retention capability was shandan911>nongda 60>zhongdan 2.