Comparisons of RVA Profile Characteristics of Grains at Different Positions of Panicle between Erect Panicle Type and Curved Panicle Type of Japonica Rice

Under the field conditions,three japonica cultivars with erect panicle and three japonica cultivars with curved panicle were applied to compare the difference in RVA profile characteristics of rice grains at different positions in two different panicle type.Results indicated panicle types of japonica rice had no direct correlation with RVA profile characteristics of rice cultivars tested,difference of RVA profile characteristics in the grains at the different parts of panicle and order of its grain positions.The variation in RVA profile characteristics of grains at the different positions within a panicle was closely related to the flowering order of rice grains on the rachis branches.The similar trends of starch viscosity characteristics could be seen for two panicle type rice cultivars,in which starch viscosity characteristics for the grains on a primary branch and at top part were better than those on a secondary branch and at bottom part.The significant difference was found in RVA profile characteristics among grains located on different rachises(primary and secondary rachises) and panicle position,i.e.top,middle,and bottom in rice cultivars.