Lutein epoxide cycle, light harvesting and photoprotection in species of the tropical tree genus Inga

Plant, Cell & Environment
Shizue MatsubaraKlaus Winter

Abstract

Dynamics and possible function of the lutein epoxide (Lx) cycle, that is, the reversible conversion of Lx to lutein (L) in the light-harvesting antennae, were investigated in leaves of tropical tree species. Photosynthetic pigments were quantified in nine Inga species and species from three other genera. In Inga, Lx levels were high in shade leaves (mostly above 20 mmol mol(-1) chlorophyll) and low in sun leaves. In Virola surinamensis, both sun and shade leaves exhibited very high Lx contents (about 60 mmol mol(-1) chlorophyll). In Inga marginata grown under high irradiance, Lx slowly accumulated within several days upon transfer to deep shade. When shade leaves of I. marginata were briefly exposed to the sunlight, both violaxanthin and Lx were quickly de-epoxidized. Subsequently, overnight recovery occurred only for violaxanthin, not for Lx. In such leaves, containing reduced levels of Lx and increased levels of L, chlorophyll fluorescence induction showed significantly slower reduction of the photosystem II electron acceptor, Q(A), and faster formation as well as a higher level of non-photochemical quenching. The results indicate that slow Lx accumulation in Inga leaves may improve light harvesting under limiting light, whil...Continue Reading

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Citations

Jul 10, 2012·Photosynthesis Research·José Ignacio García-PlazaolaAlbert Porcar-Castell
Nov 14, 2012·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Shizue MatsubaraBarry Osmond
Mar 20, 2013·Biological Reviews of the Cambridge Philosophical Society·Peter J GrubbAlfredo Valido
Jan 1, 2009·Functional Plant Biology : FPB·Shizue MatsubaraKlaus Winter
Aug 2, 2017·Proceedings of the National Academy of Sciences of the United States of America·Lauriebeth LeonelliKrishna K Niyogi

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