By H. W. Woolhouse
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1980). , 1980)then RuBPc’ase may be rate-limiting under low irradiance as well. Hence the spatial competition between the carboxylating apparatus and the electron transport and light-harvesting apparatus must then be extreme. ) bodies attached to the thylakoids. B). Therefore, as discussed below, not only spatial economy, but nitrogen economy must be an important factor. 7 . Nitrogen Economy Versus Light liurvesting Cupacit!. As shown above both the C0,-fixing apparatus and light-harvesting apparatus require large amounts of protein and both may sequester large proportions of total cell nitrogen.
LARKUM A N D JACK BARRETT to PSII, then according as to whether the trap is open or closed the excitation energy is used or is redirected to PSI; thus the rate of spillover is related to the turnover rate of PSII. Neither of these hypotheses takes into account the fact that in higher plants (and possibly in those algae which contain LHCP) there may be extreme lateral heterogeneity of the photosystems in the thylakoids (Anderson and Anderson, 1980; Anderson, 1981; Anderson and Anderson, 1982), resulting in many PSI units being effectively isolated from PSII units.
A) An electron microscope section of a cell pf Prochloron (Prochlorophyta) from Dzdemnum molk ( x 15 000). ,1982). Both cells were fixed in glutaraldehyde and osmium tetroxide and post-stained in uranyl acetate and lead citrate. (Micrographs by G . ) Fig. 13. Electron microscope sections to show characteristic thylakoid structure of (a) Lyngbya sp (Cyanobacteria), (b) Haliptilon cuvieri (Rhodophyta), (c) Chroomonas sp (Cryptophyta), (d) Prorocentrum micans (Dinoflagellata), ( e ) Ecklonia radiata (Phaeophyta), (f) Dunaliella tertiolecta (Chlorophyta) ( x 60 000).