Application of Ultraviolet-C Light on Storage Rots and Ripening of Tomatoes.

The application of ultraviolet light (UV-C, 254 nm) hormesis on fruits and vegetables to stimulate beneficial responses is a new method for controlling storage rots and extending the shelf-life of fruits and vegetables. The present study was aimed at treating tomatoes ( Lycopersicon esculentum ) with different UV-C dosages (1.3 to 40 KJ/m2) to induce resistance to black mold ( Alternaria alternata ), gray mold ( Botrytis cinerea ), and Rhizopus soft rot ( Rhizopus stolonifer ). These diseases were effectively reduced when tomatoes were inoculated following UV-C irradiation. UV-C treated tomatoes were firmer in texture and less red in color than the control tomatoes, indicating a delay in ripening. Slower ripening and resistance to storage rots of tomatoes are probably related. The positive effect of UV-C on tomatoes decreased as treatments were performed at stages of increased ripeness.

[1]  R. Buchanan,et al.  Starch-Ampicillin Agar for the Quantitative Detection of Aeromonas hydrophila , 1985, Applied and environmental microbiology.

[2]  C. Wilson,et al.  Potential for biological control of postharvest plant diseases , 1985 .

[3]  K. Verhoeff,et al.  Toxicity of tomatine to Botrytis cinerea, in relation to latency , 1975 .

[4]  A. Lehmann,et al.  Biological effects of ultraviolet radiation , 1979, Nature.

[5]  V. Khan,et al.  THE EFFECT OF ULTRAVIOLET IRRADIATION ON SHELF‐LIFE AND RIPENING OF PEACHES AND APPLES , 1991 .

[6]  J. G. Roddick.  The steroidal glycoalkaloid α-tomatine , 1974 .

[7]  S. Palumbo.  The growth of Aeromonas hydrophila K144 in ground pork at 5°C , 1988 .

[8]  G. Wauters,et al.  New enrichment method for isolation of pathogenic Yersinia enterocolitica serogroup O:3 from pork , 1988, Applied and environmental microbiology.

[9]  M. Skurnik,et al.  Comparative study of a DNA hybridization method and two isolation procedures for detection of Yersinia enterocolitica O:3 in naturally contaminated pork products , 1991, Applied and environmental microbiology.

[10]  C. Frenkél.  Involvement of Peroxidase and Indole-3-acetic Acid Oxidase Isozymes from Pear, Tomato, and Blueberry Fruit in Ripening. , 1972, Plant physiology.

[11]  W. J. Langford.  Statistical Methods , 1959, Nature.

[12]  V. Khan,et al.  The Effect of Ultraviolet Radiation on Mold Rots and Nutrients of Stored Sweet Potatoes. , 1990, Journal of food protection.

[13]  E. de Boer,et al.  Survival of Campylobacter jejuni during Poultry Processing and Pig Slaughtering. , 1983, Journal of food protection.