Genetic Effects of Indica Lineage Introgression on Amylopectin Chain Length Distribution in Japonica Milled Rice

Juan Cui, Xue Zhao, Yuejiao Yu, Wenxing Zhang, Ximan Kong, Jian Sun and Wenfu Chen
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Juan Cui: Rice Research Institute, Shenyang Agricultural University, Shenyang 110866, China
Xue Zhao: Rice Research Institute, Shenyang Agricultural University, Shenyang 110866, China
Yuejiao Yu: Rice Research Institute, Shenyang Agricultural University, Shenyang 110866, China
Wenxing Zhang: Rice Research Institute, Shenyang Agricultural University, Shenyang 110866, China
Ximan Kong: Rice Research Institute, Shenyang Agricultural University, Shenyang 110866, China
Jian Sun: Rice Research Institute, Shenyang Agricultural University, Shenyang 110866, China
Wenfu Chen: Rice Research Institute, Shenyang Agricultural University, Shenyang 110866, China

Agriculture, 2022, vol. 12, issue 4, 1-17

Abstract: The fine structure of amylopectin affects rice quality; in particular, the amylopectin chain length distribution (ACLD) in milled rice differs between subspecies of Oryza sativa L. However, the correlation between ACLD and quality trait factors, and the genetic basis of ACLD phenotypic variation, are still unknown. Here, the correlations of ACLD with cooking and eating quality and with the rapid viscosity analysis (RVA) index were studied using chromosome segment substitution lines (CSSLs). Clear variations in ACLD were observed in introgression lines: introgression of indica segments of chromosome 3 and 7 increased the proportion of amylopectin Fa, and another segment of chromosome 3 reduced the proportion of amylopectin Fb2. A segment of chromosome 11 decreased the proportion of amylopectin Fa but increased that of Fb3. Correlation analysis with the RVA index further showed that the breakdown viscosity (BDV) was negatively correlated with the proportion of amylopectin Fb1, Fb2, and Fb3 chains, and positively correlated with Fa. Consistency viscosity (CSV) values were negatively correlated with the proportion of amylopectin Fb1, Fb2, and Fb3 chains. We thus clarified the quality trait factors determined by variation in ACLD, and provide key information for pyramiding inter-subspecific genetic superiority in molecular design breeding for rice quality.

Keywords: amylopectin chain length distribution; quality trait factors; RVA; indica lineage; genetic background (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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