高频率无融合生殖水稻的研究

THE STUDY OF HIGH FREQUENCY OF APOMICTIC RICE MATERIAL(HDAR)

A new rice material with high frequency of apomixis(HDAR)was reported in this paper.This material has the ollowing characteristics:(1) It was derived from a crosstreated with a special method.(2) Embryo was formed utonomously in the unfertilized ovules.Globular embryo,two polar nuclei and antipodal cell mass could be observed n the embryo sacduring 1 to 2 days before and after anthesis.(3) They showedhigh frequency of apomixis:HDAR 001 as 48%,HDAR 002 was 50%.(4) Various abnormal seedlings were obtained e.g.seedlings from seeds without ndosperm,those germinated form some where in the middle ofseeds,seedlings germinated from opposite end of eeds,those from latteral side of the seeds,thosefrom small seeds,and those from thin and long seed.(5) Their hromosome number of root tipwas diploid,2n=2x=24. Moreover,they showed normal seed setting rate:HDAR 001 was80% and HDAR 002 ranged from 58% to 85%.In comparison with other apomictic ricematerials,such as olyembryonic rice,SAR-1,parthenogenesis material direved from malesterile line and plant from endosperm ulture,HDAR is a new superior apomictic rice material.