GrainGenes

II.5. Trisomic analysis of several scald and net blotch resistance genes.

H. E. Bockelman, E. L. Sharp, and R. F. Eslick, Plant Pathology and Plant and Soil Science Depts., Montana State University, Bozeman, MT 59715, USA.

The seven primary trisomics of Betzes (Eslick and Ramage, 1969) were used as the female parent in crosses with:

1. Kitchin, C.I. 1296, resistant to barley scald,
2. Jet, C.I. 967, resistant to barley scald,
3. Tifang, C.I. 14373, resistant to net blotch,
4. C.I. 9819, resistant to net blotch,
5. C.I. 7584, resistant to net blotch.

F2 segregation for disease reaction was studied in the above crosses. No attempt was made to separate diploids from trisomics in the F2. Tables 1 thru 5 illustrate the results. Table 6 shows the proposed gene designations and chromosomal associations. Scald resistance genes were associated with chromosomes 3 and 4. Net blotch resistance genes were associated with chromosomes 2, 3, and 5.

Table 1. Scald reaction class frequencies of F2 seedlings of the Betzes primary trisomics x Kitchin.

Table 2. Scald reaction class frequencies of F2 seedlings of the Betzes primary trisomics x Jet.

Table 3. Net blotch reaction class frequencies of F2 seedlings of the Betzes primary trisomics x Tifang.

Table 4. Net blotch reaction class frequencies of F2 seedlings of the Betzes primary trisomics x C.I. 7584.

Table 5. Net blotch reaction class frequencies of F2 seedlings of the Betzes primary trisomics x C.I. 9819.

Table 6. Proposed gene designations and chromosome associations for cultivars in this study.

References:

Eslick, R. F. and R. T. Ramage. 1969. Primary trisomics in the variety Betzes. 1968 Barley Newsletter 12:17.

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