QTL Analysis to Improve and Diversify the Grain Shape of Rice Cultivars in Korea,  Using the Long Grain japonica Cultivar,  Langi

Suk-Man Kim; Hyun-Su Park; Chang-Min Lee; Man-Kee Baek; Young-Chan Cho; Jung-Pil Suh; Oh-Young Jeong

doi:10.7740/kjcs.2020.65.4.303

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2020 Vol.65, Issue 4 Preview Page Next Page

QTL Analysis to Improve and Diversify the Grain Shape of Rice Cultivars in Korea, Using the Long Grain japonica Cultivar, Langi 초장립종 벼를 이용한 입형 관련 QTL 분석 및 국내 벼 품종 입형 개선 연구

1 December 2020. pp. 303-313

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Abstract

Rice grain shape is one of the key components of grain yield and market value. An understanding of the genetic basis of the variation in grain shape could be used to improve grain shape. In this study, we developed a total of 265 F₂ individuals derived from a cross between japonica cultivars (Josaeng-jado and Langi) and used this population for quantitative trait locus (QLT) analysis. Correlation analysis was performed to identify relationships between grain traits (GL: grain length, GW: grain width, L/W: ratio of length to width, TGW: 1,000 grain weight). The grain shape was positively correlated with GL and TGW, and negatively correlated with GW. In QTL analysis associated with grain shape, one QTL for GL, qGL5, detected on chromosome 5, explained 20.3% of the phenotypic variation (PV), while two QTLs, qGW5 (PV=36.1) and qGW7 (PV=26.1), for GW were identified on chromosomes 5 and 7, respectively. Evaluation of the effects of each of the QTLs on the grain shape in the population showed a significant difference in the grain size in positive lines compared with the lines without the QTLs. According to the QTL combination of the allelic-types, the grain shape of the tested lines varied from semi-round type to long spindle-shaped type. The results of this study extend our knowledge about the genetic pool governing the diversity of grain shape in japonica cultivars and could be used to improve the grain shape of this species through marker-assisted selective breeding in Korea.

Keywords

grain shape

grain size

japonica cultivars

QTL

rice

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Information

Publisher :The Korean Society of Crop Science
Publisher(Ko) :한국작물학회
Journal Title :The Korean Journal of Crop Science
Journal Title(Ko) :한국작물학회지
Volume : 65
No :4
Pages :303-313
Received Date : 2020-06-19
Revised Date : 2020-08-11
Accepted Date : 2020-09-14
DOI :https://doi.org/10.7740/kjcs.2020.65.4.303

The Korean Journal of Crop Science ISSN:0252-9777(Print) 2287-8432(Online) 한국작물학회지

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