CYTOGENETICS OF SOME MONOTELOTRISOMICS IN BARLEY

Abstract

Linkage markers and translocation stocks were used to identify four monotelotrisomics in barley as 14 + 1S, 14 + 2L, 14 + 4L, and 14 + 5S. In morphology they displayed the same deviations from disomic plants as the corresponding primary trisomics but to a lesser extent, ranging from an approach to the disomic for 14 + 1S to close resemblance to the trisomic for 14 + 2L. At meiotic metaphase, an average of 61.1% of the cells contained heteromorphic trivalents, with tandem-chain and ring-rod configurations predominating. The extra telocentrics were transmitted to 28.3% of selfed progeny, almost exclusively through the female gamete.