Data/hora: 12/06/2024 09:13:23

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 29/07/2015
Data da última atualização: | 18/05/2023
Autoria: | PEREIRA, M. E. C.; SARGENT, S. A.; HUBER, DONALD J.
Afiliação: | MARCIO EDUARDO CANTO PEREIRA, CNPMF; STEVEN A. SARGENT, University of Florida; DONALD J. HUBER, University of Florida.
Título: | Delayed and prolonged ethylene treatment alleviates firmness asynchrony enhanced by 1-methylcyclopropene exposure in Guatemalan-West Indian avocado.
Ano de publicação: | 2015
Fonte/Imprenta: | Postharvest Biology and Technology, v.108, p. 54-60, 2015.
ISSN: | 0925-5214
Idioma: | Inglês
Conteúdo: | Studies were conducted to determine the efficacy of a delayed and prolonged ethylene treatment in alleviating firmness asynchrony enhanced by 1-methylcyclopropene (1-MCP) exposure in avocado. ?Booth 7? and ?Booth 8? avocados, mid-season cultivars in Florida, were harvested and immersed in water (control) or aqueous 1-MCP at 16.7 mmol L 1 a.i. (900 mg L 1) for 1 min at 20 C; all fruit were held at 20 C/89 2% relative humidity until ripe, based on whole fruit firmness, respiration and ethylene evolution. The effect of delayed and prolonged ethylene treatment was investigated by exposing 1-MCP-treated fruit to ethylene (100 mL L 1) for 2 or 4 d at 20 C upon reaching two progressive ripening stages (120 N or 80 N of whole fruit firmness, respectively). Ripe fruit (10?15 N) from all treatments were assessed for peel color, pulp firmness and polygalacturonase (PG) activity. 1-MCP significantly delayed ripening of ?Booth 7? and ?Booth 8? avocado. Firmness asynchrony was confirmed in control fruit of both cultivars, with a difference of more than 20% in pulp firmness between apical and distal end segments regardless of ripeness stage.1-MCP-treated fruit showed pronounced firmness asynchrony, with pulp firmness for apical end 10-fold higher than for distal end. PG activity was not directly related to firmness asynchrony, since even when strong asynchrony was observed for 1-MCP-treated fruit, PG activity did not differ from control. A 2-d delayed exposure of fruit at either 120 N or 80 N whole fruit firmness to ethylene was not consistently sufficient to promote ripening recovery (in terms of whole fruit firmness). However, a prolonged, 4-d ethylene treatment of fruit at either progressive ripening stages from both ?Booth 7? and ?Booth 8? effectively overcame the pronounced firmness asynchrony caused by 1-MCP treatment.
Thesagro: | Abacate; Maturação; Persea Americana.
Thesaurus Nal: | Avocados; Polygalacturonase; Ripening.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (30735-1) - UPC - AP - DD - Publicação digital -  -  - DIS