Breeding and Genetic Analysis of a New High Quality Aromatic Conventional Rice Variety,'Wantaixiangzhan'
To select a new high-quality fragrant conventional rice variety for production application,and to study the genetic similarity between this variety and its parents which will provide reference for the selection of breeding parents in the future.'Wantaixiangzhan',which was bred through pedigree breeding using'Taiguosimiao'as the female parent and'Tiandongxiang'as the male parent,been tested in the regional trial of the late indica rice group in the Guangxi Hengmao Joint Venture in 2017 and 2018,and conducted production trials simultaneously in 2018.The Badh2-E7 marker of aroma gene was used to detect'Wantaixiangzhan'and its parents.The genetic diversity of'Wantaixiangzhan'and its parents was analyzed by using 48 pairs of SSR primers.The results showed that the average yield of the two-year regional test was 454.89 kg/667 m2,which was 5.90％lower than the control variety'Shenliangyou5814'.The yield of the 2018 production test was 462.09 kg/667 m2,which was 2.92％lower than the control variety.The quality of rice has reached the second level of the national standard.It was approved by Guangxi Crop Variety Certification Committee in 2020(approval number:Guishendao 2020130).Badh2-E7 aroma gene was found in'Wantaixiangzhan'and'Tiandongxiang',while Badh2-E7 gene was not found in'Taiguosimiao'.The genetic similarity coefficients between'Wantaixiangzhan','Taiguosimiao'and'Tiandongxiang'are 0.747 5 and 0.756 8,respectively.The new high-quality and fragrant conventional rice variety,'Wantaixiangzhan'has strong tillering ability,slender grains,strong aroma and palatability.It is suitable for planting early and late rice in southern and central northern Guangxi.In terms of aroma and genetic relationship,'Wantaixiangzhan'is more inclined towards his male parent'Tiandongxiang'.
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