6頁7000余字

摘 要：對分布于中國西北地區(qū)的3種黃耆屬植物進行了細胞學研究，核型研究結果表明，3種黃芪屬植物均為二倍體。3個種的染色體數(shù)目和核型公式分別為：單葉黃耆（A. efoliolatus）2n=16=12m（2SAT）+4sm，“1A”核型；太原黃耆（A. taiyuanensis）2n=16=14m（2SAT）+2sm，“1A”核型；變異黃耆（A. variabilis）2n=16=4m+10sm（2SAT）+2st，“3A”核型。除變異黃芪的染色體數(shù)目和核型有過報道外，其余2種的染色體數(shù)目及核型均為首次報道。
關鍵詞：黃耆屬；細胞學；核型；西北地區(qū)

Studies on cytology of 3 Astragalus species from Northwestern China
Abstract: The chromosome numbers and karyotypes of three Astragalus species from northwestern China are reported in this paper. The results of karyotype research show that all 3 species are diploid. Their chromosome numbers and karyotypes are formulated as follows: A. efoliolatus, 2n=16=12m(2SAT)+4sm, “1A” type; A. taiyuanensis, 2n=16=14m(2SAT)+2sm, “1A” type; A. variabilis, 2n=16=4m+10sm (2SAT)+2st, “3A” type; The chromosome numbers and karyotypes of all the 3 species are reported for the first time except A. variabilis.
Key words: Astragalus, chromosome number, karyotype, Northwestern China
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