Genome-wide identification of quantitative trait loci for important plant and flower traits in petunia using a high-density linkage map and an interspecific recombinant inbred population derived from Petunia integrifolia and P.axillaris  

作　　者：Zhe Cao Yufang Guo Qian Yang Yanhong He Mohammed I.Fetouh Ryan M.Warner Zhanao Deng 

机构地区：[1]Department of Environmental Horticulture,Gulf Coast Research and Education Center,IFAS,University of Florida,14625 County Road 672,Wimauma,FL 33598,USA [2]Department of Horticulture,Michigan State University,East Lansing,MI 48824,USA [3]Key Laboratory of Horticultural Plant Biology,Ministry of Education,College of Horticulture and Forestry Sciences,Huazhong Agricultural University,430070 Wuhan,Hubei,China [4]Department of Horticulture,Faculty of Agriculture,Tanta University,Tanta 31527,Egypt

出　　处：《Horticulture Research》2019年第1期1505-1519,共15页园艺研究（英文）

基　　金：sponsored by USDA-SCRI grant 2011-51181-30666 and USDA-NIFA hatch projects FLA-GCR-005065 and FLA-GCC-005507.

摘　　要：Petunia is a very important flower in the global floriculture industry and has played a critical role as a model in plant genetic studies.Owing to limited genetic variability in commercial germplasm,development of novel petunia phenotypes and new varieties has become increasingly difficult.To enrich petunia germplasm and facilitate genetic improvement,it is important to explore genetic variation in progenitor species that may contain highly valuable genes/alleles.In this study,an interspecific recombinant inbred population(168 recombinant inbreds)derived from Petunia integrifolia×P.axillaris were phenotyped for days to anthesis(DTA),flower count(Flower_C),flower diameter(Flower_D),flower length(Flower_L),plant height(Plant_H),plant spread(Plant_S),and plant size(Plant_Z)in 2014 and 2015.Transgressive segregation was observed for all traits in both years.The broad-sense heritability on a 2-year basis varied from 0.38(Flower_C)to 0.82(Flower_L).Ten QTL were consistently identified in both years and by two mapping strategies[multiple QTL mapping(MQM)in MapQTL and inclusive composite interval mapping(ICIM)in IciMapping].Major QTL explained up to 30.2,35.5,and 47.1%of the total phenotypic variation for Plant_S,Flower_L,and Flower_D,respectively.These findings should be of significant values for introgression of desirable genes from wild petunias into commercial varieties and future genetic improvement of this important flower.

关 键 词：GERMPLASM TRAITS linkage 

分 类 号：S68[农业科学—观赏园艺]