期刊
PLANT BIOLOGY
卷 15, 期 6, 页码 1033-1039出版社
WILEY
DOI: 10.1111/j.1438-8677.2012.00712.x
关键词
High light; LHCSR and PsbS proteins; photoprotection; Ulva prolifera
资金
- National Natural Science Foundation of China [31200187, 41176153]
- Hi-Tech Research and Development Program (863) of China [2012AA052103]
- Shandong Science and Technology project [2011GHY11528]
- Specialized Fund for Basic Research Operating Expenses Program [20603022012004]
- Natural Science Foundation of Shandong Province [2009ZRA02075]
- Qingdao Municipal Science and Technology project [11-3-1-5-hy]
- National Marine Public Welfare Research Project [200805069]
Ulva prolifera, an intertidal macroalga, has to adapt to wide variations in light intensity, making this species particularly rewarding for studying the evolution of photoprotective mechanisms. Intense light induced increased non-photochemical quenching (NPQ) and stimulated de-epoxidation of xanthophyll cycle components, while DTT-treated samples had lower NPQ capacity, indicating that the xanthophyll cycle must participate in photoprotection. In this work, we found that the PsbS-related NPQ was maintained in U.prolifera. According to analysed gene expression, both LhcSR and psbS were up-regulated in high light, suggesting that these two genes are light-induced. LHCSR and PsbS proteins were present at different light intensities and accumulated under high light conditions, and PsbS concentrations were higher than LHCSR, showing that the NPQ mechanism of U.prolifera is more dependent on PsbS protein concentration. Moreover, the level of both LHCSR and PsbS proteins was high even in the darkness, and neither the transcript level nor protein content of LhcSR and psbS genes varied significantly following short-term exposure to intense light. These findings suggest that this alga can modulate NPQ levels through regulation of the xanthophyll cycle and concentrations of PsbS and/or LHCSR.
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