Title Photosynthetic response and recovery of Antarctic marine benthic microalgae exposed to elevated irradiances and temperatures
Author Salleh, S.; McMinn, A.
Author Affil Salleh, S., University of Tasmania, Institute for Marine and Antarctic Studies, Hobart, Tasmania, Australia. Other: Universiti Sains Malaysia, Malaysia
Source Polar Biology, 34(6), p.855-869, . Publisher: Springer-Verlag, Berlin, Germany. ISSN: 0722-4060
Publication Date Jun. 2011
Notes In English. 59 refs. Ant. Acc. No: 91625. GeoRef Acc. No: 310301
Index Terms algae; ecology; ocean environments; photosynthesis; plant ecology; salinity; temperature; Antarctica--Casey Station; Antarctica; benthic taxa; biochemistry; Casey Station; marine environment; microorganisms; photochemistry; Plantae; Wilkes Land
Abstract Exposure to high temperatures affects the photosynthetic processes in marine benthic microalgae by limiting the transport of electrons, thus reducing the ability of the cell to use light. This causes damage to the Photosystem II (PSII) and may lead to photoinhibition. However, the PSII of benthic microalgal communities from Brown Bay, eastern Antarctica, were relatively unaffected by significant changes in temperature. Benthic microalgae exposed to temperatures up to 8C and an irradiance of 450 lmol photons m-2s-1 did not experience any photosynthetic damage or irreversible photoinhibition. The effective quantum yield at 8C (0.433 0.042) was higher by comparison to cell incubated at -0.1C (0.373 0.015) with similar irradiances. Temperatures down to -5C at a similar irradiance showed a decrease in photosynthesis with decreasing temperature, but no severe photoinhibition as the cells were able to dissipate excess energy via non- photochemical quenching and recover from damage. These responses are consistent with those recorded in past studies on Antarctic benthic microalgae and suggest that short- term temperature change (from -5 to 8C) will not do irreversible damage to the PSII and will not affect the photosynthesis of the benthic microalgae.
URL http://hdl.handle.net/10.1007/s00300-010-0943-4
Publication Type journal article
Record ID 65007261