Abstract
Seven collections of Agropyron ugamicum Drob., introduced into the United States from Central Asia in 1965, proved to be tetraploid, 2n = 28, and self-fertilizing. Hybrids were obtained between A ugamicum and six other Agropyron species with known genome constitutions: North American A. spicatum (Pursh) Scribn. & Smith, 2n = 14, SS; Middle Eastern A. libanoticum Hack., 2n = 14, SS; Eurasian A. caninum (L.) Beauv., 2n = 28, SSHH; Eurasian A. mutabile Drob., 2n = 28, SSHH; North American A. trachycaulum (Link) Malte ex H. F. Lewis, 2n = 28, SSHH; and North American A. pringlei (Scribn. & Smith) Hitchc., 2n = 28, SSHH. Chromosome pairing in triploid hybrids showed that one of the two genomes of tetraploid A. ugamicum was partially homologous with the S genome of diploid A. spicatum and A. libanoticum. Pairing in the tetraploid hybrids showed that A. ugamicum had only the S genome in common with A. caninum, A. mutabile, A. trachycaulum, and A. pringlei. The second genome of A. ugamicum is designated as Y, and the genome formula of A. ugamicum is SSYY. Species with S and Y genomes are East Asian grasses. The diploid source of the Y genome is unknown. If a YY diploid still exists, it probably occurs in Western China or Himalayan countries. All hybrids were totally sterile, which precludes introgression between A. ugamicum and the other six species. Two hybrids, A. libanoticum x A. ugamicum and A. ugamicum x A. trachycaulum, were exceptionally vigorous, and they may have economic potential as forage grasses if fertility can be restored.
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Claims 9
Claim · model-written summary
Seven A. ugamicum collections were tetraploid and self-fertilizing.
Verbatim
e0“Seven collections of Agropyron ugamicum Drob., introduced into the United States from Central Asia in 1965, proved to be tetraploid, 2n = 28, and self-fertilizing.”
Claim · model-written summary
A. ugamicum hybrids were obtained with six other Agropyron species.
Verbatim
e0“Hybrids were obtained between A ugamicum and six other Agropyron species with known genome constitutions”
Claim · model-written summary
One A. ugamicum genome was partly homologous with the S genome of A. spicatum and A. libanoticum.
Verbatim
e0“one of the two genomes of tetraploid A. ugamicum was partially homologous with the S genome of diploid A. spicatum and A. libanoticum.”
Claim · model-written summary
A. ugamicum shared only the S genome with four tetraploid Agropyron species.
Verbatim
e0“A. ugamicum had only the S genome in common with A. caninum, A. mutabile, A. trachycaulum, and A. pringlei.”
Claim · model-written summary
The authors designated the second A. ugamicum genome Y and its formula SSYY.
Verbatim
e0“The second genome of A. ugamicum is designated as Y, and the genome formula of A. ugamicum is SSYY.”
Claim · model-written summary
All hybrids were sterile, precluding introgression.
Verbatim
t0“Agropyron ugamicum”
e0“All hybrids were totally sterile, which precludes introgression between A. ugamicum and the other six species.”
Claim · model-written summary
The A. libanoticum × A. ugamicum hybrid was exceptionally vigorous.
Verbatim
e0“Two hybrids, A. libanoticum x A. ugamicum and A. ugamicum x A. trachycaulum, were exceptionally vigorous”
Claim · model-written summary
The A. ugamicum × A. trachycaulum hybrid was exceptionally vigorous.
Verbatim
e0“Two hybrids, A. libanoticum x A. ugamicum and A. ugamicum x A. trachycaulum, were exceptionally vigorous”
Claim · model-written summary
The authors proposed that the vigorous hybrids may have forage potential if fertility is restored.
Verbatim
e0“they may have economic potential as forage grasses if fertility can be restored.”
t0“Agropyron ugamicum”