水分胁迫对抗旱性不同小麦品种叶片光合及根呼吸等生理特性的影响

以两个抗旱性不同的小麦品种西农1043、陕253为材料，采用盆栽与水培试验相结合的方式，研究水分亏缺对小麦不同生育期叶片光合及根呼吸速率等生理指标的影响。结果表明：相同水分处理下，抗旱品种西农1043与水分敏感品种陕253相比，具有较高的光合和根呼吸速率、以及相对较高的保护酶活性；水分胁迫下，两个小麦品种叶片光合和根呼吸速率及苗期叶保护酶活性均降低；两种水分处理下抗旱性强的西农1043根呼吸所占光合的比例相对高于陕253。

Effects of water deficit on the rate of leaf photosynthesis and root respiration in two winter wheat of different drought resistance

Xinong 1043 and Shaan 253 of two winter wheat varieties were used pot and nutrient solution culture experiments to studied the effect of water deficit on the rate of leaf photosynthesis and root respiration during different growth stages under different water stress.The results showed that the drought resistance wheat Xinong 1043 rate of leaf photosynthesis,root respiration and activities of leaf protective enzyme in seedling stage are higher than that of the water sensitivity wheat Shaan 253 under same water condition.The rate of leaf photosynthesis and root respiration of the two wheat are lower under normal water condition than that of under water deficit;and Xinong 1043 are higher ratio of root respiration and leaf photosynthesis rate compared with Shaan 253 under the two water condition.