Photosynthetic capacity and light harvesting efficiency during the winter-to-spring transition in subalpine conifers
Article first published online: 5 JUL 2006
Volume 172, Issue 2, pages 283–292, October 2006
How to Cite
Zarter, C. R., Demmig-Adams, B., Ebbert, V., Adamska, I. and Adams, W. W. (2006), Photosynthetic capacity and light harvesting efficiency during the winter-to-spring transition in subalpine conifers. New Phytologist, 172: 283–292. doi: 10.1111/j.1469-8137.2006.01816.x
- Issue published online: 19 JUL 2006
- Article first published online: 5 JUL 2006
- Received: 23 February 2006 Accepted: 15 May 2006
- energy dissipation;
- photosynthetic down-regulation;
- spring reactivation;
- subalpine forest;
- • Some coniferous forest ecosystems undergo complete photosynthetic down-regulation in winter. The present study examined the influence of several environmental parameters on intrinsic, needle-level photosynthesis and photoprotection during the spring reactivation of photosynthesis in subalpine conifers.
- • Maximal photosystem II (PSII) efficiency, photosynthetic capacity, and amounts of zeaxanthin and early light-inducible protein (Elip) family members were assessed in three subalpine conifer species over 3 years, and intensively during the 2003 winter-to-spring transition.
- • During summers, maximal PSII efficiency remained high while intrinsic photosynthetic capacity varied depending on precipitation. During winters and the winter-to-spring transition, photosynthetic capacity and PSII efficiency were highly correlated and (during the spring transition) strongly influenced by air and soil temperature and liquid water availability. Decreases in the amount of Elip family members from winter through spring paralleled disengagement of sustained zeaxanthin-dependent photoprotection, although one of four anti-Elip antibody-reactive bands increased during spring.
- • Intrinsic photosynthetic capacity and maximal PSII efficiency were highly responsive to day-to-day environmental changes during spring, indicating that multiple environmental signals are integrated to orchestrate the reactivation of photosynthesis from the inactive winter state to the active summer state.