9个紫花苜蓿品种对淹水胁迫的响应及耐涝性评价

Effects of flooding stress on biological characteristics of different alfalfa varieties and evaluation of their waterlogging tolerance

摘要:

【目的】筛选淹水胁迫下适应性相对较强的紫花苜蓿（Medicago sativa）品种，为紫花苜蓿耐涝性研究提供基础材料。【方法】采用套盆法模拟淹水条件，探究淹水对紫花苜蓿苗期生物学特性的影响 。【结果】淹水 7 d 时 ，紫花苜蓿株高均高于对照 ，巨能 7 耐湿 、角斗士 、巨能 801、WL440HQ、 WL525HQ 和 WL656HQ 品种的茎干重、叶干重和地上干生物量都高于对照，巨能 995、角斗士、巨能 801、WL525HQ、WL656HQ、WL712 的主根长高于对照。淹水胁迫至第 14 d 时，仅有 2~3 个品种主根长、茎干重、叶干重和地上干生物量等指标高于对照。【结论】采用主成分分析法和隶属函数法进行耐涝性综合评价，巨能 995、WL440HQ、角斗士等品种耐涝能力较高。

Abstract:

【Objective】 In order to determine the relatively strong adaptability of alfalfa（Medicago sativa） varieties under flooding stress.【Method】 The pot covering method was used to simulate the flooding conditions and explore the impact on the biological characteristics of alfalfa seedlings，in order to provide basic materials for the study of alfalfa waterlogging tolerance.【Result】 The results showed that the plant height of alfalfa was higher than that of control after 7 days of flooding. The stem dry weight，leaf dry weight and aboveground dry biomass of Juneng 7，gladiator，Juneng 801，WL440HQ，WL525HQ and WL656HQ were higher than those of control. The main root length of Juneng 995，gladiator，Juneng 801，WL525HQ，WL656HQ and WL712 were higher than that of control. At the 14th day of flooding stress，only 2 ‐3 varieties had higher main root length，stem dry weight，leaf dry weight and aboveground dry biomass than the control.【Conclusion】 The comprehensive evaluation of waterlogging tolerance was carried out by principal component analysis and subordinate function method. The waterlogging tolerance of Juneng 995， WL440HQ，gladiator and other varieties was higher.