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GrainGenes Reference Report: ASA-35-101

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Reference	ASA-35-101
Title	The inheritance of brittle rachis in barley
Journal	Agronomy Journal
Year	1943
Volume	35
Pages	101-106
Author	Johnson I Aberg E
Abstract	From a study of the cross Peatland X C.I 4821, two tough rachis varieties of H vulgare, complementary gene action was shown for brittle rachis The F1 generation was brittle, F2 segregation fit a ratio of 9 brittle: 7 tough, and backcross ratios of 1:1 were obtained Crosses between the two varieties of H vulgare with H agriocrithon, a brittle rachis type, each gave a 3:1 ratio for brittle vs. tough, indicating that the two dominant genes for brittle rachis carried separately in the cultivated varieties were allelic to the two dominant genes in H. agriocrithon. Ratios of 3:1 for black vs. white and long-haired vs. short-haired rachilla were obtained in the cross between the cultivated varieties and also in the crosses between the cultivated varieties and H. agriocrithon. Genes for colorless lemma and long-haired rachilla were shown to be allelic in the two species. Brittle rachis was found to be inherited independently of glume color and rachilla hair length. Glume color and rachilla hair length were also independent in their inheritance. The genetic relationship between H. vulgare and H. agriocrithon in relation to the phylogeny of the cultivated varieties of barley was discussed.
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