水淹胁迫下10个树种某些生理指标的变化及其耐水淹能力的比较

以游离脯氨酸和丙二醛(MDA)含量及相对电导率为指标,比较了水淹条件下10个树种的耐水淹能力。结果表明,水淹胁迫下,不同树种的相对电导率及丙二醛含量均呈上升趋势,而游离脯氨酸含量的变化则有显著差异。根据生理指标的变化可以看出,黄连木(Pistacia chinensis Bunge)和石楠(Photinia serrulata Lindl.)的耐水淹能力较弱,耐水淹时间仅为5至10 d;蓝果树(Nyssa sinensis Oliv.)、薄壳山核桃〔Carya illinoensis(Wangenh.)Koch〕、榉树(Zelkova schneideriana Hand.-Mazz.)和一球悬铃木(Platanus occidentalis L.)具有一定的耐水淹能力,耐水淹时间约为25 d;乌桕〔Sapium sebiferum(L.) Roxb.〕和白蜡(Fraxinus chinensis Roxb.)的耐水淹能力较强,耐水淹时间超过45 d;墨西哥落羽杉(Taxodium macronatum Ten.)和花叶杞柳(Salixintegra‘Hakuro Nishiki’)的耐水淹能力最强,受水淹的60 d内无受害现象。

Change of some physiological indexes of ten tree species under waterlogging stress and comparison of their waterlogging tolerance

Using proline content,MDA content and electric conductivity as physiological indexes,the waterlogging tolerance of 10 tree species were compared under waterlogging stress.The results showed that electric conductivity and MDA content of different tree species had the trend of increment,but the change of proline content was varied under waterlogging stress.Pistacia chinensis Bunge and Photinia serrulata Lindl.had weak waterlogging resistance with the tolerating waterlogging duration for 5-10 d;Nyssa sinensis Oliv.,Carya illinoensis(Wangenh.) Koch,Zelkova schneideriana Hand.-Mazz.and Platanus occidentalis L.showed considerable waterlogging resistance with the tolerating waterlogging duration for 25 d;Fraxinus chinensis Roxb.and Sapium sebiferum(L.)Roxb.had stronger tolerance to waterlogging over 45 d;while Taxodium macronatum Ten.and Salix integra 'Hakuro Nishiki' had the strongest tolerance,no injury sympotom had been appeared in 60 d.