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Comparative Culm Elongation Rates of Isogenic Sorghum Lines Differing by a Single Height Gene (Dw₃)¹

Results of a preliminary study comparing culm elongation rates of isogenic lines of ‘Japanese Dwarf’ broomcorn (Sorghum bicolor (L.) Moench) differing by a single height (Dw₃) gene are reported. Culm elongation proceeded slowly until 36 to 39 days after seedling emergence and then proceeded rapidly until near the time of anthesis. The line with dominant Dw₃ had a much more rapid and extensive internode elongation than did the line with dw₃. A possible relationship between floral initiation and the period of rapid culm elongation and the differential rate of culm elongation is indicated.

Key Words: Japanese Dwarf broomcorn • Plant development • Floral initiation • Sorghum bicolor (L.) Moench

² NDEA Fellow, Kansas State University; and Research Agronomist, Crops Research Division, ARS, USDA, respectively, Manhattan, Kans. 66502.

Received for publication December 13, 1969.