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

Functional Plant Biology : FPB
Zhiguang Xu, Kunshan Gao

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.

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Citations

Mar 6, 2010·Photochemistry and Photobiology·Juntian Xu, Kunshan Gao
Feb 18, 2011·Photosynthesis Research·John A RavenStephen C Maberly
Jul 31, 2012·Photosynthesis Research·John A Raven, Catriona L Hurd
Nov 13, 2014·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Donat-P HäderRobert Worrest
Oct 15, 2013·Journal of Experimental Botany·John A Raven
May 16, 2017·Journal of Experimental Botany·John A RavenPatricia Sánchez-Baracaldo
Mar 24, 2021·Marine Pollution Bulletin·Alice C A BlanckaertChristine Ferrier-Pagès

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