水稻远缘杂种F2一个不分离株系的小孢子发育过程

水稻远缘杂种Ｆ_２一个不分离株系的小孢子发育过程赵世绪，凌祖铭，杜中（北京农业大学，北京１０００９４）关键词：小孢子发育；无融合生殖；远缘杂种ＭｉｃｒｐｓｐｏｒｅＤｅｖｅｌｏｐｍｅｎｔｏｆａＩｎｔｅｒｓｐｅｃｉｆｉｃＨｙｂｒｉｄＦ_２Ｎｏｎｓｅｇｒｅｇ...

Micrpspore Development of a Interspecific Hybrid F_2 Nonsegregated Rice Line

Rice 603 is a line derived from an interspecific hybridization:Oryzasativa/O. longistaminata.There was no segregation in F3 of this line. Line 461 is a descendant of a compound cross of 603 with a F1, and no segregation was found since F2. The nonsegregation of these two lines suggested the possibility of apomixis in their embryo development. The adventitious embryos were found in less than 10% of the examinated pistils of 603 and 461. There were abnormal numbers of bivalents in diakinesis of the PMCs: 3. 6. 8. 9. 10. 11 bivalents instead of 12. Micronucleus were observed in tetrads, microspores and in mature pollen grains of both 603 and 461 lines.It seems reasonable to suppose that the abnormal sperms induce the purthenogenesis of egg cell during self-pollination in both 603 and 461 lines.