CAJ | 학술논문

广义拂子茅属(Calamagrostis)是一个世界温带广布的大属,有些作者又分为拂子茅属和野青茅属,但近期的研究表明处理为一个属较为合适.中国共有37种广义拂子茅属植物,但至今没有任何染色体的研究.本文报道了其中产于中国西南6种野青茅的染色体数目,其中Deyeuxia petelotii 4个居群,D.diffusa,D.moupinensis,D.nivicola和D.flavens各一个居群都是四倍体(2n=4x=28),D.neglecta为六倍体(2n=6x=42).根据广义拂子茅属植物染色体倍性特征,该属植物中至今未发现二倍体,四倍体是该属中倍性最低和最普遍的,广义拂子茅属的演化很可能是在四倍体的水平上进行的.由于以上几个四倍体种均是狭域分布的类群,所以可能是由四倍体的祖先隔离分化形成的.
엄의불자모속(Calamagrostis)시일개세계온대엄포적대속,유사작자우분위불자모속화야청모속,단근기적연구표명처리위일개속교위합괄.중국공유37충엄의불자모속식물,단지금몰유임하염색체적연구.본문보도료기중산우중국서남6충야청모적염색체수목,기중Deyeuxia petelotii 4개거군,D.diffusa,D.moupinensis,D.nivicola화D.flavens각일개거군도시사배체(2n=4x=28),D.neglecta위륙배체(2n=6x=42).근거엄의불자모속식물염색체배성특정,해속식물중지금미발현이배체,사배체시해속중배성최저화최보편적,엄의불자모속적연화흔가능시재사배체적수평상진행적.유우이상궤개사배체충균시협역분포적류군,소이가능시유사배체적조선격리분화형성적.
Calamagrostis s.l.is a large genus widespread throughout the world in temperate and cold regions.It is sometimes divided into two genera:Calamagrostis s.str.and Deyeuxia,and both have been accepted in China,while recent studies show it should be treated as one genus.There are 37 species of Calamagrostis s.l.occuring in China,but no cytological study was conducted before.In this paper the chromosome numbers of 9 populations representing 6 species of Deyeuxia (recognized as a part of Calamagrostis s.l.) from southwestern China are reported for the first time.Most of them are tetraploids and no diploid species is found.All 4 populations of D.petelotii and each population of D.diffusa,D.moupinensis,D.nivicola,and D.flaven are tetraploids (2n=4x=28),and the only population of D.neglecta is hexaploid (2n=6x=42).On the basis of these counts and previous reports,tetraploid is again confirmed primitive in Calamagrostis s.l.and the speciation of the genus is principally occurred at tetraploid level in this region.As these five tetraploid species are restricted to Himalayan-Hengduan Mountains,they probably have been formed by isolation from tetraploid ancestors.