BIOL 209 Lecture Notes - Lecture 5: Chromosome, Symbiosis, Basidium
Document Summary
Teliospores initially start out as dikaryotic (cid:894)n+n(cid:895), (cid:449)hi(cid:272)h (cid:373)ea(cid:374)s there"s t(cid:449)o haploid nuclei in one cell. They then undergo karyogamy, which is nuclear fusion (nuclear marriage) which will make the teliospore diploid (2n) Then it goes through a dormancy period (winter) After the dormancy, the teliospore turns into basidium. The nucleus migrates to the basidium and meiosis occurs = 4 nuclei genetically variable. 4 new basidiospores created, which get dispersed in the air. It could die: or it could land on the correct host leaf and use the stored energy in the basidiospore to germinate and form parasitic hypha on the host plant. Some plant genotypes are resistance to rust. In contrast to rust, the basidia in agaricomycotina are aseptate: one of the large differences is that agaricomycotina are rarely biotrophic parasites. Basidium start off as dikaryotic, then fuse to be a diploid.
