DEVELOPMENT AND CHARACTERISTICS OF A DISOMIC-1D ADDITION LINE OF DURUM WHEAT

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Abstract
A pair of chromosomes from Chinese Spring hexaploid wheat (Triticum aestivum L.) was added to the tetraploid durum wheat (Triticum turgidum L.) cultivar Langdon. Crosses between this disomic-addition line and Chinese Spring ditelosomic 1DL produced progeny with 14 pairs + 1 heteromorphic bivalent + 6 univalents (14″ + t1″ + 6′). Therefore, this durum line with 15 pairs of chromosomes is a 1D-disomic addition line to Langdon durum wheat. Seed from the 1D-disomic addition line produced two high-molecular-weight glutenin polypeptide subunits not present in durum wheats, as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. These polypeptides were similar to those present in Chinese Spring. Semolina milled from seed of the 1D-disomic addition line had very strong mixing properties, as determined by the micro-mixograph, and 2% higher protein than the recurrent parent Langdon or other durum varieties. The amino acid content of the line was similar to that of the other durums.

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