ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

The stress responses of Dendrobium ‘Big White Jumbo’ during modified atmosphere storage

Sjkanat Manuwong, Afiradee Uthairatanakij, Pongphen Jitareerat, Sirichai Kanlayanarat, Kullanart Obsuwan and Asira Fuongfuchat

Abstracts Book, 6th International Postharvest symposium, 8-12 April 2009, Antalya, Turkey. 256 pages.

2009

บทคัดย่อ

The aim of this study was to characterize the effect of packaging on the antioxidative system of Dendrobium inflorescences ‘Big White Jumbo’. Inflorescences were obtained from exporting company orchard, harvested at commercial maturity. Stem-end were re-cut and put in plastic tube containing distilled water, then packed in polypropylene bags or active bags and kept at 13°C for 5 days. Activities of catalase (CAT), peroxidase (POD), ACC oxidase (ACO), malondialdehyde content, proline content and moisture content of florets were determined. It was found that active bag increased CAT and POD activities compared to polypropylene bag. The activities of CAT and POD of opened flower were higher than bud flower. Conversely, flower bud had higher ACO activity than opened flower. Column of flower showed the higher activities of POD and ACO than petal. Malondialdehyde content slightly decreased after storage at 13°C for 5 days in both packaging. Neither polypropylene nor active bags affect moisture content in both bud and opened flowers. Proline content of flower packed in active bag was slightly higher than that stored in polypropylene, but the accumulation of proline was lower in opened flower. It is proposed that the induction of CAT and POD or decrease in ACO activity can be observed before the onset of flower senescence.