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Tytuł pozycji:

Strategies of light energy utilisation, dissipation and attenuation in six co-occurring alpine heath species in Tasmania.

Tytuł :
Strategies of light energy utilisation, dissipation and attenuation in six co-occurring alpine heath species in Tasmania.
Autorzy :
Williams EL; School of Plant Science, University of Tasmania, Locked Bag 55, Hobart, Tas. 7001, Australia. Current address; Department of Biological Sciences, Macquarie University, NSW 2109, Australia.
Hovenden MJ; School of Plant Science, University of Tasmania, Locked Bag 55, Hobart, Tas. 7001, Australia. Corresponding author; email: .
Close DC; School of Plant Science, University of Tasmania, Locked Bag 55, Hobart, Tas. 7001, Australia. CRC Sustainable Production Forestry, Locked Bag 12, Hobart, Tas. 7001, Australia.
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Źródło :
Functional plant biology : FPB [Funct Plant Biol] 2003 Jan; Vol. 30 (12), pp. 1205-1218.
Typ publikacji :
Journal Article
Język :
English
Imprint Name(s) :
Original Publication: Collingwood, VIC, Australia : CSIRO Pub., c2002-
Entry Date(s) :
Date Created: 20200722 Latest Revision: 20200721
Update Code :
20210301
DOI :
10.1071/FP03145
PMID :
32689102
Czasopismo naukowe
Alpine environments are characterised by low temperatures and high light intensities. This combination leads to high light stress owing to the imbalance between light energy harvesting and its use in photochemistry. In extreme cases, high light stress can lead to the level of photo-oxidative damage exceeding the rate of repair to the photosynthetic apparatus. Plant species may vary in the mechanisms they use to prevent photodamage, but most comparisons are of geographically and ecologically distinct species. Differences in leaf colouration suggested that photoprotective strategies might differ among Tasmanian evergreen alpine shrub species. We compared chlorophyll fluorescence and leaf pigment composition in six co-occurring alpine shrub species on the summit of Mt Wellington, southern Tasmania, Australia, during spring and autumn. We found marked differences among species in light energy utilisation, attenuation and dissipation. Ozothamnus ledifolius maintained a large capacity for photosynthetic light utilisation and thus, had a low requirement for light dissipation. All five of the other species relied on xanthophyll-cycle-dependent thermal energy dissipation. In addition Epacris serpyllifolia, Richea sprengelioides and Leptospermum rupestre had foliar anthocyanins that would attenuate photosynthetically active light in the leaf. During spring, all species retained de-epoxidised xanthophylls through the night and the pre-dawn concentration of antheraxanthin and zeaxanthin was significantly correlated with reductions in pre-dawn F v / F m . We propose that these species use three photoprotective strategies to cope with the combination of high light and low temperature.

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