干旱胁迫对杂交鹅掌楸无性系叶片内源激素含量的影响

目的]研究干旱胁迫对杂交鹅掌楸无性系叶片内源激素含量的影响。方法]挑选抗旱性强的杂交鹅掌楸无性系NE25、NE78与抗旱性差的无性系NE04、NE23的1年生扦插苗为试验材料，对干旱胁迫下各无性系叶片中脱落酸（ABA）、吲哚乙酸（IAA）、玉米素核苷（ZR）和茉莉酸（JA）4种内源激素的含量变化进行研究。结果]干旱胁迫下，杂交鹅掌楸各无性系叶片ABA大量积累，抗旱性强的无性系含量变化不明显；IAA含量总体呈下降趋势，且抗旱性强的无性系含量变化较大；ZR含量变化各异，胁迫末期抗旱性强的无性系叶片ZR含量减少；抗性差的无性系叶片JA含量上升，说明抗性差的无性系需要维持较高的JA来抵御干旱胁迫。结论]该研究结果为杂交鹅掌楸耐旱无性系的筛选、园林栽培及应用提供了科学依据。

Effects of Drought Stress on Contents of Endogenous Hormones in Leaves of Different Clones of Liriodendron chinense×L.tulipifera

Objective] The aim was to study the effects of drought stress on contents of endogenous hormones in leaves of different clones of Liriodendron chinense×L.tulipifera.Drought-resistant Liriodendron chinense×L.tulipifera clones NE25,NE78 and drought-sensitive L.chinense×L.tulipifera clones NE04,NE23 were selected as experimental materials to study the content changes of four kinds of endogenous hormones such as abscisic acid(ABA),indoleacetic acid(IAA),ribosylzeatin(ZR) and jasmonic acid(JA) in leaves of different clones under drought stress.Result] Under drought stress,ABA was accumulated in leaves of different clones,however,the content changes in drought-resistant clones were not obvious;IAA content showed a decreasing trend,and the content changes in drought-resistant clones were relatively larger;changes of ZR contents in different clones were different,and ZR content in leaves of drought-resistant clones during later period of drought stress was decreased;JA content showed an increasing trend in leaves of drought-sensitive clones,indicating that drought-sensitive clones had to maintain higher contents of JA to resist drought stress.Conclusion] The result of this study had provided scientific basis for the screening,planting and application of drought-resistant clones of L.chinense×L.tulipifera.