The relationships among abscisic acid, gibberellins and internal browning of pineapple
Issaya Pusittigul, Satoru Kondo, Jingtair Siriphanich
Abstracts of 7th International Postharvest Symposium 2012 (IPS2012). 25-29 June, 2012. Putra World Trade Centre (PWTC), Kuala Lumpur, Malaysia. 238 pages.
2012
บทคัดย่อ
The changes in endogenous hormones [abscisic acid (ABA) and gibberellins (GAl, GA3 and GA4)] concentrations and polyphenol oxidase (PPO) activity were investigated in Queen and Smooth cayenne pineapples during storage at 10°C for 21 days and transferred to 25 °C for 1 day to elucidate the relationship of endogenous hormones and internal browning (IB). In both pineapple types, the increases in PPO activity were correlated with IB which was highest observed in fruit stored at 10°C for 21 days and transferred to 25 °C for 1 day. ABA concentrations were significantly increased during storage at 10 °C and immediately decreased after transferred to 25°C in both cultivars, while total GA (GAI+GA3+G~) concentrations were significantly increased after transferred to 25°C. However, Queen pineapples had higher endogenous ABA and total GA concentrations and developed more IB than that in Smooth cayenne pineapples. In addition, pineapples treated with 150 mg/L gibberellic acid (GA3) for 5 min induced flesh browning and activity ofPPO in both pineapples types during storage at non-chilling temperature (25°C). External GA3 had no effect at 10°C. However, GA3 application significantly induced higher endogenous ABA concentration in queen pineapple at 25°C. It was suggested that the change in balance of endogenous hormones concentrations may be one of factors influencing IB in pineapples.