Alnus cremastogyne Burk and A.formosana belong to the Alnus Betulaceae.There were little research on those genetic improvement. In order to meet the increasing requirement of wood production in China, it is necessary to make a genetic improvement program on A.cremastogyne and A.formosana.Meiosis of pollen mother cells (PMCs), megaspore mother cells (MMCs), development process of embryo sac and chromosome doubling of pollen of A.cremastogyne and A.formosana were studied.
PMCs started to meiosis d...