青藏高原东南缘五种火绒草属植物的核型  

Karyotypes of Five Leontopodium Species from the Southeastern Qinghai-Tibet Plateau, Southwest China

作　　者：王广艳[1,2,3] 孟盈[1,2,4] 聂泽龙[1] 杨永平[1,2,4] 

机构地区：[1]中国科学院昆明植物研究所生物多样性与生物地理学重点实验室,云南昆明650201 [2]中国科学院昆明植物研究所西南野生生物种质资源库,云南昆明650201 [3]中国科学院大学,北京100049 [4]中国科学院青藏高原研究所昆明部,云南昆明650201

出　　处：《植物分类与资源学报》2013年第3期355-360,共6页Plant Diversity

基　　金：科技部科技基础性工作专项重点项目(2007FY110100);国家自然科学基金项目(31270273;41271058);中国科学院生命科学领域基础前沿专项项目(KSCX2-EW-J-24);国家重点基础研究发展计划(2010CB951704)

摘　　要：报道我国青藏高原东南缘5种6个居群火绒草属植物的染色体数目和核型。银叶火绒草Leontopodium souliei 2n=2x=24=13M+8m+3sm,1B;坚杆火绒草L.franchetii 2n=2x=26=6M+18m+2sm,2A;华火绒草L.sinense;四川木里海拔2406m的居群:2n=2x=26=4M+22m,1B,四川木里海拔3074m居群:2n=4x=52=16M+36m,1B;美头火绒草L.calocephalum 2n=4x=48=3M+43m+2sm,1B;毛香火绒草L.stracheyi 2n=4x=48=13M+35m,1A。对现有的染色体资料分析表明:火绒草属的染色体核型比较对称,但种间具一定的变异;多倍化可能是该属在我国青藏高原及其周边地区发生强烈物种分化的重要原因之一。The chromosome numbers and karyotypes of five species of the genus Leontopodium （Asteraceae） from Southeastern Qinghai-Tibet Plateau, Southwest China were investigated. Three species were studied karyomorpholog- ieally and reported for the first time ： L. franchetii 2n = 2x = 26 = 6M＋ 18m＋2sm, 2A ; L. calocephalum 2n = 4x = 48 = 3M＋43m＋2sm, 1B; L. stracheyi 2n=4x=48= 13M＋35m, 1A. Two species L. souliei and L. sinense presented dif- ferent chromosome numbers and karyotypes from the previous reports, that is, L. souliei 2n = 2x = 24 = 13 M ＋ 8m＋ 3sm, 1B; L. sinense, the population collected at altitude 2 406 m a.s.1. Muli County, Sichuan Province： 2n=2x= 26 = 4M＋22m, 1 B, the population collected at altitude 3 074 m a. s. 1. Muli County, Sichuan Province ： 2n = 4x = 52 = 16M＋36m, 1B. The comparison of existent chromosomal data indicates that Leontopodium is a genus with symme- try karyotype, but diversified obviously among different species. Polyploidization might have played an important role in the speeiation and evolution of Leontopodium on the Qinghai-Tibet Plateau and its southeastern peripher- al regions.

关 键 词：火绒草属 青藏高原 染色体数目 核型 多倍体 

分 类 号：Q943[生物学—植物学]