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By H. W. Woolhouse

ISBN-10: 012005910X

ISBN-13: 9780120059102

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2. Pigment Arrays A basic condition of photosynthetic pigments in all photosynthetic organisms, including photosynthetic bacteria, is the arrangement of pigments in cooperative arrays (Junge, 1977). These arrays, composed of pigment-proteins (Section VII), greatly increase the probability of lightcapture of each unit by increasing the optical cross-sectional area. This allows a greater turnover of each reaction centre, which carries out photochemical conversion (Section IV), and results in a more efficient use of the photosynthetic machinery.

B). B). The thickness of the thylakoid membrane is approximately 5 nm (Wanner and Kost, 1980). ( f ) Crjptophjlta. In the Cryptophyta, thylakoids are characteristically found in pairs (Fig. 13) although triplets also occur. The thylakoids are rather loosely held together in many species but more tightly in others. The thylakoid membrane thickness is quite variable and may be as thick as 36nm (Wehrmeyer, 1970). , 1971; Faust and Gantt, 1973). (g) Chloroplast arrangement. Light harvesting on a cell basis can theoretically be increased by increasing the number or size of chloroplasts per cell.

The thylakoids lie singly in the stroma, often parallel to one another but separated by a space 40-50 nm thick. The spacing is occasioned by the presence, as in Cyanobacteria, of PBS, with a diameter of 3 0 4 0 nm. The PBS are arranged in regular arrays and are attached by a stalk to the adjacent thylakoid membrane. In close-packed configuration (in shade algae) the PBS, attached to one membrane, alternates with the phycobilisome attached to the neighbouring membrane (Fig. B). However much looser arrangements are seen in sun plants.

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Advances in Botanical Research, Vol. 10 by H. W. Woolhouse

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