Articles
UV-C IRRADIATION AFFECTS ACCUMULATION OF SCOPARONE IN CITRUS
Article number
907_7
Pages
81 – 85
Language
English
Abstract
Ultraviolet (UV) irradiation induces the accumulation of a phytoalexin, which has strong anti-fungal properties, scoparone (6, 7-dimethoxycoumarin), in the leaves and flavedo of Citrus. We examined the effects of UV-C (250 nm, 0.29 W cm-2) irradiation on the scoparone accumulation in leaves and flavedo of Hyuga-natsu and Calamondin harvested in August by high-performance liquid chromatography (HPLC). The duration of irradiation was 10, 20, 30, 40, 50, and 60 minutes.
In leaves, the amount of scoparone increased in Hyuga-natsu but not in Calamondin with increasing the duration of irradiation.
In flavedo, the amount of scoparone increased with increasing the periods of irradiation.
In Hyuga-natsu, leaves produced markedly more scoparone than the flavedo did (0-200 and 2-35 μg g FW-1, respectively). In contrast, Calamondin produced almost the same amount of scoparone in leaves (1-4 μg g FW-1) and flavedo (2-10 μg g FW-1). Thus, the effects of UV-C irradiation differed among Citrus species and organs.
In leaves, the amount of scoparone increased in Hyuga-natsu but not in Calamondin with increasing the duration of irradiation.
In flavedo, the amount of scoparone increased with increasing the periods of irradiation.
In Hyuga-natsu, leaves produced markedly more scoparone than the flavedo did (0-200 and 2-35 μg g FW-1, respectively). In contrast, Calamondin produced almost the same amount of scoparone in leaves (1-4 μg g FW-1) and flavedo (2-10 μg g FW-1). Thus, the effects of UV-C irradiation differed among Citrus species and organs.
Authors
T. Kuniga, H. Nesumi
Keywords
Botrytis cinerea, ‘Calamondin’, Colletotrichum gloeosporioides, ‘Hyuga-natsu’, phytoalexin
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