Gibberellic acid and water regime in the flowering induction of Brassocattleya and Cattleya hybrid orchids

Abstract

CARDOSO JC; ONO EO; RODRIGUES JD. 2010. Gibberellic acid and water regime in the flowering induction of Brassocattleya and Cattleya hybrid orchids. Horticultura Brasileira 28: 395-398. Gibberellic acid and water regime in the flowering induction of ABSTRACTThe influence of gibberellic acid (GA 3 ) and water regime was evaluated in the flowering induction and quality of two orchid hybrids belonging to the genera Cattleya (C.) and Brassocattleya (Bc.). The experiment was carried out in the Biotechnology and Orchid Culture Sector of Shunji Nishimura Technology Foundation, Pompéia, São Paulo State, Brazil. Five GA 3 concentrations (0, 125, 250, 500 and 1,000 mg L -1 ) were tested through four consecutive leaf applications in adult plants that had already flowered at least once, besides two water conditions (one and four irrigations per week). Applications were performed in October and November for Bc. Marcella Koss and in January and February for C. Irene Holguin. Flowering could not be induced in the latter by gibberellic acid. In Bc. Marcella Koss, the application of 250 mg L -1 GA 3 combined with decreased irrigation frequency induced flowering in around 83% plants. By using the same GA 3 concentration but frequent irrigation, only 17% plants were induced to flower. The number and size of flowers increased after application of higher GA 3 concentrations. This work allowed developing a commercial technique with the use of gibberellic acid (GA 3 ) to induce flowering in Bc. Marcella Koss hybrid orchid.

Hubungan Antara Fenologi Tanaman dengan Hasil dan Mutu Rajangan Kering Tembakau Temanggung

“…Demikian pula beberapa hasil penelitian menunjukkan bahwa aplikasi GA3 dapat mempercepat pemunculan bunga (Sutisna, 2010;Cardoso et al, 2010).…”

Plant growth of Laelia tenebrosa Rolfe treated with gibberellic acid and grown on different substrates

“…However, higher concentrations of GA 3 (250, 500 and 1000 mg L -1 ) caused a reduction in leaf width of these plants. Studying the effect of five concentrations of gibberellic acid (0, 125, 250, 500 and 1000 mg L -1 ) and two water regimes (one and four irrigations per week) on flowering induction of two hybrids of Cattleya and Brassocattleya, Cardoso et al (2010) found that the concentration of 250 mg L -1 associated with decrease in frequency of irrigation was the most effective treatment for Brassocattleya Marcella Koss, inducing flowering in 83% of the plants. GA 3 at the same concentration, but with more frequent irrigations induced only 17% of the plants to flower.…”

“…Studies have been conducted recently with some species to evaluate the effect of growth regulators, including gibberellic acid (GA 3 ), on the stimulation of shoot growth and reproductive development (Chen et al, 1994;Vichiato et al, 2007;Cardoso et al, 2010;Cardoso et al, 2012); in general good results have been obtained. However, there are no reports of these studies on Laelia tenebrosa, a species native to Brazil and endangered.…”

Gibberellic acid and 6-benzyladenine reduce time to flowering and improve flower quality of Laelia anceps

“…In some cases, its application may be ineffective in inducing flowering, but in long-day plants, gibberellic acid (GA 3 ) may have different effects, depending on the species (Kozłowska et al, 2007). Thus, some reports show that GA 3 is associated with the induction of flowering in several orchid species: Miltoniopsis (Matsumoto, 2006), Brassocattleya (Cardoso et al, 2010) and Phalaenopsis (Cardoso et al, 2012).…”