Abnormalities of female gametophyte development in apomictic bluegrass forms

The structure of female gametophytes was studied at different developmental stages in apomictic bluegrass forms (Poa badensis Haenke, P. chaixii Vill., and P. pratensis L.). The range of structural abnormalities of undifferentiated and mature embryo sacs has been described. Possible mechanisms underlying their appearance are discussed and schematic linear arrangement of differentiation zones in the embryo sac are considered.