Abstract
Twin seedlings, which often are polyploid or aneuploid, of Avena byzantina C. Koch var. Kanota were successfully used as a source of monosomics. Progenies of monosomic plants were grown in the nursery and were compared for frequencies of 40-, 41-, and 42-chromosome segregates, culm and panicle length, fertility, and certain other discriminating phenotypic characteristics. Monosome length and long-arm ratio, and ratio of 20- to 21-chromosome pollen based on univalent elimination were determined for each line. It is tentatively concluded that at least 12 or 13 different monosomic lines were identified among 17 lines studied. Nullisomics were found only among progenies in line Mk-9, a monosomic fatuoid. Awn development on nulli-, mono-, and disomics in this line suggests that genes in one or more chromosomes, in addition to those in the C chromosome, affect the inhibition of awn development.
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