Cytogenetical Studies in the Inbred Lines of Radish (Raphanus sativus L. var. radicols Pers.) and their Hybrids. I. Chiasma Frequency

Abstract

Mean chiasma frequency at diakinesis has been studied in three intered lines of radish, namely LS-337/24, LS-337/25 and LS-43/51, their F₁ hybrids and the population. It has been demonstrated that the lines significantly differ among themselves and from the original population in this character. All the lines show a marked reduction in mean chiasma frequency in comparison to the population whereas the interlinear hybrids F₁ are characterized by increase of this mean which touches almost the population level. From our results it is quite obvious that the breakdown and restoration of chromosome pairing are concomitant with the mating system of the species. A genotypic control of mean chiasma frequency has been proposed in radish.