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Type: Artigo de periódico
Title: The Control Of Flower Initiation By Gibberellin In Helianthus Annuus L. (sunflower), A Non-photoperiodic Plant
Author: Almeida J.A.S.
Pereira M.F.D.A.
Abstract: The involvement of gibberellins in the control of flowering of sunflower was studied by direct application of GA 3 to the apex of the plants, analysis of the endogenous levels of gibberellin-like substances at different plant ages, and indirectly by the application of paclobutrazol, an inhibitor of gibberellin synthesis. GA 3 speeded-up flower initiation and floral apex development. The time of GA 3 application was more critical than the amount of GA 3 applied. The endogenous levels of gibberellin-like compounds increased significantly by day 15 after sowing. The application of paclobutrazol markedly delayed floral initiation and this effect was also dependent on plant age. Both GA 3 and paclobutrazol had their greatest effects between 10 and 20 days after sowing suggesting that an increase in gibberellins in that time period plays a role in floral initiation.
Rights: fechado
Identifier DOI: 
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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