By H. W. Woolhouse
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Additional resources for Advances in Botanical Research, Vol. 10
Lutein may be a light-harvesting pigment in Chlorophyta, cf. higher plants (Siefermann-Harms, 1980b). See text for further details. * Signifies present in trace amounts. P=Prokaryotic M = Mesokaryotic E = Eukaryotic (For further division of eukaryotic types, see Stewart and Mattox, 1975). 28 A. W. D. LARKUM AND JACK BARRETT proportional to the surface area to volume ratio. Further confirmation of this point has been provided (Littler and Murray, 1974; Ramus, 1978; Littler, 1980; Arnold and Murray, 1980; Littler and Littler, 1980).
Clearly, a disadvantage of canopy dominance or the presence of a tough, thick thallus is the increased respiratory activity incurred by cells which are non-photosynthetic or are highly shaded. Thus although light harvesting may be efficient, productivity (the net accumulation of organic carbon) may be less so. Nevertheless as discussed above such types of algae dominate in many littoral and sublittoral situations due to various ecological factors (cf. Littler and Littler, 1980). , 1975) and other communities take their place (Subsection B).
Under high light conditions the carboxylating machinery of the outermost layer of chloroplasts can effectivelyutilize all the carbon dioxide diffusing into a cell (Subsection F). Thus a second layer (or larger chloroplasts) would be of little use. Under low light conditions much more carbon dioxide is available inside the first layer and it may be “profitable” in terms of light harvesting for plants to arrange a second layer of chloroplasts. However, in terms of overall economy of cell protein and other constituents it may not be a profitable adaptation.