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Gibberellins: Synergy and Antagonism.

Gibberellins also affect the length of the internodes by stimulating cell elongation. Auxins and gibberellins work synergistically in the growth of stems. ABA and gibberellins work antagonistically in the germination of seeds.Many varieties of dwarf plants exist where gibberellin is not synthesised. Gibberellins also stimulate bolting - the sudden growth of flowering and biennial plants.

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Specification: OCR Biology A (H420), A-level, 5.1.5 Plant and animal responses. Topic: Plant Responses.

Key terms in this lesson

Auxin
A plant hormone, produced mainly at shoot and root tips, that stimulates cell elongation and controls tropisms and apical dominance.
Gibberellin
A plant hormone that stimulates stem elongation and the breaking of seed dormancy and germination.
Abscisic acid
A plant hormone that maintains dormancy and causes stomatal closure in response to water stress.

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