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Genotypic and phenotypic diversity of heat tolerance among and within perennial ryegrass (Lolium perenne L.)

文献类型： 外文期刊

作者： Zhu, Yongqun 1 ; Liao, Zongchao 2 ; Yang, Jian 2 ; Ye, Haotian 2 ; Han, Chongyang 2 ; Xu, WenZhi 1 ; Nie, Gang 2 ;

作者机构： 1.Sichuan Acad Agr Sci, Inst Agr Resources & Environm, Chengdu 610066, Sichuan, Peoples R China

2.Sichuan Agr Univ, Coll Grassland Sci & Technol, Dept Forage Breeding & Cultivat, Chengdu 611130, Sichuan, Peoples R China

关键词： Heat tolerance; Lolium perenne; Phenotypic evaluation; SSR marker

期刊名称：BRAZILIAN JOURNAL OF BOTANY （ 影响因子：1.368； 五年影响因子：1.566 ）

ISSN： 0100-8404

年卷期：

页码：

收录情况： SCI

摘要： Perennial ryegrass (Lolium perenne L.) is a common cool season forage and turfgrass species that is widely distributed in subtropical and temperate regions. Generally, perennial ryegrass is susceptible to high temperature conditions. However, due to being cross-pollinated and its heterozygosity, wide variations are possible among and within different genotypes. In this study, the phenotypic and genetic diversity of heat tolerance among and within perennial ryegrass varieties was analyzed. Results showed that 212 polymorphic bands (86.1%) were recorded using 27 pairs of SSR primers, and the variation among varieties mainly accounted for 6.39% of the total variation, while that within varieties accounted for 93.61%. The clustering and PCoA revealed that the genotypes of the four varieties could be roughly distinguished. The wilting degree, RHT, EL, MDA, Chl, and Fv/Fm of different varieties and genotypes were significantly different after high temperature stress, and Caribra specifically showed the worst leaf wilting performance. Esquire and Granddaddy had higher HT and RHT after heat stress and recovery, which indicated better characteristics relative to heat tolerance of two varieties. The variation in EL within varieties did not change obviously after high temperature stress, indicating that membrane stability provides important support for the heat resistance of perennial ryegrass germplasm. In conclusion, there were significant differences in heat resistance among and within different perennial ryegrass varieties, and the variation among varieties was lower than that within varieties of the total variation. The phenotypic and genetic diversities are important for further mechanism studies and the screening of potential plant materials to establish effective breeding programs.

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