Abstract
Rice (Oryza sativa L.) is a major food for more than half of the world’s population and serves as a model monocot plant. DEP1 (dense and erect panicle 1), corresponding to an erect-panicle architecture, may bring the third breakthrough in rice breeding after the introduction of the semi-dwarf trait and the application of heterosis in hybrid rice. The aim of this study was to determine the effects of DEP1 on yield components and vascular bundle-related traits under indica and japonica genetic backgrounds. We analyzed a series of recombinant inbred lines, which were derived from a cross between the japonica variety SN265 with an erect panicle and the indica variety R99 with a curved panicle. The results showed that effects of the DEP1/dep1 allele were much stronger than the effects of the indica/japonica genetic background on vascular bundle-related traits and yield components. As the frequency of indica alleles increased, the grain yield per plant and the harvest index significantly increased in lines with the dep1 allele. Among the indica-type lines, those with the dep1 allele showed superior values for almost all of the vascular bundle-related traits and yield components. Our results provide new insights into the use of a high-yield-related gene derived from japonica in the indica genetic background.
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