Indica Genetic Constitution and Genetic Diversity Analysis in Maintainer Line of Dian-type Japonica Hybrid Rice
1 Rice Research Institute, Yunnan Agricultural University, Kunming, 650201, China
2 Yunnan Engineering Research Center for Japonica Hybrid Rice, Kunming, 650201, China
Molecular Plant Breeding, 2018, Vol. 9, No. 7
Received: 30 Jul., 2018 Accepted: 27 Aug., 2018 Published: 14 Sep., 2018
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This article was first published in Molecular Plant Breeding (2017, 15: 4190-4195) in Chinese, and here was authorized to translate and publish the paper in English under the terms of Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
In this research, we analyzed the Indica genetic component ratios and genetic diversity of 231 maintainer line materials of Dian-type Japonica hybrid rice from Rice Research Institute of Yunnan Agricultural University with 23 insertion/deletion (InDel) polymorphic markers screened. We found that indica genetic component ratios (Fi) of all the materials were low and Fi ≤ 0.25. The percentage of 0 < Fi ≤ 0.05, 0.05 < Fi ≤ 0.1, 0.1 < Fi ≤ 0.15, 0.15 < Fi ≤ 0.2, and 0.2 < Fi ≤ 0.25 were 22.94%, 33.33%, 26.41%, 7.36% and 3.03%, respectively. The percentage of materials without indica genotypes site was 6.93%. The results showed that most of the materials had indica genetic components, although genetic backgrounds of all the materials were dominated by Japonica ones. We also found that Nei’s genetic diversity index (H) among all the materials was only 0.143,2, although the materials were collected from various sources. Such result might be due to lesser allelic number detected by InDel markers InDel than that detected by simple sequence repeat (SSR) markers. We also found that Nei’s genetic diversity indexes (H) were different among materials from different sources, and them ranged from 0.104,4~0.177,5. Genetic diversity values of the materials from various sources were ranged as Northeast China > RRI-YAU > East China > Overseas > other places of Yunnan > CAAS > YAAS.
Dian-type Japonica hybrid rice; Maintainer line; Indica genetic component; InDel marker; Genetic diversity
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