Cytological Studies in Saccharum and Allied Genera. III. Chromosome Numbers in Interspecific Hybrids

Chromosome numbers in various interspecific Saccharum hybrids are reported. Aneuploid chromosome numbers which deviate greatly from any possible "expected" numbers are found only in false or doubtful hybrids. Otherwise, the results of earlier studies are generally supported. For the first time a relatively large number of S. officinarum x S. robustum hybrids have been studied, and all have n + n chromosome numbers. 2. Chromosome numbers are given for the following hybrid types not previously recorded in the literature: S. officinarum x 96-chromosome S. spontaneum n + n and 2n + n S. officinarum x 128-chromosome S. spontaneum 2n + n S. sinense (Pansahi group) x S. officinarum n + n and n + 2n S. sinense (Sunnabile group) x S. spontaneum n + n 3. Literature dealing with chromosome numbers in interspecific and intergeneric hybrids of Saccharum is reviewed and discussed.