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Unformatted text preview: Seeds germinate when ABA is degraded by some environmental action. Desert seeds must have the ABA washed out of the seed coat, as do plants of marshy areas; temperate area plants have ABA degraded by light-stimulated enzymes. In other cases breaking dormancy is relative to the ratio of ABA (which keeps seeds in dormancy) and gibberellins (which promote germination). Low levels of ABA in maturing seeds promote premature germination. Mangrove seeds naturally have low levels of ABA and germinate while still attached to the shoot system. Certain mutations affecting ABA synthesis may result in seeds germinating prematurely. Mangrove germination Premature corn germination...
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- Fall '09