Seed germination

Seed germination - Seed germination Internal signals shut...

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Unformatted text preview: Seed germination Internal signals shut off growth of the embryo at a certain size and the seed goes into a period of dormancy . In some plants, dormancy lasts only as long as it takes the seed to be dispersed from the ovary. In others, dormancy may last for long periods until either external or internal signals (or a combination of both) initiate further growth. Environmental factors of chief importance to initiate growth are water, light, and temperature. Seedling growth When an embryo resumes growth, stored food provides the energy for seedling development—the roots first, followed by elongation of the photosynthetic shoots. Eudicot development . Aboveground growth in eudicots takes one of two general patterns: epigeous or hypogeous . In epigeous growth, the hypocotyl elongates, pulling the plumule and cotyledons above ground; in hypogeous growth, the cotyledons remain below ground because the...
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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