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Trisomic Transmission in Six Primary Trisomics of Sorghum¹

Transmission rates of the extra chromosomes in six primary trisomics of sorghum (Sorghum bicolor (L.) Moench) were estimated by examining the progeny of selfed trisomics and the progeny when the trisomics were crossed to disomics. When the trisomics were selfed, ‘cone’ had the highest transmission rate (29.3%) and ‘small glume’ the lowest (5.0%). When the trisomics were used as females in crosses with disomics, cone also had the highest transmission rate and small glume the lowest; when the trisomics were used as males in crosses to disomics, transmission rate was greatly reduced in general. Variation in transmission rate was observed from plant to plant for the same trisomic type. Study of the transmission rate of the extra chromosome indicated that the following factors probably were contributing to the lower rate: small or light weight seeds tended to have a higher proportion of trisomics than heavier seeds; lighter seeds had a lower percentage germination; the extra chromosome was often eliminated during meiosis; trisomic plants were less vigorous than disomics and tended to die prematurely. Frequency of aborted pollen in trisomics did not seem to be related to the deviation from expected frequency.

Key Words: Chromosome elimination • Microsporocyte • Meiosis • Tetrasomics • Sorghum bicolor (L.) Moench

² Research cytogeneticist, Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506.

Received for publication July 5, 1978.