Agropyron tsukushiense×Hordeum bulbosum(4X)〔英文〕

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In order to obtain polyhaploids in the genus Agropyron by "the bulbosum method", nine species were pollinated by Hordeum bulbosum (4x). Among progenies obtained by embryo culture, six plants did not show the elimination of any chromosomes derived from H. bulbosum and were intergeneric hybrids between A. repens or three ecotypes of A. tsukushiense and H. bulbosum. Out of six hybrids obtained, two plants of A. tsukushiense EE-4 or ST-1× H. bulbosum (4x) (2n=34 or 2n=35) were examined morphologically and cytologically. These hybrids were shorter, but had numerous tillers. They were completely sterile. The spike morphology resembled the female parent rather than the intermediate between the parents. Several characteristics of the pollen parent were also observed in these hybrids. The average chromosome pairing per cell at MI of PMCS in A. tsukushiense EE-4 and ST-1×H. bulbosum hybrids was 2.8II+28.4I and 4.6II+25.8I, respectively. The loosely associated bivalent formation, a rare occurrence of the cells with more than seven bivalents, and the absence of multivalent association in these hybrids suggest a lack of segmental homology among the chromosome complements of three genomes of A. tsukushiense and two of H. bulbosum.The production of these intergeneric hybrids suggests that the genome balance hypothesis proposed in interspecific hybrids of Hordeum can not beapplicable to the intergeneric hybrids between Agropyron and H. bulbosum.
日本遺伝学会の論文

Agropyron tsukushiense×Hordeum bulbosum(4X)〔英文〕

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