Abstract
In tulip anthers meiosis begins first in the pollen mother cells next to the point of entry of the vascular bundle at the base. It then proceeds in a wave to the free end of the anther. The first cells to pass through meiosis have the lowest chiasma frequency and cells with a lower cell chiasma frequency have a lower total bivalent length. It is suggested that some factor which passes through the vascular bundle may cause the developmental variations in chiasma frequency possibly by first altering chromosome length (Summary see p. 179.)
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Couzin, D.A., Fox, D.P. Variation in chiasma frequency during tulip anther development. Chromosoma 46, 173–179 (1974). https://doi.org/10.1007/BF00332515
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DOI: https://doi.org/10.1007/BF00332515