Figure 3

Megagametogenesis of Agave tequilana Weber. a) Functional megaspore with the rest of the degenerated megaspores. Bar = 20 μm. b) Two nuclei resulting after a first mitotic division of the functional megaspore. Bar = 20 μm. c) Four-nuclei state after a second mitotic division. Bar = 20 μm. d) Eight-nuclei state forming a multinucleate coenocyte after the third and last mitotic division. Bar = 20 μm. ch = chalaza, hi = hypostase, m = micropyle, fm = functional megaspore, dm = degenerating megaspores, cpn = chalazal polar nucleus, mpn = micropylar polar nucleus, cni = chalazal nuclei, mni = micropylar nuclei. Arrowheads = eight final nuclei.