不同花生品种幼苗对旱涝胁迫的响应

Responses of Different Varieties of Peanut Seedlings to Drought and Waterlogging

选择8个存在旱涝耐性差异的花生品种,在幼苗期分别进行旱、涝处理,探讨不同花生品种幼苗生长对旱、涝胁迫的响应。结果表明:花生不同器官对旱、涝的响应有差异,叶片、地上部的干物质高度同步或一致,它们的耐旱与耐涝的机制可能具有某些共性,其次是根系干物质、茎秆干物质、根冠比,而株高、叶长对旱、涝的响应不同步或不一致;不同品种花生对旱、涝的响应有差异,湘花2008对旱、涝胁迫的耐性均最强,其次是W2-15;综合来看,旱促根而植株矮壮,涝抑根而植株徒长。

Eight varieties of peanut, which have differences in drought tolerance and waterlogging tolerance, were used as experimental materials. The drought and waterlogging treatments were respectively conducted to peanuts at seedling stage in order to discuss the responses of different varieties of peanut seedlings to drought stress and waterlogging stress. The results showed that the responses of different organs to drought and waterlogging were different, in which dry matters in leaves or aerial part had high degree of synchronization or consistency to drought and waterlogging, they may have some common mechanism to drought tolerance and waterlogging tolerance, and followed by dry matters in root and stem and ratio of root to shoot, whereas the responses of plant height and leaf length to drought and waterlogging were inconsistent or asynchronous; different varieties showed different responses to drought and waterlogging, in which Xianghua 2008 had the highest tolerance to drought and waterlogging, and followed by W2-15. On the whole, drought will promote the growth of roots and lead plants dwarf and strong, waterlogging will suppress the growth of roots and lead plants leggy.