Abstract

A wide range of Sorghum bicolor germplasm was studied, including wild, weedy and cultivated types, several of which were from remote regions of Africa. Most of the collections proved unsuitable for pachytene chromosome measurements. Of those which were satisfactory, exhaustive studies could not establish any complete caryotypes. Of the ten chromosome pairs and five shorter pairs, however, one nucleolar pair and one asymmetric pair were distinguished. A group of three relatively long pairs and five shorter pairs were recognized but finer distinctions were not established.