【摘要】 为探究旱胁迫下外源ABA对玉米品种叶片光合作用以及气孔开度的影响情况,以玉米品种’郑单988’为研究对象,采用PEG、ABA、ABA+PEG不同处理对不同时间节点下玉米苗期叶片光合作用、气孔张开程度和叶绿素含量变化进行研究。发现不同处理下3个时间节点光合速率、蒸腾速率、气孔导度和叶绿素含量均低于对照,而气孔闭合数目均高于对照;ABA+PEG处理的4个指标均处于PEG和ABA处理之间。说明干旱胁迫下玉米为了维持自身的生长发育,通过关闭气孔减少水分蒸腾;外施ABA可增加干旱胁迫下气孔的关闭数目和叶绿素含量,减少水分流失的同时提高旱胁迫下植株的光合速率,最终提高植株的抗旱能力。更多还原

【Abstract】 This study is to investigate the effects of exogenous ABA on photosynthesis and stomatal opening of maize leaves under drought stress. The excellent maize variety’Zhengdan 988’was used as the material, the changes of photosynthesis, stomatal opening and chlorophyll content of maize seedlings at different time points were studied under PEG treatment, exogenous ABA treatment and ABA+PEG treatment. The results showed that the photosynthesis rate, transpiration rate, stomatal conductance and chlorophyll content of the three treatments were lower than that of CK, and the number of stomatal closure was higher than that of CK. The four indicators of ABA+PEG treatment were between PEG and ABA treatment which indicated that maize reduced transpiration by closing the stomata in order to maintain the growth and development under drought stress.Exogenous ABA can increase the number of stomatal closure and chlorophyll content under drought stress,which reduce water loss and increase the photosynthesis rate of plants under drought stress, and finally improve the drought resistance of the plants.更多还原