ISHS Acta Horticulturae 618: XXVI International Horticultural Congress: Environmental Stress and Horticulture Crops
CHANGES IN ANTHOXANTHIN CONCENTRATIONS AND ANTIOXIDATIVE ENZYMES IN A CATTLEYA (ORCHIDACEAE) HYBRID GROWN UNDER DIFFERENT UV CONDITIONS |
| Authors: | X. Zhao, S. Matsui, J. Li |
| Keywords: | anthoxanthin, antioxidative enzymes, cattleya, UV-A irradiation |
| Abstract:
Cattleya Slc. Estella Jewel ‘Kazumura’ plants were grown under different UV conditions beginning in June for five months. UV, especially UV-A370, was required for chlorophyll and carotenoid synthesis. Anthoxanthin was reduced by UV-A352 and UV-A370. SOD activity in leaves decreased by sudden UV-A352 exposure with a subsequent rapid increase. Different changes in APX under different UV conditions show a long duration of deteriorated effects of UV-A352 and –UV. CAT activities of every plot decreased in summer. UV-A352 affected more anthoxanthins and antioxidative enzyme activities than UV-A370. These findings indicate that Cattleya that tolerates UV by increased carotenoid synthesis and subsequent increases in SOD and APX activities after SOD inactivation during the early period of the irradiation. | |
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