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Alien sorghums from the world collection of sorghums are being converted to early, combine‐height strains adapted, to the United States and other temperate areas. Conversion is being accomplished by a crossing and backcrossing program in Puerto Rico under favorable shortday photoperiods during the winter, with selection for early, short genotypes within segregating populations in Texas under long‐day conditions during the regular growing season. After 2½ years of work on the conversion program, the procedure has proved workable, with only minor changes in time of seeding. Data indicate that the majority of alien strains used segregate for three to four height or maturity genes when crossed to a 4‐dwarf early line.
Stephens et al. (Sat,) studied this question.