高温胁迫对多年生黑麦草种苗特性的影响

Effects of High Temperature Stress on the Seedling Characteristics of Perennial Ryegrass

[目的]缓解多年生黑麦草的越夏问题,筛选优良的耐热品种。[方法]以多年生黑麦草3个牧用型品种麦迪、纽依和雅晴为研究对象,进行高温处理,通过测定其萌发与幼苗特性,研究高温胁迫对其种苗特性的影响。[结果]在高温胁迫下,各品种相对发芽率、相对发芽指数、相对活力指数、相对根苗长等指标总体上均呈下降趋势。结合各指标综合评定,3种多年生黑麦草在高温胁迫下的耐热性从强到弱依次为麦迪、纽依、雅晴。[结论]该研究可为获得高耐热性的多年生黑麦草品种提供理论指导。

[Objective] To alleviate the summer-overing problem and screen out good heat-resistant varieties of perennial ryegrass. [Method] Three species of perennial ryegrass Nui, Mathilde and Yatsyn were used as research objects to make high temperature stress. The effects of high temperature stress on the seedling characteristics of perennial ryegrass were studied by determining the germination and seedlings’ characteristics. [Result] Under high temperature stress, the relative germination rate, relative germination index, relative vigor index, relative root length and other indices of three species of perennial ryegrass all declined. Combined with comprehensive evaluation of all indices, the resistance order of high three species of perennial ryegrass to high temperature stress was Mathilde 〉 Nui 〉 Yatsyn.[Conclusion]The research could provide theoretical basis for screening out perennial ryegrass species with high heat-resistance.