Fig. 6

Endosperm development and abnormal seed development of G. littoralis. a, c The developing seed containing endosperm free nucleus. b Early endosperm free nuclei. d Late endosperm free nuclei. e, f The developing seed containing early endosperm cells. g Early endosperm cells. h, i Endosperm cells filled most of the seed. j Late endosperm cells. k-p Longitudinal section of some aborted ovules. q, r, s The morphology of endosperm at various developmental stages. t Early aborted seed. u, v, w, x Some seed abortion phenomena. En: endosperm, em: embryo, se: seed, te: testa, in: integument, es: embryo sac, efn: endosperm free nuclei, ec: endosperm cells, ov: ovule. Scale bar = 100 μm in a, c, k, l, o and p; scale bar = 20 μm in b, d, g, j; scale bar = 200 μm in e, f, h, i, m and n; scale bar = 500 μm in q-s; scale bar = 1 mm in t-x