Figure 6

Early embryo development of Agave tequilana Weber. a) Zygote and early endosperm development. Bar = 10 μm. b) Formation of the chalazal haustorium (curved arrows) Bar = 50 μm. c) Formation of the micropylar haustorium. Bar = 25 μm. d) First division of the zygote showing the apical and basal cells of the early embryo. Bar = 25 μm. e) and f) Immature seed showing the micropylar haustorium and the chalazal haustorium including the postament. Bar in e = 100 μm and Bar in f = 200 μm. ch = chalaza, m = micropyle, zy = zygote, zyn = zygote nucleus, eni = endosperm nuclei, p = postament, mh = micropylar haustorium, chh = chalazal haustorium, en = endosperm nucleus, s = synergid, bc = basal cell, ac = apical cell. Curved arrows = haustoria pushing towards the chalaza, arrowheads = endosperm chambers. (for more detail, see close-up in Additional file 2: Figure S5).