Microsporogenesis variation in Codiaeum producing inaperturate pollen grain.
A study of microsporogenesis (the earliest stage of pollen ontogeny) was undertaken in seven cultivars of Codiaeum variegatum var. pictum, a eudicot species that produces inaperturate pollen grains. Microsporogenesis appears highly variable for the developmental events suspected to be implicated in the determination of aperture pattern. Most eudicots have tri-aperturate pollen grains and microsporogenesis is described as highly conserved in this clade. The observed burst of variation in C. variegatum therefore appears especially remarkable. A plausible hypothesis to explain the variation is that the pollen being inaperturate, the selective forces applying on the ontogeny of the aperture pattern are relaxed.
Albert
Béatrice
B
Université Paris-Sud et CNRS, UMR, Orsay, France. Beatrice.Albert@u-psud.fr
Gouyon
Pierre-Henri
PH
Ressayre
Adrienne
A
D019665:Euphorbiaceae / Q000033:anatomy & histology* / Q000145:classification / Q000235:genetics*; D008540:Meiosis; D011058:Pollen / Q000033:anatomy & histology