Identification of QTL for growth- and grain yield-related traits in rice across nine locations of Asia
文献类型: 外文期刊
第一作者: Hittalmani, S
作者: Hittalmani, S;Huang, N;Courtois, B;Venuprasad, R;Shashidhar, HE;Zhuang, JY;Zheng, KL;Liu, GF;Wang, GC;Sidhu, JS;Srivantaneeyakul, S;Singh, VP;Bagali, PG;Prasanna, HC;McLaren, G;Khush, GS
作者机构:
关键词: common QTL;locations;G x E interaction;molecular markers;rice;yield traits
期刊名称:THEORETICAL AND APPLIED GENETICS ( 影响因子:5.699; 五年影响因子:5.565 )
ISSN: 0040-5752
年卷期: 2003 年 107 卷 4 期
页码:
收录情况: SCI
摘要: Rice double-haploid (DH) lines of an indica and japonica cross were grown at nine different locations across four countries in Asia. Genotype-by-environment (G x E) interaction analysis for 11 growth- and grain yield-related traits in nine locations was estimated by AMMI analysis. Maximum G x E interaction was exhibited for fertility percentage number of spikelets and grain yield. Plant height was least affected by environment, and the AMMI model explained a total of 76.2% of the interaction effect. Mean environment was computed by averaging the nine environments and subsequently analyzed with other environments to map quantitative trait loci (QTL). QTL controlling the 11 traits were detected by interval analysis using MAPMAKER/QTL. A threshold LOD of greater than or equal to3.20 was used to identify significant QTL. A total of 126 QTL were identified for the 11 traits across nine locations. Thirty-four QTL common in more than one environment were identified on ten chromosomes. A maximum of 44 QTL were detected for panicle length, and the maximum number of common QTL were detected for days to heading detected. A single locus for plant height (RZ730-RG810) had QTL common in all ten environments, confirming AMMI results that QTL for plant height were affected the least by environment, indicating the stability of the trait. Two QTL were detected for grain yield and 19 for thousand-grain weight in all DH lines. The number of QTL per trait per location ranged from zero to four. Clustering of the QTL for different traits at the same marker intervals was observed for plant height, panicle number, panicle length and spikelet number suggesting that pleiotropism and or tight linkage of different traits could be the possible reason for the congruence of several QTL. The many QTL detected by the same marker interval across environments indicate that QTL for most traits are stable and not essentially affected by environmental factors.
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