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Journal of Cell Science, Vol 56, 293-302, Copyright © 1982 by Company of Biologists

Submitted on December 21, 1981

Proplastid Dna Synthesis at Pachytene in Pollen Mother Cells of Lilium Henryi

D. R. SMYTH 1

1 CSIRO Division of Plant Industry, P.O. Box 1600, Canberra City, A.C.T. 2601, Australia; Department of Genetics, Monash University Clayton; Victoria 3168, Australia

About three-quarters of the DNA synthesis occurring in pachytene pollen mother cells of Lilium henryi takes place in proplastids. Only around 15% can be attributed to mitochondrial labelling and 10% to nuclear DNA synthesis. Label was identified in the proplastid genome by its location in electron microscopic autoradiographs, by its buoyant density (1.698 g/ml), and by its specific hybridization to chloroplast DNA sequences from spinach. Proplastids, while apparently not dividing at pachytene, may be replicating their DNA in readiness for subsequent proliferation in developing microspores. The annealing properties of plastid DNA closely parallel those of labelled pachytene DNA sequences implicated in meiotic exchange events.

Submitted on December 21, 1981






© The Company of Biologists Ltd 1982