Data/hora: 06/06/2024 09:24:45

Biblioteca(s): 	Epagri-Sede.	
Data corrente: 	25/11/2020	
Data da última atualização: 	25/11/2020	
Autoria: 	AMARANTE, C.; SILVEIRA, J. P. G.; STEFFENS, C. A.; DENARDI, V.; FREITAS, S. T.; KATSURAYAMA, J. M.	
Título: 	Post Bloom Spraying Apple Trees with Prohexadione-Calcium and Gibberellic Acid Affects Vegetative Growth, Fruit Mineral Content and Bitter Pit Incidence.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	In: CONGRESSO LUSO-BRASILEIRO DE HORTICULTURA, 1., 2017, Lisboa, Portugal. Resumos... Lisboa, Portugal: Associação Portuguesa de Horticultura, 2017. p. 400	
Idioma: 	Inglês	
Conteúdo: 	Post bloom spraying apple orchards with prohexadione-calcium (ProCa, an inhibitor of gibberellins synthesis) can reduce vegetative growth and therefore increase calcium (Ca) uptake into the fruit. On the other hand, post bloom spraying with gibberellins (GAs) is used commercially to promote parthenocarpic fruit set and fruit growth, but it can increase vegetative growth and reduce fruit  Ca content. Bitter pit (BP) is a physiological disorder caused by Ca deficiency in apples, also associated with incresead activity of GAs in the plant. This study was carried out to assess the effects of post bloom orchard spraying with ProCa and gibberellic acid (GA3) on vegetative growth, fruit mineral content and BP incidence. The experiment was carried out in southern Brazil. 'Fuji' and 'Catarina' apple trees were sprayed with water (control), ProCa (319 mg a.i. L-1) or GA3 (319 mg a.i. L-1) at the petal fall stage (when shoots were 5-10 cm long), with reapplication 20 days later. During the trial, plants were not sprayed with calcium chloride to encourage the occurrence of BP. In both cultivars, yield and average fruit weight at harvest were not different among treatments, while vegetative growth (lenght of current season shoots) was reduced by ProCa and incresased by GA3 in comparison to the control. In fruit of both cultivars harvested at the commercial maturity and then left in cold storage (0+-0,5 oC/90-95% RH) for four months, followed by five days of shelf life , ProCa reduced while GA3 incresead the incidence (%) of BP in comparison to the control. In bot cultivars, fruit from trees treated with ProCa had higher Ca content and lower (K+Mg+N)/Ca ratio in the peel tissue at the distal end than those from trees treated with GA3. The results show that post bloom spraying with GA3 increases the risk of BP. The inhibition of GAs synthesis by post bloom spraying with ProCa reduces vegetative growth, improves fruit Ca accumulation and reduces the risk of BP.	
Palavras-Chave: 	Anti-gibberellin; Calcium; Fruit; GA3; Malus domestica Borkh; Physiological disorder; Postharvest.	
Categoria do assunto: 	X Pesquisa, Tecnologia e Engenharia	
URL: 	http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_47832.pdf	
Registro original: 	Epagri-Sede (Epagri-Sede)	
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