The Difference of QTL for Morphological Traits of Rice Flag Leaf by High-density Genetic Map in Two Different Environments
Received date: 2023-11-30
Online published: 2024-11-19
The flag leaf morphological traits are one of the important factors that constitute the ideal plant type in rice. Exploring new genetic resources that control the flag leaf morphological traits is one of the important ways to increase rice yield. In this study, quantitative trait loci (QTLs) were detected for flag leaf length (FLL), flag leaf width (FLW), flag leaf area (FLA), and flag leaf length to width (FLLW) of a population of recombinant inbred lines (RIL) derived from a cross between the Indian japonica rice variety M494 and China indica variety Zhong 9B (Z9B) planted at Hangzhou and Hainan using high-density genetic map. A total of 10 QTL were detected including one QTL for flag leaf length, four QTL for flag leaf width, four QTL for flag leaf area and one QTL for flag leaf aspect ratio, distributed on chromosomes 4, 7, 8, 9 and 10, which could explain 6.47%-13.28% of the phenotypic variation. Two pleiotropic QTL intervals were identified, and the locus was located between Block536 and Block544 on chromosome 4 which were simultaneously controlled FLW and FLA, and the locus between Block942 and Block961 on chromosome 10 simultaneously controlling FLW and FLLW, with phenotypic variation were 8.82%, 13.28%, 12.28% and 12.60%, respectively. The QTL varied greatly between the two sites, with QTL controlling flag leaf width and flag leaf area only simultaneously position in Block536-Block544 and QTL controlling flag leaf width and flag leaf length to width only in the Block942-Block961 interval.
Key words： rice; flag leaf morphology; RIL; high-density genetic map; QTL mapping
WANG Xingyu, WANG Jing, XU Qun, ZHANG Mengchen, WANG Shan, SUN Yanfei, WEI Xinghua, YANG Yaolong, GUO Xiaohong, FENG Yue . The Difference of QTL for Morphological Traits of Rice Flag Leaf by High-density Genetic Map in Two Different Environments[J]. China Rice, 2024 , 30(6) : 29 -34 . DOI: 10.3969/j.issn.1006-8082.2024.06.005
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