Photoinhibition in the Antarctic moss Grimmia antarctici Card when exposed to cycles of freezing and thawing

Lovelock, CE, Osmond, CB and Seppelt, RD (1995) Photoinhibition in the Antarctic moss Grimmia antarctici Card when exposed to cycles of freezing and thawing. Plant Cell and Environment, 18 12: 1395-1402. doi:10.1111/j.1365-3040.1995.tb00200.x


Author Lovelock, CE
Osmond, CB
Seppelt, RD
Title Photoinhibition in the Antarctic moss Grimmia antarctici Card when exposed to cycles of freezing and thawing
Journal name Plant Cell and Environment   Check publisher's open access policy
ISSN 0140-7791
Publication date 1995-12-01
Year available 1995
Sub-type Article (original research)
DOI 10.1111/j.1365-3040.1995.tb00200.x
Open Access Status Not yet assessed
Volume 18
Issue 12
Start page 1395
End page 1402
Total pages 8
Place of publication OXFORD
Publisher BLACKWELL SCIENCE LTD
Language eng
Abstract Freezing and thawing of the endemic moss species Grimmia antarctici Card, caused photoinhibition. When snow cover was removed from moss in the field, resulting in exposure to fluctuating temperatures and light conditions, photoinhibition, measured as a reduction in the ratio of variable to maximum chlorophyll a fluorescence (F-v/F-m), was observed. The extent of photoinhibition was highly variable and appeared to be reversible during periods of warmer temperatures, A series of controlled laboratory studies found that the light conditions that prevail between freezing and thawing events influenced the recovery from photoinhibition observed during freezing and thawing, with low light conditions facilitating the greatest rates of recovery, After four cycles of freezing and thawing, recovery from photoinhibition in hydrated moss was achieved within 12 h of transfer to 5 degrees C and 15 mu mol quanta m(-2) s(-1). These results favour the hypothesis that photoinhibition observed during freezing represents a protective process involving the down-regulation of photosystem II when photosynthetic carbon assimilation is limited by low temperatures.
Keyword Antarctic moss
Grimmia antarctici Card
photoinhibition
freezing and thawing
Isolated Mesophyll Protoplasts
Chlorophyll Fluorescence
Photosynthetic Apparatus
Thylakoid Membranes
Scots Pine
Desiccation
Plants
Stress
Winter
Light
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: WoS Import - Archived
 
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Created: Fri, 16 May 2014, 04:32:23 EST by Professor Catherine Lovelock