木芙蓉对淹水胁迫的响应及其耐涝性综合评价

Response of Hibiscus mutabilis to Waterlogging Stress and Comprehensive Evaluation of Waterlogging Tolerance

为挖掘木芙蓉(Hibiscus mutabilis)耐涝种质资源,对13个木芙蓉品种水淹15 d后的形态和生理生化指标进行研究,并构建耐涝评价体系。结果表明,水淹胁迫后,木芙蓉品种各性状的变化趋势和幅度均不同,部分性状间的相关性显著(P<0.05)。14个指标按贡献率大小归因为形态生长指标、不定根形态指标、膜脂过氧化指标、根系生物量指标、抗氧化指标及渗透调节指标。根据综合耐涝评价值(D)进行聚类分析,表明13个木芙蓉品种可分为强耐涝(3个品种)、较强耐涝(5个品种)、中等耐涝(3个品种)和不耐涝(2个品种)等4个类型。因此,株高、不定根数、不定根长可作为木芙蓉苗期耐涝性快速、简便的鉴定指标。

In order to excavate the waterlogging resistant germplasm resources of Hibiscus mutabilis,the morphological,physiological and biochemical indexes of 13 cultivars were studied after 15 days of flooding,and build the evaluation system of waterlogging resistance.The results showed that the variation trend and range of morphological and physiological indexes were different among cultivars,and the correlation of some indexes was significant(P<0.05).The 14 indexes were attributed to morphological growth index,adventitious root morphological index,membrane lipid peroxidation index,root biomass index,antioxidant index and osmotic regulation index according to contribution rate.Cluster analysis conducted according to comprehensive waterlogging resistance evaluation value(D)showed that 13 H.mutabilis varieties could be divided into four waterlogging tolerance types,including very strong(3 varieties),stronger(5 varieties),medium(3 varieties)and none waterlogging tolerance(2varieties).Therefore,the plant height,adventitious root number,adventitious root length could be used as rapid and simple indexes to identify the comprehensive waterlogging tolerance at seedling stage in H.mutabilis.