Journal
FUNCTIONAL PLANT BIOLOGY
Volume 36, Issue 12, Pages 1057-1064Publisher
CSIRO PUBLISHING
DOI: 10.1071/FP09092
Keywords
photosynthesis; pigment; the ratio of V-max to K-DIC; UV-absorbing compounds
Categories
Funding
- National Basic Research Program of China [2009CB421207]
- National Natural Science Foundation of China [90411018, 40876058]
- '863' project [2006AA10A413]
- Ministry of Education [308015]
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Solar ultraviolet radiation (UVR, 280-400 nm) is known to negatively affect macroalgal growth and photosynthesis, while phosphorus availability may affect their sensitivity to UVR. Here, we show that UV-A enhanced the growth rate of the red macroalga, Gracilaria lemaneiformis Bory de Saint-Vincent under inorganic phosphorus (Pi)-replete but reduced it under Pi-limited conditions. Maximal net photosynthetic rates were significantly reduced by both UV-A and UV-B, but the apparent photosynthetic efficiency was enhanced in the presence of UV-A. The UV-induced inhibition was exacerbated under Pi-limited conditions. The activity of total carbonic anhydrase was enhanced and the photosynthetic affinity for exogenous inorganic carbon (Ci) was raised for thalli grown in the presence of UVR under both Pi-replete and Pi-limited conditions. The relative growth rate was closely related to Ci acquisition capability (V-max/K-DIC), which was enhanced by UVR exposure under Pi-replete but not significantly affected under Pi-limited conditions.
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