Abstract
The double haploid (DH) population derived from a typical cross between an indica rice TN 1 and a japonica rice CJ06 was used in this research to investigate the genetic characteristics of length, thickness and dry weight of leaf sheath among individuals of the DH population as well as their parents. The results showed that the sheath length in rice was a trait with high heritability and less environmental impacts, as well the sheath length was demonstrated significantly positive correlation with the sheath thickness and the dry sheath weight. There were 31 QTLs related to the trait of rice sheath to be detected, which were mapping on the chromosome 1, 4, 6, 8, 10 and 11, respectively. The LOD values of these QTLs were in range from 2.58 to 4.81, and the phenotypic variations were in range from 7.5% to 35.3%. The interval of RM548-RM6997 located on chromosome 4 in rice genome was considered as a major effective QTL locus, which might confer the traits of rice sheath length, dry weight of sheath and sheath thickness. Comprehensive comparison was conducted between the sheath-related traits and some yield related traits, the results indicated that photosynthetic function of sheath and or synthetic substance transportation of sheath might be closely related to rice yield formation.
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