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KMID : 0381120080300040337
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Genes and Genomics
2008 Volume.30 No. 4 p.337 ~ p.346
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Time-related Mapping of Quantitative Trait Loci Controlling Dry Matter Accumulation and Partitioning in Rice
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Li Shao-Bo
Zhang Zhi-Hong
Li Shao-Qing
Li Yang-Sheng
Zhu You-Lin
Zhu Ying-Guo
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Abstract
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Grain yield is a result of dry matter accumulation and partitioning in rice (Oryza sativa L.). To characterize the genetic basis of dynamics of traits representing dry matter accumulation and partitioning as well as their relationships with each other, composite interval mapping of quantitative trait loci (QTL) was conducted based on time-related phenotypic data obtained from a population of 258 recombinant inbred lines (F12), which was derived from a cross between Lemont (japonica var.) and Teqing (indica var.). A total of twenty-three QTL were identified for leaf weight, stem weight and panicle weight at four measuring stages after heading. However, these three dynamic traits were observed to be controlled by different QTL (genes) at different growth stages. An extreme example was that at least three types of QTL (genes) might be involved in the development of panicle weight. Growth duration, which is closely related to dry matter accumulation and partitioning, was also identified to be significantly affected by four QTL. The close correlations among the studied four traits were explained to some extent by six co-located QTL. Nevertheless, it would be of great importance to distinguish the pleiotropic or linked effects of the co-located QTL. In addition, the chromosome regions or QTL identified in this study were compared with those previously reported for the same or related traits with the same RIL population.
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KEYWORD
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rice (Oryza sativa L.), dry matter accumulation and partitioning, time-related QTL mapping, genetic correlation
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