期刊
CROP PROTECTION
卷 23, 期 6, 页码 551-554出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cropro.2003.10.007
关键词
tomato; hormesis; induced resistance; Rhizopus soft rot
类别
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 in fruits that were significantly, firmer than non-irradiated control fruits at the same stage of maturity. As, firmness increased following UV-C treatment, polygalacturonase (PG) activity decreased. The enzyme activity was lower for UV-C treated fruits than the control. The PG activity in crude extract from decayed tomato tissue infected with Rhizopons stolonifer was lower than non-decayed fruits. 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 and UV-C treated tomatoes at 72 h after treatment, was 13.4 mm (100% infection), and 5.3 mm (47% infection), respectively. (C) 2003 Elsevier Ltd. All rights reserved.
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