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#cotyledons

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plant Development - 1

Cotyledons formed during:

Cotyledons represent first embryonic leaves formed during heart stage when auxin maxima at apical margins trigger localized outgrowth from globular mass converting to bilateral symmetry. During this transition globular embryo converts to triangular heart morphology with two bulging primordia containing emerging provascular strands and accumulating storage products. Cotyledon formation involves coordinated action of PIN1-dependent auxin transport creating convergence maxima, CUC boundary genes establishing separation, and LEC regulators promoting maturation. Their emergence during heart stage establishes photosynthetic and nutritional support organs essential for seedling survival and reflects successful bilateral patterning and lateral organogenesis program.

Ref: Goldberg et al., Science 1989: cotyledons formed during heart stage transition to bilateral symmetry in Arabidopsis embryogenesis.

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plant Development -ll

Primary function of cotyledons:

Cotyledons are embryonic leaves formed during heart stage transition from radial to bilateral symmetry via localized auxin maxima at apical margins mediated by PIN1 convergence points. They accumulate storage compounds including triacylglycerols, cruciferin proteins, starch, and late embryogenesis abundant proteins providing essential nutrition during germination before true leaves become photosynthetically competent. Enclosing shoot meristem they protect SAM during seed desiccation and dormancy. Number and fusion status sensitive to auxin patterning governed by GNOM, PINOID, and GURKE lipid pathways, making cotyledon morphology key readout of embryonic patterning fidelity.

Ref: Goldberg et al., Science 1989; Gilbert Plant Development, Chap 20: cotyledons provide nutrient support for germination.

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