Abstract
A developmental gradient was confirmed by sequential transverse sections of tomato anthers and used to determine the sequence of chromosome behaviour during meiotic prophase. Most of meiosis corresponds to earlier descriptions, but two unusual behaviours were observed, the aggregation of the chromosomes into a synizetic knot during zygotene, and the delayed contraction of chromosomes during a diffuse stage after pachytene. Both behaviours were found in pollen mother cells of species in the genera Lycopersicon, Solanum, Nicotiana, Capsicum and Datura, and in egg mother cells of the cultivated tomato and of Solanum pennellii.
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