Wax as a Mechanism for Protection against Photoinhibition — A Study of Cotyledon orbiculata

Wiley - Tập 106 Số 4 - Trang 307-312 - 1993
Sharon A. Robinson1, Catherine E. Lovelock1, C. B. Osmond1
1Research School of Biological Sciences, Institute of Advanced Studies, The Australian National University, Canberra ACT, Australia

Tóm tắt

AbstractThe leaves of the Crassulacean acid metabolism plant Cotyledon orbiculata have a waxy coating which is highly reflective but can be easily removed by brushing. This provided an ideal system in which to investigate the role of epidermal wax as a possible photoprotectant. Removal of the wax, prior to exposure to natural sunlight, resulted in substantial decreases in Fv/Fm and in severe cases evidence of photoinhibitory damage, as indicated by a rise in Fo. Leaves from which wax had been removed also showed higher conversion of violaxanthin to zeaxanthin than waxed leaves. Recovery of brushed leaves over a 12 day period was correlated with an increase in the total pool of xanthophyll cycle components. This study suggests that the presence of highly reflective wax on the epidermis may confer significant photoprotection to plants exposed to high solar radiation environments.

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Wiley

Tập 106 Số 4

307-312

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