ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Tolerance of selected orange and mandarin hybrid fruit to low-dose irradiation for quarantine purposes.

Miller, W. R.; McDonald, R. E.; Chaparro, J.;

HortScience Year: 2000 Vol: 35 Issue: 7 Pages: 1288-1291 Ref: 18 ref.

2000

บทคัดย่อ

Tolerance of many citrus cultivars to low-dose irradiation treatment is not known. Ten citrus cultivars grown in Florida, USA, including five orange (Citrus sinensis) cultivars Ambersweet, Hamlin, Navel, Pineapple and Valencia and five mandarin (Citrus reticulata) hybrid cultivars Fallglo, Minneola, Murcott, Sunburst and Temple, were exposed to irradiation at 0, 0.15, 0.3, and 0.45 kGy, and stored for 14 days at 1 deg C or 5 deg C plus 3 days at 20 deg C, to determine dose tolerance based on fruit injury. Softening of Valencia, Minneola, Murcott and Temple was dose-dependent, but that of other cultivars was unaffected. Only Ambersweet, Valencia, Minneola and Murcott did not develop peel pitting at 0.15 kGy or higher. Total soluble solids of Ambersweet and Sunburst declined slightly with increasing dose. Titratable acidity (TA) of oranges was not affected, but TA of Sunburst and Temple juice was slightly reduced by irradiation at 0.45 kGy. Juice flavour of Hamlin, Navel, Valencia and Minneola, an

d pulp flavour of Hamlin, Valencia, Fallglo, Minneola and Murcott was less acceptable after irradiation at 0.3 or 0.45 kGy. The appearance of all cultivars was negatively affected by the loss of glossiness with the 0.45 kGy dose. Less than 1.0% of fruit decayed and irradiation treatment had no effect on decay. Our study indicates that growers and shippers need to be aware that the effects of irradiation on citrus fruits are highly variable and both cultivar-dependent and dose-dependent.