Cold hardening reduces photoinhibition of Eucalypts nitens and E. pauciflora at frost temperatures |
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Authors: | Charles R Warren Mark J Hovenden Neil J Davidson Chris L Beadle |
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Institution: | (1) Department of Plant Science, University of Tasmania, GPO Box 252-55, Hobart TAS 7001, Australia e-mail: Mark.Hovenden@utas.edu.au; Fax: 61 3 6226 2698, AU;(2) Cooperative Research Centre for Temperate Hardwood Forestry, GPO Box 252-12, Hobart TAS 7001, Australia, AU;(3) CSIRO Forestry and Forest Products, GPO Box 252-12, Hobart, TAS 7001, Australia, AU |
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Abstract: | Photoinhibition of photosynthesis at low temperatures was investigated in two species of subalpine eucalypt, Eucalypts nitens (Deane and Maiden) Maiden and E. pauciflora Sieb. ex Spreng. Imposition of an artificial cold-hardening treatment increased the frost tolerance of leaf tissue and increased
tolerance to excess light. Cold-hardened seedlings of both species had a higher photosynthetic capacity than non-hardened
seedlings at 6 and 16°C and lower levels of non-photochemical quenching (NPQ) at 20 and 5°C. Furthermore, hardened seedlings
had faster rates of NPQ development at 5 and −3.5°C. An increase in minimal fluorescence, which indicates slowly reversible
photoinhibition, was evident in all seedlings at −1.5 and −3.5°C but was less pronounced in hardened seedlings, with a threefold
faster rate of development of NPQ, at −3.5°C than non-hardened seedlings. Hardened seedlings also recovered faster from photoinhibition
at −3.5°C. Thus cold hardening increased tolerance to high light in these species. Differences between E. nitens and E. pauciflora in their response to excess light were small and significant only at −3.5°C. Faster recovery from photoinhibition of E. pauciflora was consistent with its occurrence in colder habitats than E. nitens.
Received: 27 April 1997 / Accepted: 9 September 1997 |
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Keywords: | Photoinhibition Photosynthesis Eucalypts Cold hardening Low temperature |
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