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THE INTERACTION BETWEEN INORGANIC CARBON ACQUISITION AND LIGHT SUPPLY IN PALMARIA PALMATA (RHODOPHYTA) 1
Author(s) -
Kübler Janet E.,
Raven John A.
Publication year - 1995
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.0022-3646.1995.00369.x
Subject(s) - total inorganic carbon , biology , photosynthesis , botany , acclimatization , chlorophyll fluorescence , carbon fibers , photon flux , ocean acidification , dissolved organic carbon , chlorophyll a , bicarbonate , photosystem ii , fluorescence , flux (metallurgy) , chlorophyll , photon , carbon dioxide , seawater , ecology , physics , optics , chemistry , materials science , composite number , composite material , endocrinology , organic chemistry
The dependence of the carbon concentrating mechanism of Palmaria palmata ( L.) Kuntze on the growth light level was examined 1) to determine whether or not there is a threshold photon flux density (PFD) at which the inorganic carbon uptake mechanism can operate and 2) to attempt to quantify the relative energetic costs of acclimation to the two different limiting factors, PFD and dissolved inorganic carbon (DIC) concentration. Plants were grown at six PFDs: 5, 25, 50, 75, 95, and 125 μmol photons. m −2 .s −1 . Growth rates increased with increasing PFD from 5 to 50 μmol photons. m −2 . s −1 and were light‐saturated at 75, 95, and 125 μmol photons. m −2. s −1 Values of δ 13 C increased continuously with increasing growth PFD and did not saturate over the range of light levels tested. Time‐resolved fluorescence characteristics indicated a progressive photoacclimation below 50 μmol photons. m −2 . s −1 . Analysis of chlorophyll fluorescence induction showed three levels of light use efficirncy associated with growth at 5 or 25, 50, and >75 μmol photons. m −2. s −1 . The light‐haruesting efficiency was inversely proportional to the effectiveness of DIC acquisition in plants grown at the six PFDs. These data were interpreted to indicate that there is a physiological tradeoff between photosynthetic efficiency and bicarbonate use in this species .