Molecular phylogeny of Brachycome (Asteraceae)
Molecular phylogeny of Brachycome (Asteraceae)
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DOI：
10.1007/bf00984372
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发表时间：
1999-01-01
影响因子：
1.9
通讯作者：
Ito, M
中科院分区：
文献类型：
--
作者：
Denda, T;Watanabe, K;Ito, M
通过叶绿体基因matK的核苷酸序列比较，研究了短囊藻属的属内亲缘关系。基于matK树对部分形态学和细胞学性状的进化趋势进行了估计。结果表明，Brachycome被分为四个主要的分支，和界限的超级种主要基于果实形态是不完全支持。果实形态在几个谱系中平行地从简单结构进化到复杂结构。祖先的基本染色体数目是x = 9，并且较低的染色体数目是在四个主要分支的两个中从n = 9的几个异倍体减少的产物。
Intrageneric relationships in the genus Brachycome were investigated by the comparison of nucleotide sequences of the chloroplast gene matK. Evolutionary trends of some morphological and cytological characters were estimated based on the matK tree. The results indicate that Brachycome is divided into four major clades, and circumscription of superspecies based primarily on fruit morphology is not fully supported. Fruit morphology has evolved in parallel from simple to complex structures in several lineages. The ancestral basic chromosome number is x = 9, and lower chromosome numbers are the products of several dysploid reductions from n = 9 in two of four major clades of Brachycome.