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

Functional Plant Biology : FPB
Erica L WilliamsDugald C Close

Abstract

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 Lept...Continue Reading

Citations

Mar 8, 2011·The New Phytologist·Nicole M Hughes
May 25, 2010·Photochemistry and Photobiology·Sulayman A Oladepo, Glen R Loppnow
Aug 22, 2008·Physiologia Plantarum·Pengmin LiLailiang Cheng
Feb 6, 2020·Physiologia Plantarum·Águeda M González-RodríguezBeatriz Fernández-Marín

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