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中文摘要：
对禾本科小麦族拟鹅观草属物种Pseudoroegneria geniculata、P.geniculata ssp.scythica和P．geniculata ssp．pruinifera的核型进行了研究。结果显示：P．geniculata和P．geniculata ssp．scythica为四倍体物种，P．geniculata ssp．pruinifera为六倍体物种；P．geniculata、P．geniculata ssp．scythica和P．geniculata ssp．pruinifera的核型公式分别为2n=4x=28=18m（2sat）＋10sm（2sat）、2n=4x=28=28m（2sat）和2n=6x=42=36m（6sat）＋6sm（2sat）；P．geniculata和P．geniculata ssp．pruinifera为2A核型，而P．geniculata ssp．scythica为1A核型。研究表明：3种植物的核型存在差异；P．geniculata ssp．pruinifera的核型为首次报道，其核型明显不同于P．geniculata和P．geniculata ssp．scythica。
英文摘要：
The karyotypes of Pseudoroegneria geniculata ,P. geniculata ssp. scythica and P. geniculata ssp. pruinifera were studied. The results indicated that： P. geniculata and P. geniculata ssp. scythica were tetraploids,while P. geniculata ssp. pruinifera was hexaploid; The karyotype formulas of P. geniculata, P. geniculata ssp. scythica and P. geniculata ssp. pruini fera were 2n=4x=28=18m（2sat） ＋10sm（2sat）, 2n=4x=28=28m（2sat） and 2n=6x=42=36m（6sat）＋6sm（2sat）,respectively;The karyotype of P. geniculata and P. geniculata ssp. pruinifera were 2A types, while P. geniculata ssp. scythica was 1A type. This demonstrated that there were variations among the kayotypes of the three taxa;The kayotype of P. geniculata ssp. pruinifera was first reported,and was obviously different to that of P. geniculata and P. geniculata ssp. scythica.
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