Fig. 1. PMC's and young pollen grains
showing intermeiocyte connections and cytomixis
- A normal
PMC of R. tsukushiensis x P. huashanica hybrird has
28 chromosomes.
- PMC a and
PMC b contacting each other and forming a big opening or being
somewhat fused. The number of anaphase chromosomes distributed in
these two cells is unequal. Anaphase chromosomes also show non-
synchronous separation. In cell a, there are 9 anaphase
chromosomes with 7 chromatids; in cell b, there are 2 anaphase
chromosomes with 3 chromatids.
- Two
chromonema stage PMCs contacting each other, and chromonemata
migration just taking place through conjugation
opening.
- Cell a has
two separate synchronous nuclei at chromonema stage; cell b with
small cell size has only one chromosome and two chromatids; cell
c, two chromosonema stage nuclei mixed together. A nucleus has
twice as many chromosomes as the usual one; a bud-like structure
has a micronucleus.
- The resting
stage nuclei are just migrating through conjugation opening
(arrow) between two young pollen grains, and they have germ pore
on their thick walls.
- The focus
section of the conjugated pollen grains shows the structure of
opening (arrow) very clearly.
- Chromonemata
is just migrating through conjugation opening (arrow) at young
pollen grain stage.