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RESEARCH ARTICLE
Contents Vol 36(12)

Impacts of UV radiation on growth and photosynthetic carbon acquisition in Gracilaria lemaneiformis (Rhodophyta) under phosphorus-limited and replete conditions

Zhiguang Xu A and Kunshan Gao B C
+ Author Affiliations
- Author Affiliations

A Marine Biology Institute, Shantou University, Shantou, Guangdong 515063, China.

B State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujian 361005, China.

C Corresponding author. Email: ksgao@xmu.edu.cn

Functional Plant Biology 36(12) 1057-1064 https://doi.org/10.1071/FP09092
Submitted: 27 April 2009  Accepted: 24 July 2009   Published: 3 December 2009

Abstract

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 (Vmax/KDIC), which was enhanced by UVR exposure under Pi-replete but not significantly affected under Pi-limited conditions.

Additional keywords: photosynthesis, pigment, the ratio of Vmax to KDIC, UV-absorbing compounds.


Acknowledgements

This research was supported by National Basic Research Program of China (2009CB421207), National Natural Science Foundation of China (90411018, 40876058) and ‘863’ project (2006AA10A413) and Ministry of Education (308015). Professor John Hodgkiss is thanked for his assistance with the English in this paper.


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