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Enhancement of quality criteria in garlic by gamma irradiation.

Pellegrini, C. N., Croci, C. A. and Orioli, G. A.

ISHS Acta Horticulturae 553: 565-566.

2001

บทคัดย่อ

Enhancement of quality criteria in garlic by gamma irradiation.

The effects of commercial rate of gamma rays (60 Gy) on the colour and weight of dormant garlic bulbs (cv. Colorado) were investigated. Bulbs were irradiated with gamma rays at 0.4 Gy/s 30 days postharvest (DPH; dormancy). At 25 DPH, the pigments from fresh samples of bulbs were localized in the outer mesophyllic layer and were beginning to migrate in the outer epidermis. After irradiation (40 DPH), The epidermal cells showed secondary walls strongly lignified with narrow lumens full of dense clots of pigments. In bulb samples taken at 120 DPH or later, a rapid fading of the reddish colour was observed. Samples of irradiated protective leaves taken 60, 90, 120 and 150 DPH showed no difference in the state and localization of pigments compared to those taken at 40 DPH. Changes in the state and localization of anthocyanins seem to be related with water content in the plant tissues, but not with chemical composition. Irradiation effects on water content and movement of solutes between organs during storage are factors that contribute strongly to the extended maintenance of quality properties in garlic bulbs.