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Annals of Botany 72: 205-211, 1993
© 1993 Annals of Botany Company

Some Factors Concerning the Centripetal Disposition of Bundle Sheath Chloroplasts during the Leaf Development of Eleusine coracana

Hiroshi Miyake and Motoya Nakamura

Laboratory of Biological Resources and Environmental Sciences, School of Agriculture, Nagoya University, Chikusa, Nagoya 464-01 and Department of Environmental Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183, Japan;

Factors concerning the chloroplast disposition in bundle sheath cells were investigated in finger millet (Eleusine coracana Gaertn.), and NAD malic enzyme type C4 plant with the centripetal arrangement of bundle sheath chloroplasts. Segments were cut from immature regions of emerging leaves in which the centripetal arrangement of bundle sheath chloroplasts had not yet been established. The leaf segments were floated on solutions with or without reagents. Sections were made of the segments at time intervals and the distribution of bundle sheath chloroplasts was observed by light microscopy. The bundle sheath chloroplasts migrated to the vascular bundle and established a centripetal arrangement by 12-16 h in control solutions. Auxins, cycloheximide and cytochalasin B inhibited the disposition of bundle sheath chloroplasts while chloramphenicol and colchicine had no effect. The inhibitory effect of auxins appeared only at early stages of chloroplast migration while cycloheximide and cytochalasin B were effective even at later stages. Cessation of elongation growth, cytoplasmic protein synthesis and microfilaments seemed to be associated with the centripetal disposition of bundle sheath chloroplasts.Copyright 1993, 1999 Academic Press

Bundle sheath chloroplast, C4 plant, chloroplast orientation, Eleusine coracana, finger millet


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