Zeaxanthin and non‐photochemical quenching in sun and shade leaves of C3 and C4 plants

• DOI: 10.1034/j.1399-3054.1998.1040430.x
• Publication Date: 2003-03-12T18:23:19Z
• Authors: Enrico Brugnoli; Andrea Scartazza; Mario Carmelo De ...; Maria Cristina Mo...; Marco Lauteri; Angela Augusti
• Keywords: Violaxanthin; Antheraxanthin; Photoprotection; Photosynthetic pigment

The relationships between non‐radiative energy dissipation and the carotenoid content, especially xanthophyll cycle components, were studied in sun shade leaves of several plants possessing C 3 ( Hedera helix Laurus nobilis ) or 4 Zea mays Sorghum bicolor photosynthetic pathways. Sun‐shade acclimation caused marked changes organisation function apparatus, including significant variation content composition. contents zanthophyll pigments higher than all species, but this difference was considerably greater plants. proportion photoconvertible violaxanthin, that is amount violaxanthin (V) which can actually be de‐epoxidised to zeaxanthin, much leaves. V always linearly dependent on chlorophyll a/b ratio, although slope relationship varied species. leaf zeaxanthin antheraxanthin correlated with species under different light environments. These curvilinear variable Hence, excess does not appear univocally other photoprotective mechanisms may involved high irradiance stress. Such largely according their characteristics.