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A quantitative model based on plasmodesmatal-mediated diffusion of metabolites supported the plausibility of such a system (Osmond and Smith, 1976; Hatch and Osmond, 1976). , 1970; Hatch and Kagawa, 1976; see Hatch, 1987). Later, a procedure was developed to directly measure the permeability of isolated bundle sheath cells to 30 Marshall D. , 1988) giving permeability coefficients averaging about 3/xmol min -1 mg -1 Chl for a 1 m M gradient. This would suggest that gradients of only about 2 to 3 m M between mesophyll and bundle sheath would be sufficient to give fluxes matching maximum photosynthesis rates.
2. NADP Malate Dehydrogenase As already mentioned, NADP-MDH was one of the two new enzymes discovered during the course of elucidating the Ca pathway (Hatch and Slack, 1969b). Soon after, this enzyme was shown to be dark-light regulated in leaves and, like several PCR-cycle enzymes, this apparently involved interconversion between an active dithiol form of the enzyme and an inactive disulfide form (Johnson and Hatch, 1970). It is interesting to recall that some of the subsequent developments in the elucidation of this regulatory process.
Chapman, K. S. , Berry, J. , and Hatch, M. D. (1980). Photosynthetic metabolism in the bundle sheath cells of Zea mays: Sources of ATP and NADPH. Arch. Biochem. Biophys. 202, 330-341. , and Ogren, W. L. (1975). Regulation of photorespiration in C~ and C4 species. Botan. Rev. 41, 137-179. , and Baldry, C. W. (1972). C4-pathway in Pennisetum purpureum. Nature 238, 268-270. Cooper, R. , and Kornberg, H. L. (1965). Net conversion of pyruvate to phosphoenolpyruvate in Escherichia coli. Biochim. Biophys.