Comparison of Grain Chalky Characters in Different Positions between Two Type Panicles of Japonica Rice

With typical japonica cultivars with erect panicle and curved panicle as the materials,the difference in appearance qualities of rice grains and their position distributions within a panicle between two types panicle of japonica rice were researched.The results showed that panicle types of japonica rice had no direct correlation with chalky grain percentage(CGP),chalkiness degree(CD)and transparence degree(TD)in the grains between the six japonica cultivars tested.All primary branches on a panicle were divided into three parts of the upper,middle and basal.The grains were numbered as 1 to 6 on a primary branch and 1 to 3 on a secondary branch from the top to base.Generally,CGP and CD on the branches at the basal part of a panicle exhibited the greatest,at the middle part the middle,and at the upper part the least.CGP and CD for the grains on a secondary branch were greater than those on a primary branch at the same part of a panicle.TD was just the opposite.CGP and CD for the grain 1,5 and 6 on the primary branches showed the lowest,the grain 2 and 3 the highest.CGP and CD were the least for the grain 1 and the greatest for the grain 2 on a secondary branch within a panicle.Type panicle of japonica rice was not directly related to appearance qualities of cultivar.The variation in appearance qualities of different grains within a panicle was closely related to the flowering order of rice grains on the rachis branches.