干旱胁迫对红花檵木生长及生理特性的影响

摘要

【目的】研究土壤干旱胁迫对红花檵木生长及生理特性的影响。【方法】采用盆栽控水法，设置4个水分处理，测定在各水分处理下红花檵木的生长和生理指标，分析其差异。【结果】随胁迫程度的加深和时间的延长旱害表现越严重，营养生长和生殖生长受抑，RWC 下降，相对电导率值和 MDA 含量增加，Pro、SS、SP 不断积累，SOD、POD、CAT 活性总体上升。【结论】红花檵木对干旱胁迫较为敏感，轻度胁迫即可引起各项生理指标显著变化，但植株表观形态变化不明显；随胁迫程度的加深，各项指标变幅加剧，形态变化明显。红花檵木具有一定的抗旱性，能在中度干旱胁迫下继续存活，并能忍受连续60d 不供水的重度干旱胁迫。%Objective]The aim of the study was to study effects of soil drought on growth and physiological traits of L.chinense .[Method]Tn this study,there were four different water treat-ments.The growth and physiological indicators were measured and differences among treatments were analyzed.[Results]The damage magnitude was increased with increasing drought stress and time.RWC,nutrition and reproduction growth and was inhibited.However,relative conductivi-ty,MDA,SOD,POD and CAT were increased.Pro,SS and SP were accumulated.[Conclusion]L.chinense was sensitive to drought stress.Slight drooght treatments can cause significant chan-ges in various physiological indexes but the apparent features were not clear.The physiological and morphological indexes were affected substantially with increasing drought stress.Overall,L. chinense had strong resistance to drought.It could survive in moderate drought stress and endure severe drought stress that without water supplying for 60 days.