<FONT face="Verdana">Relationship Between Subspecies Differentiation and Rice  Quality Traits in RILs Population from IndicaJaponica Cross <BR></FONT>

MAO Ting,XU hai,GUO Yan-hua,ZHU Chun-jie,CHEN Kai,WANG  Jia-yu,JIANG  Shu-kun,XU Zheng-jin*

doi:10.3969/j.issn.1001-7216.2010.05.005

Chinese Journal OF Rice Science >

2010 , Vol. 24 >Issue 5: 474 - 478

DOI: https://doi.org/10.3969/j.issn.1001-7216.2010.05.005

研究报告

Relationship Between Subspecies Differentiation and Rice Quality Traits in RILs Population from IndicaJaponica Cross

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Rice Research Institute, Shenyang Agricultural University/Key Laboratory of Crop Physiology, Ecology, Genetics and Breeding, Ministry of Agriculture/Key Laboratory of Northern Japonica Rice Breeding of Liaoning, Shenyang 110161, China; *Corresponding author, E-mail: xuzhengjin@126.com

Received date: 1900-01-01

Revised date: 1900-01-01

Online published: 2010-09-10

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Abstract

In 2006-2007, the F8 (92 lines) and F9 (142 lines) generations of the recombinant inbred lines (RILs) populations derived from a cross between Qishanzhan (indica cultivar) and Akihikari (japonica cultivar) were used to investigate the Cheng′s index (ChI) and performance of indica/japonica diagnostic SSR markers (Dj value), and 11 rice quality traits. In the study, ChI was used to represent morphological differentiation (ChI<14, indica type; ChI≥14, japonica type) and Dj value was to display genetic differentiation, which is number of SSR loci identical to those of Akihikari divided by total number of SSR loci identical to Akihikari and Qishanzhan (Dj<50, indica type; ChI≥50, japonica type). Both F8 and F9 populations showed a normal distribution in the ChI and Dj values. The number of lines with indica type was similar to those with japonica type based on the ChI values, whereas an obvious japonicainclined distribution was found based on the Dj values in the two populations. There was no significant difference in most rice quality traits except milled rice width between indica and japonica types classified by the ChI values. Based on the Dj values, the two RILs populations could be divided into japonicalinous type (Dj<75) and japonica type (Dj≥75). The japonica type showed significantly higher brown rice rate, milled rice rate and milled rice width, and significantly lower ratio of milled rice length to width than the japonicalinous type. The Cheng′s index had no significant relationship with all the rice quality traits in the two generations. The Dj value had significantly positive correlations with brown rice rate, milled rice rate and milled rice width, and significantly negative correlation with the ratio of milled rice length to width. It is suggested that there was no significant correlation between the morphological differentiation and rice quality traits in japonica rice in northern China, and the milled rice quality could be improved through increasing japonica component in genetic differentiation.

Key words： rice; quality; simple sequence repeat marker; Cheng′s index; indica and japonica differentiation

Cite this article

MAO Ting,XU hai,GUO Yan-hua,ZHU Chun-jie,CHEN Kai,WANG Jia-yu,JIANG Shu-kun,XU Zheng-jin* . Relationship Between Subspecies Differentiation and Rice Quality Traits in RILs Population from IndicaJaponica Cross
[J]. Chinese Journal OF Rice Science, 2010 , 24(5) : 474 -478 . DOI: 10.3969/j.issn.1001-7216.2010.05.005

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