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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, JAS
Pereira, MFDA
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.
Subject: Helianthus annuus
floral initiation
floral apex analysis
Country: Holanda
Editor: Kluwer Academic Publ
Citation: Plant Growth Regulation. Kluwer Academic Publ, v. 19, n. 2, n. 109, n. 115, 1996.
Rights: fechado
Identifier DOI: 10.1007/BF00024576
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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