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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|
|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.|
floral apex analysis
|Editor:||Kluwer Academic Publ|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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