Plant Physiology 96:1193-1195 (1991)
© 1991 American Society of Plant Biologists
Cellular and Structural Biology
Rapid Image Analysis Screening Procedure for Identifying Chloroplast Number Mutants in Mesophyll Cells of Arabidopsis thaliana (L.) Heynh. 1
Kevin A. Pyke and
Rachel M. Leech
Department of Biology, University of York, Heslington, York, United Kingdom, Y01 5DD
To analyze the genetic control of the process of chloroplast division, a direct image analysis screening procedure has been developed in which mutants of Arabidopsis thaliana (L.) Heynh. var Landsberg erecta are selected on the basis of abnormal chloroplast number. The selection procedure is based on image analysis thresholding after iodine staining, which facilitates the automatic counting of chloroplasts in isolated mesophyll cells. M2 seedlings are screened for significant deviation from the wild type relationship between mesophyll cell size and chloroplast number. Mutants with both abnormally high and abnormally low chloroplast numbers were identified. Of 3500 individual M2 seedlings screened, 18 mutant lines have been isolated and shown to be stably inherited in three subsequent generations. The most extreme phenotypes show an 80% reduction or a 50% increase in chloroplast number per mesophyll cell.
1 Supported by an Agricultural and Food Research Council (UK) PMB grant (PG87/510) to R.M.L.
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