干旱胁迫和复水后台湾相思、银合欢和火棘幼苗的生理变化  

Physiological changes of Acacia confusa,Leucaena leucocephala and Pyracantha fortuneana seedlings under drought stress and rewatering

作　　者：卢广超[1] 许建新 薛立[1] 刘斌[1] 吴彩琼 邵怡若[1] 

机构地区：[1]华南农业大学林学院,广州510642 [2]深圳市铁汉生态环境股份有限公司

出　　处：《林业科技开发》2013年第1期55-59,共5页China Forestry Science and Technology

基　　金：国家科学技术部农业科技成果转化资金项目"裸露坡面生态恢复新技术应用研究"(编号:2009GB2E020423)

摘　　要：以台湾相思、银合欢和火棘幼苗为试验材料,人工模拟干旱胁迫环境,通过测定各树种幼苗叶片的生理指标,研究了干旱胁迫对这3种幼苗的影响,并用主成分法综合评定了各树种的抗旱性。结果表明,干旱胁迫期间3种幼苗的叶片组织含水量下降,复水处理后恢复到与对照相近水平;3种幼苗叶片的叶绿素含量上升,复水后下降;3种幼苗叶片的脯氨酸、可溶性蛋白、可溶性糖含量上升或上升后下降,复水后一般恢复到对照水平;台湾相思和火棘幼苗的叶片SOD活性显著上升后小幅波动,而银合欢的幼苗叶片SOD活性持续增加;台湾相思和火棘幼苗的叶片丙二醛含量逐渐上升,银合欢上升后波动。3种幼苗叶片的SOD活性和丙二醛含量复水后均下降。对生理指标进行主成分分析表明,3种幼苗的抗旱性为台湾相思>银合欢>火棘。Studies on physiological changes of seedlings of Acacia confusa,Leucaena leucocephala,Pyracantha fortuneana were conducted under drought stress in greenhouse.The drought resistance of these seedlings was evaluated by testing their physiological properties and principal component analysis.The results showed that water contents of the three seedlings decreased during drought stress period and recovered to the control level after rewatering;their chlorophyll content increased during drought stress period and decreased after rewatering.The contents of free proline,soluble protein and soluble sugar of the three seedlings increased or increased followed by a decrease during drought period and generally recovered to the control level after rewatering.The activity of SOD of A.confusa and P.fortuneana rapidly increased and then fluctuated slightly,whereas that of L.leucocephala continuously increased.The content of MDA of Acacia confusa and P.fortuneana seedlings gradually increased and that of L.leucocephala seedlings increased and then fluctuated,and their SOD and MDA recovered to the control level after rewatering.Principal component analysis indicated that their ability of drought resistance was A.confusaL.leucocephalaP.fortuneana.

关 键 词：幼苗 抗旱胁迫 生理指标 主成分分析 

分 类 号：S792.360.1[农业科学—林木遗传育种]