QTL detection and stability analysis of rice panicle traits in different environments

doi:10.14088/j.cnki.issn0439-8114.2026.01.002

Abstract

Abstract: The analysis of the genetic mechanism of panicle traits in rice (Oryza sativa L.) and the identification of its excellent alleles were important directions for crop genetic improvement research. It was of great significance to systematically reveal the quantitative trait loci (QTL) and its molecular regulatory network that controled the panicle phenotype for rice high-yield breeding. Using 208 chromosome segment substitution lines (CSSLs) constructed by Changhui 121 and Koshihikari, QTLs for panicle length, primary branch number and secondary branch number were mapped under two environments (Nanchang City, Jiangxi Province in 2021 and Sanya City, Hainan Province in 2022). A total of 19 QTLs for panicle traits were mapped on chromosomes 1-6,8,11 and 12, respectively. The phenotypic contribution rate of a single locus was 3.94%-10.51%. Among them, qPL-8, qPNB-2-2 and qSNB-12 could be repeatedly detected in both environments. The phenotypic identification of four CSSLs (CSSL50, CSSL125, CSSL187 and CSSL205) at qSNB-12 locus showed that this locus had a stable additive effect.

Key words: rice (Oryza sativa L.), chromosome segment substitution lines, panicle traits, quantitative trait locus(QTL), stability, different environments

CLC Number:

S511

SUN Xiao-xuan, CHEN Chu-chu, WANG Chuan-zhi, WANG Xiao-lei. QTL detection and stability analysis of rice panicle traits in different environments[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(1): 7-11.

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