The Research Progress on Erect Panicle Type of Rice

The physiological and ecological properties of different panicle type rice were overviewed,the different panicle function,charˉacter and heredity were also surveyed.It showed that the panicle had little photosynthetic capacity and posited as non-assimilating organ.The rate of maturity and seed weight of the erect panicle type detracted obviously when the intensity of illumination weakened,and they were lower than the curved one.The reason of low seed rate of erect panicle was the second ramifications'seed rate being lower relatively.Higher seed ratio in the first ramifications and the spike-stalk of the second ramifications was important for more seeds on panicles.Rice panicle type is controlled by major nuclear genes,which can be divided into two types,dominance and recesˉsives.The gene of erect panicle type has certain pleiotropism,which can be interrelated to the properties variation.The illumination,temperature,humidity and concentration of CO 2 in the erect panicle type population are superior to the curved one,and the LAI has relatively slower attenuation in the anaphase and has a longer high CAP period.So the erect panicle type population has a bigger dry material production capacity and higher biological yield,these are the physical basis of high economic yield.