Seasonal acclimation of photosystem II in Pinus sylvestris. II. Using the rate constants of sustained thermal energy dissipation and photochemistry to study the effect of the light environment

Tree Physiology
Albert Porcar-CastellEero Nikinmaa

Abstract

Photosynthesis in evergreen conifers is characterized by down-regulation in autumn and rapid up-regulation in spring. This seasonal pattern is largely driven by temperature, but the light environment also plays a role. In overwintering Scots pine (Pinus sylvestris L.) trees, PSII is less down-regulated and recovers faster from winter stress in shaded needles than in needles exposed to full sunlight. Because the effect of light on the seasonal acclimation of PSII has not been quantitatively studied under field conditions, we used the rate constants for sustained thermal energy dissipation and photochemistry to investigate the dynamics and kinetics of the seasonal acclimation of PSII in needles exposed to different light environments. We monitored chlorophyll fluorescence and needle pigment concentration during the winter and spring in Scots pine seedlings growing in the field in different shading treatments, and within the crowns of mature trees. The results indicated that differences in acclimation of PSII in overwintering Scots pine among needles exposed to different light environments can be chiefly attributed to sustained thermal dissipation. We also present field evidence that zeaxanthin-facilitated thermal dissipation and ...Continue Reading

Citations

Jul 10, 2012·Photosynthesis Research·José Ignacio García-PlazaolaAlbert Porcar-Castell
May 29, 2014·Journal of Experimental Botany·Albert Porcar-CastellJoseph A Berry
Mar 29, 2011·Journal of Photochemistry and Photobiology. B, Biology·Girish Kumar RasineniAttipalli Ramachandra Reddy
Jul 14, 2010·The New Phytologist·Guillermo Gea-IzquierdoFrank Berninger

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