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Inheritance of Papery Glume and Cleistogamy in Sorghum¹

Cleistogamous spikelets in sorghum [Sorghum bicolor (L.) Moench] form when the inner glume is rolled, clasping the internal flower structures and preventing normal opening of the glumes. Cleistogamy is controlled by two independently-inherited genes. Indurate (hard) glume is dominant to papery glume. The rolled glume condition is dominant to unrolled. Indurate glume is epistatic to rolling, and only papery glumes can exhibit rolling. The F₂ ratios from the cross (indurate glume x cleistagamous) show a good fit to a 12:3:1 ratio of induratercleistogamous (papery-rolled): papery-unrolled. This cleistogamy cannot be used to breed hybrids resistent to sorghum midge because one parent would be cleistogamous and prevent production of hybrid seed.

Key Words: Sorghum bicolor (L.) Moench • Sorghum midge • Glume length • Rolled glume • Sorghum genetics

² Respectively, professors, Dep. of Agronomy, and former graduate research assistant (deceased). Dep. of Agronomy, Mississippi State Univ.

Received for publication October 6, 1980.