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Fig. 4 | Plant Methods

Fig. 4

From: Refinement of a clearing protocol to study crassinucellate ovules of the sugar beet (Beta vulgaris L., Amaranthaceae)

Fig. 4

Schematic diagram depicting the structure of the crassinucellate ovules of Beta vulgaris at different developmental stages. a Ovule at pre-fertilization stage with a mature embryo sac; the dotted line indicates a haustorium (h), originating from the central cell of the embryo sac; the grey area represents a nucellar cap on the micropylar pole of the ovule. b Ovule at post-fertilization stage with a growing embryo; the bold line represents the developing seed coat; the dotted line indicates the border of the embryo sac. ch, chalazal pole of the ovule; e, embryo with growing cotyledons; en, cellular endosperm; es, embryo sac; f, funiculus; ii, inner integument; n, nucellus; oi, outer integument; p, massive perisperm; vt, vascular tissue

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