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Fig. 8 | Botanical Studies

Fig. 8

From: Asymbiotic germination of Vanilla planifolia in relation to the timing of seed collection and seed pretreatments

Fig. 8

The seed coat development of V. planifolia. a The seed coat consisted of the inner seed coat (IS, two cells thick) and outer seed coat (OS, three to four cells thick). At the time of fertilization, the cell wall of the outermost layer of outer seed coat still remained primary in nature. b At the globular embryo stage, the cell wall of the outermost layer of outer seed coat (OS) had become thickened, and the inner seed coat (IS) was dehydrating and compressing. c As the seed approached maturity, the thickened outermost layer of the outer seed coat had dehydrated and compressed, and the inner layers of the outer seed coat were gradually dehydrating and compressing. At this stage, the inner seed coat (IS) had compressed into a thin layer. d At maturity, both the thin inner seed coat (IS) and the thickened outer seed coat (OS) compressed and enveloped the embryo (E) tightly. Scale bar = 20 μm

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