Survey of Thermal Energy Dissipation and Pigment Composition in Sun and Shade Leaves

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概要

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• A survey was conducted of the magnitude of energy dissipation in photosystem II (ecpressed as nonphotochemical quenching of chlorophyll fluorescence, NPQ) as well as leaf carotenoid composition of a wide range of different plant species growing in deep shade and/or full sun. Consistently higher levels of the reversible component of NPQ as well as higher degrees of rapidly attainable de-epoxidation of the xanthophyll cycle (VAZ) pool were observed in sun leaves to compared to deep shade leaves. It is concluded that these altered features of the xanthophyll cycle allowed sun leaves to dissipate excess energy more effectively over the short term. In addition to the rapid increase in reversible NPQ, shade leaves exhibited a slow further, and sustained, increase in NPQ. In contrast to these deep shade leaves experimentally exposed to high PFDs, understory leaves experiencing highly variable PFD in their natural environment appeared to be able to dissipate excess excitation energy adequately via xanthophyll cycle-dependent thermal dissipation. Furthermore, very consistent trends across plant species were observed for changes in carotenoid composition (pools of carotenes, VAZ, and other xanthophylls)in response to light environment, as long as it is assumed that in some species β-carotene can be replaced by α-carotene and in a few plant species lutein can be replaced by lactucaxanthin. Sun leaves consistently exhibited much greater levels of VAZ than shade leaves but very similar levels of lutein and neoxanthin(all on a Chl basis)as well as an only slightly higher ratio of total carotenes to the pool of all xanthophylls.

• 日本植物生理学会の論文

著者

• Demmig-adams Barbara

  Department Of Ecology And Evolutionary Biology University Of Colorado

• Demmig-adams Barbara

  Department Of Environmental Population And Organismic Biology University Of Colorado

関連論文

• Activation of Sucrose Transport in Defoliated Lolium perenne L. : An Example of Apoplastic Phloem Loading Plasticity
• Survey of Thermal Energy Dissipation and Pigment Composition in Sun and Shade Leaves

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