Allelic relationships and inheritance of brown midrib trait in sorghum
Gupta, S.C.
Four naturally occurring brown midrib mutants in sorghum [Sorghum bicolor (L.) Moench.] identified in 1989 in germplasm from Malawi, and three brown midrib lines previously developed at Purdue University through induced mutations (bmr-6, bmr-12, and bmr-18) were considered in this study. Allelism tests in these seven lines revealed that the four naturally occurring brown midrib lines are allelic to each other and to bmr-6. These five lines were nonallelic to bmr-12 and bmr-18, whereas bmr-12 and bmr-18 were allelic to at least those genes necessary to express brown midrib trait. Inheritance of the trait in F1 and F2 populations derived from 15 crosses between nine normal midrib parents and three brown midrib lines was then studied. Results revealed that the brown midrib trait is controlled, at least in part, by genes at two or more independent loci in the nuclear genome of sorghum. There is a strong possibility that some modifying genes may affect the expression of this trait. In general, 15% to 45% of plants with brown midrib can be expected in F2 populations segregating for this character.
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