Cytogenetical studies on the intergeneric hybrids between Triticum and Agropyron:I. The meiotic behaviour and the morphology of F1 hybrids between Triticum vulgare Vill. and Agropyron glaucum Roem. et Schult

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To breed the leaf-rust resistant varieties of wheat by hybridization, interspecific or intergeneric, Agropyron glaucum Roem, et Schult. was adopted as the source of resistance. But, at the same time, such aim was included in this experiment as to make the perennial wheat for the fodder of domestic animals.Crossing was made between common wheat (including amphidiploid, AAGGDD) and Agropyron glaucum by using the latter species as the pollen parent. Consequently, it was found out that:1) The cross-abilities are markedly different in different combinations.2) The chromosome configurations and their frequencies in MI in meiosis are also so (see Table 2).3) Judging from the number of bivalents observed, it was ascertained that at least one genome is common between these parental species.4) F1 plants showed complete self-sterility, but were slightly fertile by backcrossing with the pollens of vulgare parents.5) Morphologically F1's manifested strongly the characters of the pollen parent, Agropyron glaucum through their whole life, resulting in the perennial grasses. They are resistant to diseases, droughtness and are winter-hardy. Especially, tillering-ability is so superior that they will be valuable as the materials for breeding the fodder plants in future.
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