sporophytic versus gametophytic
forms of self-incompatibility


sporophytic SI               gametophytic SI 

outcome of pollen tube and        outcome of pollen tube and
style interactions determined     style interaction determined
by the genotype of diploid        by the genotype of the
sporophyte that produced the      pollen itself
pollen

pollen tube growth arrested       pollen tube growth arrested
on surface of stigma              in the style

S-allele produced before         S-allel produced after
completion of meiosis             meiosis


expression of S-allele

sporophytic self-incompatibility
sporophytic SI















gametophytic self-incompatibility
gametophytic SI>





















post-pollination comparison
comparison of GSI and SSI



































pollen tube growth gameotophytic-type
pollen tube growth in G-type




























:: Newbigin et al., 1993: p. 1318 :: Newbigin et al., 1993: p. 1317 :: Kao and McCubbin, 1996: p. 12060 ::