铝胁迫对青杨雌雄幼苗生理生态特征的影响  

Effects of aluminum stress on ecophysiological characteristics of male and female Populus cathayana seedlings

作　　者：李俊钰[1,2] 胥晓[1,3] 杨鹏[1,2] 王碧霞[1,2] 王志峰[1,2] 李霄峰[1,2] 

机构地区：[1]西华师范大学生命科学学院,四川南充637002 [2]西南野生动植物资源保护教育部重点实验室,四川南充637002 [3]西华师范大学珍稀动植物研究所,四川南充637002

出　　处：《应用生态学报》2012年第1期45-50,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30771721;31170389)资助

摘　　要：以青杨雌雄幼苗为对象,研究铝胁迫(Al3+浓度为216mg·kg-1)下其生理生态特征及光合作用的差异.结果表明:铝胁迫下,青杨幼苗的丙二醛和可溶性蛋白含量显著增加(P<0.001),且雄株的丙二醛显著低于雌株,而可溶性蛋白显著高于雌株;雄株过氧化物酶活性显著增加、超氧化物歧化酶活性显著降低,而雌株无显著变化;雌雄幼苗的光合速率显著降低(P=0.001),雌株的蒸腾速率显著下降(P=0.007)、瞬时水分利用效率显著增加,而雄株均无显著变化;雌株幼苗的叶绿素a含量、总叶绿素含量和叶绿素a/b值显著降低,而雄株的叶绿素a/b值显著高于雌株;雌株的比叶面积显著降低、雄株的比叶面积显著增加,而叶和茎的干物质量无显著变化.与雌株相比,青杨雄株的可溶性蛋白含量、抗氧化酶活性、叶绿素含量和光合速率较高,其抗逆性更强.This paper studied the sex-specific differences of male and female Populus cathayana seedlings in their ecophysiological characteristics and photosynthesis under the stress of aluminum （216 mg Al3＋·kg-1）. Under the effects of aluminum, the malonaldehyde （MDA） and soluble protein （Pr） contents of the male and female seedlings increased significantly （P0.001）, and the males had a significantly lower MDA content and a significantly higher Pr content than the females. The peroxidase （POD） activity of the males increased but the superoxide dismutase （SOD） activity decreased significantly, while the POD and SOD activities of the females had no significant variation. The net photosynthetic rate （Pn） of both male and female seedlings decreased significantly （P=0.001）, and the transpiration rate （Tr） of the female seedlings decreased （P=0.007） and the instant water use efficiency （WUEi） increased significantly, while no significant variations were observed in the Tr and WUEi of the male seedlings. The total chlorophyll and chlorophyll a contents and chlorophyll a/b ratio of the females decreased significantly, resulting in a significantly higher chlorophyll a/b ratio of the males. The specific leaf area （SLA） of the females decreased but that of the males increased significantly. No significant variation was observed on the leaf- and stem dry mass. Comparing with the females, the males had higher Pr and chlorophyll contents and higher active antioxidant enzymes activity to maintain higher Pn, and thus, had greater resistance against aluminum stress.

关 键 词：青杨 雌雄异株 铝胁迫 生理生态特征 

分 类 号：X173[环境科学与工程—环境科学]