山茶属5种植物的核型研究

 本文报道了山茶属5种植物的核型:1.矩叶茶Camellia grijsii Hance核型公式为2n=2x=30=20m+7sm+3st;2.文山毛蕊茶C.wenshanensis Hu核型公式为2n=2x=30=20m+8sm+2st;3.紫果茶C.purpura Chang et Chen核型公式为2n=2x=30=22m+4sm+4st;4.显脉金花茶C.euphelebia Merr.ex Sealy核型公式为2n=2x=30=21m(4sat)+9sm(2sat);5.五柱滇山茶C.yunnanensis(Pitard ex Diels)Cohen Stuart核型公式为2n=2x=30=26m(2sat)+4sm.这5种植物分属不同的亚属及组.结果表明它们均是二倍体2n=30,但核型结构明显不同.核型类型前2种属2A型,后3种属2B型.

Studies on the Karyotypes of Five Species of Camellia

The authors reported the karyotypes of 5 species of Camellia. Their karyotype formulas are as follows: 2n=2x=30=20m+7sm+3st of Camellia grijsii Hance; 2n=2x=30=20m+8sm+2st of C.wenshanensis Hu; 2n= 2x= 30 =22m+4sm+4st of C.purpura Chang et Chen; 2n=2x=30=21m (4sat) +9sm (2sat) of C.euphelebia Merr.ex Sealy; 2n=2x=30=26m ( 2sat) +4sm of C.yunnanensis (pitard ex Diels) Cohen Stuart.The 5 species belong to different sections and subgenus.The results indicate that they are all diploid (2n=2x=30); but quite different in karyotypic constitution. In the light of Stebbins classification of karyotypic asymmetry, the karyotypes of C.grijsii and C.wenshanensis fall into "2A"type; while C.purpura, C.yunnanensis and C.euphelebia have "2B" karyotype.