Study On Relationship Between Panicle Characters And Yield Of Different Panicle Type Japonica Rice In Cold Area

Panicle weight of cold japonica rice is classified into three types, Light panicle type, Middle panicle type, Weight panicle type, Song06-307,dongnong416,hexuan 99-7 are Selected as light panicle type, longjing26,kendao12,qingxi102 were Selected as Middle panicle type, Longdun02-72, Longjing18, Hexuan99-1are Selected as Weight panicle type. The test studied that grains density, number of panicle grains, number of primary and secondary branches, grains of primary and secondary branches, large,small vascular bundles in neck, seed setting rate,1000-grains weight, number of effective panicle and yield. The results show that:Grains density of different panicle show that:Weight panicle type>Middle panicle type> Light panicle type, grains density with regard to yield Certain influence, within a certain range, the yield increased with the density increase.The number of mean grains of Primary and second branch that different panicle type japonica rice in cold area have no significant differences, grains stabilizing, primary branch grains are 5-6 Stable, second branch grains are 3, is relatively stable genetic traits.The difference of grains per panicle is very significant in cold area japonica rice, Weight panicle type>Middle panicle type>Light panicle type, Primary branches grains have reached a significant difference in different panicle type, Secondary branch grains have reached the difference highly significant, Secondary branch grains difference is caused by differences among different panicle grain numberPrimary branches and panicle large vascular bundles positive significant correlation with panicle size of the secondary vascular bundle branch showed positive significant correlation. Different panicle type of vascular bundles in the panicle were highly significant differences, show that:Weight panicle type>Middle panicle type>Light panicle type.Panicle seed setting rate significantly difference, as follow:Weight panicle type>Middle panicle type>Light panicle type., the setting rate of the primary branch was not significant, primary and secondary branches are significant difference. Seed setting rate of secondary branch and seed setting rate are positively related, secondary branches seed setting rate of heavy panicle varieties increased seed setting rate more apparently.1000-grains weight difference of a primary and secondary branches were significantly different, the difference was:Weight panicle type>Middle panicle type>Light panicle type. Grain density, number of grains and panicle weight are primary and secondary branches grain weight difference was significant positive correlation.Number of effective panicle per unit area was a negative linear with weight per panicle. Rice panicles per unit area there are significant differences, as follows:Weight panicle type> Middle panicle type>Light panicle type.Spike the smallest variation within species; light panicle and the ear is similar variation range.In the yield model, light panicle varieties can achieve high yield by increasing panicle weight, while weight panicle varieties can achieve high yield by panicle weight,and panicle number per unit area.