Inheritance of heat tolerance in perennial ryegrass ( Lolium perenne , Poaceae): evidence from progeny array analysis

PeerJ

article

Wagdi S. Soliman¹  Ahmed M. Abbas²  Stephen J. Novak⁴  Masahiro Fujimori⁵  Kazuhiro Tase⁶  Shu-ichi Sugiyama⁷ 

[1] Department of Horticulture, Faculty of Agriculture and Natural Resources, Aswan University;Department of Biology, College of Science, King Khalid University;Department of Botany and Microbiology, Faculty of Science, South Valley University;Department of Biological Sciences, Boise State University;Yamanashi Dairy Agricultural Station;National Agricultural Research Center for Hokkaido Region;Hirosaki University

关键词: Chlorophyll fluorescence;    Genetic background;    Heat stress;    Hydrogen peroxide;    Lolium perenne;   

DOI  :  10.7717/peerj.11782

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

BackgroundHeat stress is considered one of the most important environmental factors influencing plant physiology, growth, development, and reproductive output. The occurrence and damage caused by heat stress will likely increase with global climate change. Thus, there is an urgent need to better understand the genetic basis of heat tolerance, especially in cool season plants.Materials and MethodsIn this study, we assessed the inheritance of heat tolerance in perennial ryegrass (Lolium perenne L. subspecies perenne) , a cool season grass, through a comparison of two parental cultivars with their offspring. We crossed plants of a heat tolerant cultivar (Kangaroo Valley) with plants of a heat sensitive cultivar (Norlea), to generate 72 F1 hybrid progeny arrays. Both parents and their progeny were then exposed to heat stress for 40 days, and their photosynthetic performance (Fv/Fm values) and leaf H2O2 content were measured.ResultsAs expected, Kangaroo Valley had significantly higher Fv/Fm values and significantly lower H2O2 concentrations than Norlea. For the F1 progeny arrays, values of Fv/Fm decreased gradually with increasing exposure to heat stress, while the content of H2O 2 increased. The progeny had a wide distribution of Fv/Fm and H 2O2 values at 40 days of heat stress. Approximately 95% of the 72 F1 progeny arrays had Fv/Fm values that were equal to or intermediate to the values of the two parental cultivars and 68% of the progeny arrays had H2O2 concentrations equal to or intermediate to their two parents.ConclusionResults of this study indicate considerable additive genetic variation for heat tolerance among the 72 progeny arrays generated from these crosses, and such diversity can be used to improve heat tolerance in perennial ryegrass cultivars. Our findings point to the benefits of combining physiological measurements within a genetic framework to assess the inheritance of heat tolerance, a complex plant response.

【 授权许可】

CC BY