Gibberellins
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Gibberellins stimulate shoot elongation, break seed dormancy in species requiring cold or light exposure, and promote fruit maturation.
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Treating seedless grapes with gibberellin increases fruit size and loosens clustering, since the seeds that would normally supply it are absent.
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Ethylene, covered next, acts independently of gibberellin, triggering fruit ripening and abscission rather than further elongation.