บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effects of gibberellic acid on the harvest and storage quality of Florida citrus fruit.

Ritenour, M. A.; Stover, E.;

Proceedings of the Florida State Horticultural Society Year: 1999, publ. 2000 Issue: No. 112 Pages: 122-125 Ref: 14 ref.

2000

บทคัดย่อ

Effects of gibberellic acid on the harvest and storage quality of Florida citrus fruit.

Studies were conducted in Loxahatchee, Florida (USA), during 1998-99 to investigate the effects of early (October) or late (November or December) preharvest gibberellic acid (GA) application (with or without the surfactant 0.05% Silwet L-77) on harvested fruit quality and quality retention during storage of Fallglo and Sunburst tangerine (both complex mandarin hybrids), Minneola tangelo (hybrid of Citrus paradisi x C. reticulata), and Marsh grapefruit (C. paradisi). GA was applied at 23 ppm to tangerine and tangelo, and at 12 ppm to grapefruit. Fruits were degreened with ethylene for up to 24 hours. All fruits were washed, waxed and stored at 50 deg F (10 deg C) to simulate commercial handling. Early application of GA <plus> Silwet resulted in significantly greener fruit in all cultivars tested. Effects on green colour retention were less apparent when GA was applied alone or late, although significant differences to controls were occasionally observed. Early treatments of GA <plus> Silwet resul

ted in fruits with significantly greater peel puncture resistance than control fruits. GA <plus> Silwet applied late increased peel puncture resistance of Fallglo and Sunburst tangerines. Total soluble solids (TSS), titratable acids (TA) and TSS:TA ratio were not significantly affected by the GA treatments except in Minneola, where only the early GA <plus> Silwet treatment significantly reduced TSS (10.50 deg Brix, compared to 11.10 deg Brix in the control) and the TSS:TA ratio (9.62, compared to 11.52 in the control) at harvest. GA <plus> Silwet treatments reduced postharvest pitting of Fallglo after 1 week of storage, but GA effects disappeared as storage time and pitting severity progressed. Postharvest pitting was minimal or not detected in the other cultivars. Despite the greater peel strength, there were no cases where GA treatments significantly reduced postharvest decay or disorders, other than postharvest pitting.