Polyploidy and new chromosome counts in Anaphalis (Asteraceae: Gnaphalieae) from the Qinghai-Tibet Plateau of China

被引:16
作者
Meng, Ying [1 ,2 ]
Sun, Hang [1 ]
Yang, Yong-Ping [1 ,2 ]
Nie, Ze-Long [1 ]
机构
[1] Chinese Acad Sci, Kunming Inst Bot, Lab Biodivers & Biogeog, Kunming 650204, Peoples R China
[2] Chinese Acad Sci, Inst Tibetan Plateau Res Kunming, Kunming 650204, Peoples R China
基金
中国国家自然科学基金;
关键词
Anaphalis DC; Asteraceae; chromosome number; Gnaphalieae; polyploidy; Qinghai-Tibet Plateau; HENGDUAN MOUNTAINS REGION; KARYOTYPES; SENECIONEAE; UNIFORMITY; EVOLUTION; NUMBERS; FLORA; GENUS;
D O I
10.1111/j.1759-6831.2009.00061.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Anaphalis is one of the largest genera of the Asian Gnaphalieae (Asteraceae) and is most diversified on the Qinghai-Tibet Plateau. The chromosome numbers and karyomorphology of six species from seven populations were investigated for the first time for this region. Chromosome numbers have been newly documented for four species: Anaphalis deserti (2n = 56 = 24 median [m] + 24 submedian [sm] + 8 acrocentric [st]); Anaphalis plicata (2n = 56 = 26m + 30sm); Anaphalis xylorhiza (2n = 28 = 2 median point [M] + 14m + 12sm); and Anaphalis rhododactyla (2n = 56 = 32m + 24sm). Two further counts are in agreement with the previously reported numbers, that is, Anaphalis royleana (2n = 28 = 4M + 6m + 18sm) and Anaphalis margaritacea (2n = 28 = 12m + 16sm). A new polyploid cytotype (2n = 56 = 26m + 30sm) was found in the Zougong population of A. margaritacea. Polyploidy is for the first time reported for Anaphalis, with four out of seven counts being tetraploid. Our cytological results suggest that polyploids might have played an important role in the evolution of Anaphalis on the Qinghai-Tibet Plateau.
引用
收藏
页码:58 / 64
页数:7
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