Effects of sudden exposure to high light levels on two tree fern species Dicksonia antarctica (Dicksoniaceae) and Cyathea australis (Cyatheaceae) acclimated to different light intensities
Author
Volkova, L; Bennett, LT; Tausz, MDate
2009-01-01Source Title
Australian Journal of BotanyPublisher
CSIRO PUBLISHINGAffiliation
School of Ecosystem and Forest SciencesUniversity General
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Volkova, L., Bennett, L. T. & Tausz, M. (2009). Effects of sudden exposure to high light levels on two tree fern species Dicksonia antarctica (Dicksoniaceae) and Cyathea australis (Cyatheaceae) acclimated to different light intensities. AUSTRALIAN JOURNAL OF BOTANY, 57 (7), pp.562-571. https://doi.org/10.1071/BT09153.Access Status
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10.1071/BT09153Abstract
We examined the responses of two tree fern species (Dicksonia antarctica and Cyathea australis) growing under shade or variable light (intermittent shade) to sudden exposure to high light levels. Steady-state gas exchange as well as dynamic responses of plants to artificial sunflecks indicated that difference in growth light environment had very little effect on the tree ferns' capacities to utilise and acclimate to prevailing light conditions. Two weeks of exposure to high light levels (short-term acclimation) led to decreases in all photosynthetic parameters and more negative predawn frond water potentials, mostly irrespective of previous growth light environments. After 3months in high light levels (long-term acclimation), D. antarctica fully recovered, while C. australis previously grown under variable light, recovered only partially, suggesting high light level stress effects under the variable light environments for this species.
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