CYTOGENETIC STUDIES IN THE TRIBE TRITICEAE

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Abstract
Morphological, physiological and cyto-genetical studies were made on 10 different interspecific tetraploid and hexaploid hybrids among 5 Japanese, 2 Nepalese and an American species of Agropyron. Most of the interspecific F1 plants were vigorous and in general the characters in F1 were either intermediate between the parents or superior to those of the parents. Complete pollen sterility and high seed sterility were the rule in all combinations examined. It was concluded from chromosome pairing in F1 hybrids as follows 2 genomes of Japanese tetraploid species, A. ciliare and A. yezoense, were very similar; 2 Japanese hexoploid, A. humidum and A. tsukushiense, had quite identical genoms; genomes of a Nepalese tetraploid species. A. semicostatum, were closely related to those found in Japanese tetraploid species; and an American tetraploid species, A. trachycaulum. possessed genomes distantly related to those of Japanese tetraploid species.