"Establishment of GISH and multi-color GISH techniques to simultaneously discriminate different genomes in Erianthus procerus x Saccharum officinarum introgressed clones "

An attempt was made to identify the chromosomes from different species genomes in BC₂ progenies of Erianthus procerus x Saccharum officinarum through multi-color GISH (MCGISH). The BC₂ population was derived from the cross between a BC1 hybrid (GU 12-14) and a commercial variety, Co 16018. The BC2 progenies were studied for their somatic chromosome number and two cytotypes were observed, i.e., 2n=92 (2) and 2n=96 (5). GISH revealed that the majority of progenies were having nine Erianthus chromosomes, except 2 clones (25-5 and 25-10) were having nine Erianthus chromosomes with one chromosome fragment. The methodology for multi-color GISH was standardized and it distinguished the chromosomes from different genomes. Interspecific recombination was also detected in somatic cells of one BC₂ clone, 25-10. The hybridity of the introgressed lines has been confirmed with amplification of Erianthus specific tandem repeat sequences.