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PLANT PHYSIOLOGY , Vol 104, Issue 1 201-207, Copyright © 1994 by American Society of Plant Biologists

DEVELOPMENT AND GROWTH REGULATION

A Genetic Analysis of Chloroplast Division and Expansion in Arabidopsis thaliana

K. A. Pyke and R. M. Leech
Department of Biology, University of York, Heslington, York, YO1 5DD, United Kingdom

A nuclear recessive mutant of Arabidopsis thaliana, arc5, has been isolated in which there is no significant increase in chloroplast number during leaf mesophyll cell expansion and in which there are only 13 chloroplasts per mesophyll cell compared with 121 in wild-type cells. Mature arc5 chloroplasts in fully expanded mesophyll cells are 6-fold larger than in wild-type cells. A large proportion of arc5 chloroplasts also show some degree of central constriction, suggesting that the mutation has prevented the completion of the chloroplast division process. To examine the interaction of arc loci, a double mutant was constructed between arc1, a mutant possessing many small chloroplasts, and arc5. A second double mutant was also constructed between arc3, a previously discovered mutant also possessing few large chloroplasts per cell, and arc1. Analysis of these double mutants shows that chloroplast number per mesophyll cell is greater when arc5 and arc3 mutations are expressed in the arc1 background than when expressed alone. The cell-specific nature of arc mutants was also analyzed. The phenotypic traits characteristic of arc3 and arc5 are a reduction in chloroplast number and an increase in chloroplast size in mesophyll cells: these changes are also observed in reduced form in the epidermal and guard cell chloroplasts of arc3 and arc5 plants. Analysis of parenchyma sheath cell chloroplasts suggests that in leaves of arc1 plants the normal developmental distinction between mesophyll and parenchyma sheath chloroplasts is perturbed. The relevance of these findings to the analysis of the control of chloroplast division in mesophyll cells is discussed.


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