Photosynthetic Attributes of Antarctic PlantsEntry ID: ASAC_244
Abstract: Metadata record for data from ASAC Project 244 See the
link below for public details on this project.
From the abstracts of the referenced papers:
Photoinhibition of Grimmia antarctici (Grimmia is now known as Schistidium) during the summer at Casey, East Antarctica, was indicated by a reduction in photosynthetic capacity (light saturated photosynthetic rate), photosynthetic efficiency (photon ... yield of O2 evolution), photochemical quantum yield (ratio of variable to maximum fluorescence) and rate of fluorescence quenching when plants were exposed to moderate light at low temperature. We suggest that photoinhibition is a major factor limiting bryophyte productivity in Antarctic ecosystems.
Variation in leaf pigmentation from green to ginger is observed for Ceratodon purpureus (Hedw.) Brid. in Antarctica. Electron microscopy of ginger and green leaves reveals less thylakoid stacking, a response to greater light exposure, in the ginger leaves. In extremely exposed sites C. purpureus has low chlorophyll a/b ratios which correlate with decreased 77K chlorophyll fluorescence, indicating damage to chlorophyll a. Pigment analysis of ginger moss shows that even when the chlorophyl a/b ratio has not decreased the pigment composition differs from green moss. The increase in anthocyanin and decrease in chlorophyll concentrations largely account for the visual change from green to ginger. The ratio of total carotenoid to chlorophyll varies from 0.35 in green moss to 0.55 in the ginger moss, with violaxanthin increased preferentially. Since these changes in pigmentation are consistent with photoprotection and they are linked to light depended variations in chloroplast structure, it appears that photoprotective pigments are a useful adaptation for the bright Antarctic environment.
Start Date: 1986-09-30Stop Date: 1988-01-31
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Distribution Media: HTTP
Distribution Size: 2,510 kb
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Role: TECHNICAL CONTACT
Postal Code: 2109
Role: DIF AUTHOR
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: dave.connell at aad.gov.au
Australian Antarctic Division 203 Channel Highway
Province or State: Tasmania
Postal Code: 7050
Adamson H., Wilson M., Selkirk P., Seppelt R. (1988) Photoinhibition in Antarctic mosses. Polarforschung 58(2/3). 103-111
Post A. (1990) Photoprotective pigment as an adaptive strategy in the Antarctic moss Ceratodon purpureus . Polar Biology 10(4). 241-245
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Creation and Review Dates
DIF Creation Date: 2000-07-20
Last DIF Revision Date: 2014-01-10