Abstract
HE present communication is an extension of a previous one (EKT BERG and ERIKSSON, 1965), in which a method for calculating the average meiotic stage of a certain spikelet position was presented. The method was based on the assumption that all meiotic stages from pachytene to tetrads were of equal duration which evidently is an oversimplification. Therefore, it was necessary to develop more precise methods for determining the duration of individual stages. This is of particular interest since it has been shown that some of the meiotic stages may be highly radiosensitive compared to other stages (for references cf. ERIKSSON and TAVRIN, 1965).
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