The dynamics of photosynthetic acclimation to changes in light quanlity and quality in three Australian rainforest tree species

Turnbull M.H., Doley D. and Yates D.J. (1993) The dynamics of photosynthetic acclimation to changes in light quanlity and quality in three Australian rainforest tree species. Oecologia, 94 2: 218-228. doi:10.1007/BF00341320


Author Turnbull M.H.
Doley D.
Yates D.J.
Title The dynamics of photosynthetic acclimation to changes in light quanlity and quality in three Australian rainforest tree species
Journal name Oecologia   Check publisher's open access policy
ISSN 0029-8549
Publication date 1993-01-01
Sub-type Article (original research)
DOI 10.1007/BF00341320
Open Access Status Not yet assessed
Volume 94
Issue 2
Start page 218
End page 228
Total pages 11
Publisher Springer-Verlag
Subject 2303 Ecology
Abstract Photosynthetic acclimation was studied in seedlings of three subtropical rainforest species representing early (Omalanthus populifolius), middle (Duboisia myoporoides) and late (Acmena ingens) successional stages in forest development. Changes in the photosynthetic characteristics of pre-existing leaves were observed following the transfer of plants between deep shade (1-5% of photosynthetically active radiation (PAR), selectively filtered to produce a red/far-red (R/FR) ratio of 0.1) and open glasshouse (60% PAR and a R/FR ratio of 1.1-1.2), and vice versa. The extent and rate of response of the photosynthetic characteristics of each species to changes in light environment were recorded in this simulation of gap formation and canopy closure/overtopping. The light regimes to which plants were exposed produced significant levels of acclimation in all the photosynthetic parameters examined. Following transfer from high to low light, the light-saturated rate of photosynthesis was maintained near pre-transfer levels for 7 days, after which it decreased to levels which closely approximated those in leaves which had developed in low light. The decrease in photosynthetic capacity was associated with lower apparent quantum yields and stomatal conductances. Dark respiration was the parameter most sensitive to changes in light environment, and responded significantly during the first 4-7 days after transfer. Acclimation of photosynthetic capacity to increases in irradiance was significant in two of the three species studied, but was clearly limited in comparison with that of new leaves produced in the high light conditions. This limitation was most pronounced in the early-successional-stage species, O. populifolius. It is likely that structural characteristics of the leaves, imposed at the time of leaf expansion, are largely responsible for the limitations in photosynthetic acclimation to increases in irradiance.
Keyword Assimilation rate
Dark respiration
Photosynthetic acclimation
Rainforest
Stomatal conductance
Q-Index Code C1
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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