Metabolic recovery of the Antarctic liverwort Cephaloziella varians during spring snowmelt
Snell, K.R.S.; Convey, P.; Newsham, K.K.. 2007 Metabolic recovery of the Antarctic liverwort Cephaloziella varians during spring snowmelt. Polar Biology, 30 (9). 1115-1122. 10.1007/s00300-007-0269-zBefore downloading, please read NORA policies.
We measured the responses of pigments and chlorophyll a fluorescence parameters of the Antarctic leafy liverwort Cephaloziella varians to snowmelt during austral spring 2005 at Rothera Point on the western Antarctic Peninsula. Although no changes to the concentrations of UV-B photoprotective pigments were detected during snowmelt, chlorophyll and carotenoid concentrations and maximum photosystem (PS)II yield (F v /F m) were respectively 88, 60 and 144% higher in the tissues of the liverwort that had recently emerged from snow than in those under a 10 cm depth of snow. A laboratory experiment similarly showed that effective PSII yield increased rapidly within the first 45 min after plants sampled from under snow were removed to an illuminated growth cabinet. The pigmentation and PSII yields of plants during snowmelt were also compared with those of plants in January, during the middle of the growing season at Rothera Point. During snowmelt, plants had lower F v /F m values, chlorophyll a/b ratios and concentrations of UV-B photoprotective pigments and carotenoids than during mid-season, suggesting that although there is some recovery of PSII activity and increases in concentrations of photosynthetic pigments during snowmelt, the metabolism of C. varians is restricted during this period.
|Programmes:||BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Long-Term Monitoring and Survey – Biological Sciences Division|
|Additional Keywords:||Anthocyanin-like pigment, Carotenoids, Chlorophyll a and b, Chlorophyll fluorescence, Photosystem II, UV-B screening pigments|
|NORA Subject Terms:||Botany
Ecology and Environment
|Date made live:||02 Mar 2009 14:03|
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