Variation of Rachis Branches, Grain Ripening and Grain Weight by Grain Setting Site in Japonica Rice
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Abstract
This study was carried out to analyze the varietal diference of panicle traits and to select for desirable panicle structureto simultaneously increase sink size and ripened grain ratio. Diferent nitrogen levels, planting densities and planted seedling num-bers in four diferent panicle types of japonica rices were applied. The number of primary rachis branch (PRB) per panicle was(SRB) per panicle and PRB was most in Dongjin#1, medium in Sindongjinbyeo and Saegyehwabyeo and fewest in Iksan467. Theratio of grain number seting on PRB to total grain number per panicle was in order of Iksan467 > Sindongjinbyeo> Saegyehwabyeo > Dongjin#1. The usable criteria for the desirable panicle structure was the number of SRB per PRB whichshowed the significant varietal diference but did not showed the environmental diference. To maintain over 90% of ripened grainratio, it was required to keep 130 or fewer grains per panicle, 2 or fewer SRBs per PRB, 5.5 or fewer grains seting on SRB perPRB and 57% or higher ratio of grains seting on PRB to total grains per panicle. Both 1,000-grain weight of brown rice and rip-ened grain ratio decreased more in grains setting on SRB, especially SRB positioned near the rachis base, than those on PRB.
참고문헌 (14)
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