Photosynthetica 2000, 38(2):205-210 | DOI: 10.1023/A:1007209613291

Responses of the Antioxidant Systems and Xanthophyll Cycle in Phaseolus vulgaris to the Combined Stress of High Irradiance and High Temperature

Liang Ye1, Hui-yuan Gao2, Qi Zou1
1 Department of Plant Science, Shandong Agricultural University, Tai'an, Shandong, P.R. China
2 Department of Plant Science, Shandong Agricultural University, Tai'an, Shandong, P.R. China

Changes in the activities of enzymes involved in scavenging active oxygen species were followed after exposing bean seedling leaves (Phaseolus vulgaris L.) to various cross stresses of irradiance and temperature. The activities of superoxide dismutase (SOD, EC 1.15.1.1) and ascorbate peroxidase (AsAPOD, EC 1.11.1.11) increased to different extent with prolonged irradiation of the leaves, and were stimulated by high temperature (HT). The activity of catalase (CAT, 1.11.1.6) decreased when exposed to strong irradiance (HI), and the decrease was further exacerbated when HI was combined with HT. CAT activity was more sensitive to HT than to HI. Ascorbate (AsA) content slightly decreased and then increased during the treatment of HI, but decreased under the cross stress of HI and HT. On the contrary, glutathione (GSH) content increased all the time during various treatments of irradiance and temperature. The increase in the combined stress was even more pronounced. Irradiance is the major reason in triggering the operation of xanthophyll cycle, which was difficult to be started by HT. The antioxidant systems tended to be inactivated with prolonged exposure to the cross stress of HI and HT. The de-expoxidated state of xanthophyll cycle, however, was increasing all the time, which indicated that the zeaxanthin-dependent thermal dissipation was one major energy dissipation pathway during the cross stress of HI and HT.

Additional key words: antheraxanthin; ascorbate peroxidase; catalase; dithiothreitol; glutathione; superoxide dismutase; violaxanthin; zeaxanthin

Prepublished online: November 1, 2000; Published: August 1, 2000  Show citation

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Ye, L., Gao, H., & Zou, Q. (2000). Responses of the Antioxidant Systems and Xanthophyll Cycle in Phaseolus vulgaris to the Combined Stress of High Irradiance and High Temperature. Photosynthetica38(2), 205-210. doi: 10.1023/A:1007209613291
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