Summary
After illumination intact leaves of Zea mays contain sucrose and starch. The latter is located mainly in the bundle sheath cells. When 0.5 mm wide leaf strips are incubated with sucrose solution, the starch deposit in the bundle-sheath chloroplasts is greatly increased by light. When isolated bundle sheath cells are suspended in water or solutions of sucrose and various metabolites they are not capable of synthesizing starch. An appreciable production of starch in the chloroplasts of isolated bundle sheath cells can be observed only in the presence of glucose-1-phosphate.
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Vieweg, G.H., de Fekete, M.A.R. Die Bedeutung des Glucose-1-Phosphates für die Stärkesynthese in den Bündelscheidenzellen von Zea mays . Planta 104, 257–266 (1972). https://doi.org/10.1007/BF00387081
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DOI: https://doi.org/10.1007/BF00387081