04020nab a2200289 i 4500003000900000005001700009008004100026040001800067072001400085072000800099100004300107100003700150100003200187100003300219100002700252245012100279500006700400520135600467520156701823650001303390650001803403650002903421650001203450650001803462773017203480856007803652BR-BrBNA20251218111120.0251218b2021    bl.|r|pooa||| 00| 0 eng |  aBR-BrBNAbeng  aF01b0710  aJ11  aAmarante, Cassandro Vidal Talamini do   aSilveira, João Paulo Generoso   aFreitas, Sergio Tonetto de   aSteffens, Cristiano André   aMitcham, Elizabeth J.   aFruit quality of ‘Braeburn’ apple trees sprayed at post-bloom and preharvest with prohexadione-calcium and GA4+7  a
Publicação online; 11 ref.; 3 illus.; Summaries  (En, Pt)  a


Abstract –      The objective of this study was to assess the effects of post-bloom (PB) or preharvest (PH) treatments of ‘Braeburn’ apple trees with prohexadione-calcium (ProCa; 300 mg L-1), an inhibitor of gibberellins biosynthesis, or GA4+7 (300 mg L-1) on fruit quality at harvest and after storage (four months at 0±0.5 o C, followed by five days of shelf life). PB treatments started 15 days after full bloom, with one application every week and six applications in total. PH treatments started five weeks before anticipated harvest, with one application every week and four applications in total. Control trees were sprayed with water. GA4+7 PB increased length/diameter ratio, and GA4+7 PH increased titratable acidity (TA) and flesh firmness and slightly reduced red color of the fruit at harvest. ProCa PB and PH reduced ethylene production rate, delayed starch degradation and reduced soluble solids content of the fruit at harvest, and ProCa PH maintained firmness at harvest and after storage and TA of the fruit after storage. ProCa PB or PH delayed the loss of skin green background color at harvest, while at both treatment timings reduced the development of skin red color, but with a much stronger effect when sprayed PH than PB.


Index terms:       anti-gibberellin, ethylene, Malus domestica Borkh, maturity, skin color  a


Resumo -      O objetivo deste trabalho foi avaliar os efeitos dos tratamentos em pós-floração (PF) ou pré-colheita (PC) de macieiras ‘Braeburn’ com prohexadiona-cálcio (ProCa; 300 mg L-1), um inibidor da biossíntese de giberelinas, ou GA4+7 (300 mg L-1), na qualidade dos frutos na colheita e após o armazenamento (quatro meses a 0±0,5 o C, seguido por cinco dias de vida de prateleira). Os tratamentos PF começaram 15 dias após a plena floração, com uma aplicação a cada semana e seis aplicações no total. Os tratamentos PC começaram cinco semanas antes da previsão de colheita comercial, com uma aplicação por semana e quatro aplicações no total. Plantas controle foram pulverizadas com água. GA4+7 pulverizado em PF aumentou a relação comprimento/diâmetro, e GA4+7 pulverizado em PC aumentou a acidez titulável (AT) e a firmeza de polpa, e causou leve redução na cor vermelha dos frutos na colheita. ProCa, pulverizado em PF e PC, reduziu a taxa de produção de etileno, o índice de iodo-amido e o teor de sólidos solúveis dos frutos na colheita, e ProCa pulverizado em PC aumentou a firmeza de polpa na colheita e após o armazenamento, e a AT dos frutos após o armazenamento. ProCa, pulverizado em PF e PC, retardou a perda da cor de fundo (verde) e o aumento na cor vermelha dos frutos na colheita, porém com maior efeito ao ser pulverizado em PC do que em PF.


Termos para indexação:       anti-giberelina, etileno, Malus domestica Borkh, maturação, cor da epiderme.  aMAÇÃ  aMATURAÇÃO  aREGULADOR DE CRESCIMENTO  aETILENO  aARMAZENAMENTO0 0805dJaboticabal-SP Sociedade Brasileira de Fruticultura 1978o2024-3612tRevista Brasileira de Fruticultura (Brazil)x0100-2945gv. 43(1) p. 1-6; (2021)wBR2025004760  uhttps://www.scielo.br/j/rbf/a/fNGdNW7V5Mcgw7Ts9WZpysc/?format=pdf&lang=en