There are well over a thousand races of Grain Sorghums under cultivation all over the world. Without an exception all of them are diploid with 2n = 20 chromosomes. Haploids and triploids have been reported as rare occurrents (Brown 1943; Price and Ross 1955). Under experimental conditions Chin (1946) by colchicine treatment produced autotetraploids and octaploids. But these were partial steriles. There have been no naturally occurring tetraploids of Grain Sorghums reported so far.
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