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Since throughout history A. sativa has always been selected for grain production, thus requiring regular meiosis to ensure pollen fertility and since A. strigosa has been restricted to forage use, not requiring pollen fertility for its agronomic purposes, the present research compares the efficiency of the meiotic process in varieties of both species, to date under selection for animal fodder. Cytological analyses revealed several different kinds of meiotic abnormalities common to both species, including abnormal chromosome segregation, bridges, and cytomixis among microsporocytes. All varieties of A. sativa (2n=6x=42) were slightly more affected than those of A. strigosa (2n=2x=14). Results suggest that, despite its agronomic use that not requires pollen fertility, A. strigosa does not tolerate aneuploid gametes as a guaranty for species survival.

Microsporogenesis in Brazilian Varieties of Avena sativa and Avena strigosa under Agronomic Forage Selection