Comparison with the Grain Shapes at Different Positions Between Erect Rice Panicle and Curved Rice Panicle Cultivars

Differences in grain shape among the grains at different positions between the cultivars with erect panicle type and the cultivars with curved panicle type were studied.The objective was to investigate the difference of the grain shape in different grains and different grain positions in cultivars with different panicle type.The results showed that the length of grains,width of grains,length-width ratio of grains and length-thick ratio of grain of the curved-panicle cultivars were greater than that with erect panicle type,of which the length of grains reached significant level.Generally,at the same positions of the panicle,the length,width,length-width ratio and length-thick ratio of grains on the primary branches were greater than the grains on the secondary branches in different cultivars with different panicle types.On the one branch,the length and length-thick ratio of grain have connected with the order of blossom,but they were not according to it strictly and varied with the cultivars or planting condition.There have no connected between width,length-width ratio of grains and the time of blossom.There was no significant correlation between the panicle type and grains sequence.So the rice appearance quality of the cultivars with erect panicle type could be improved through selection.