The effects of low-dose ultraviolet light-C treatment on polygalacturonase activity, delay ripening and Rhizopus soft rot development of tomatoes
C. Stevens, J. Liu , V. A. Khan, J. Y. Lu, M. K. Kabwe, C. L. Wilson, E. C. K. Igwegbe, E. Chalutz and S. Droby
Crop Protection Volume 23, Issue 6 , June 2004, Pages 551-554
2004
บทคัดย่อ
The effects of low-dose ultraviolet light-C treatment on polygalacturonase activity, delay ripening and Rhizopus soft rot development of tomatoes
Low-dose application of hormetic (adj. of hormetin, the agent of hormesis e.g. UV -C) ultraviolet light-C ( UV -C) to ‘Better Boy’ and ‘Floradade’ tomatoes at maturity resulted infruitsthat were significantly, firmer than non-irradiated controlfruitsat the same stage of maturity. As, firmness increased followingUV -C treatment, polygalacturonase (PG) activity decreased. The enzyme activity was lower forUV -C treatedfruitsthan the control. The PG activity in crude extract from decayed tomato tissue infected with
Rhizopons stolonifer was lower than non-decayedfruits. UV -C treated tomatoes showed a 40% reduction in PG activity in decayed tissue compared to the control at 72 h after treatment. The lesion diameter, and percent infection of non-treated andUV -C treated tomatoes at 72 h after treatment, was 13.4 mm (100% infection), and 5.3 mm (47% infection), respectively.