THE LIMITS OF AMINO-ACID SEQUENCE DATA IN ANGIOSPERM PHYLOGENETIC RECONSTRUCTION
THE LIMITS OF AMINO-ACID SEQUENCE DATA IN ANGIOSPERM PHYLOGENETIC RECONSTRUCTION
复制标题
DOI：
10.2307/2408870
复制
发表时间：
1988-07-01
期刊：
影响因子：
3.3
通讯作者：
BREMER, K
中科院分区：
文献类型：
--
作者：
BREMER, K
许多被子植物科的核酮糖二磷酸羧化酶、质体蓝素、细胞色素 c 和铁氧红毒素的氨基酸序列数据均可用。数据的分支分析，包括对所有同等或几乎同等简约的分支图的评估，表明存在大量同质性（平行性和逆转），并且很少或没有得到良好支持的单系群。在对 9 个被子植物家族和来自 3 个蛋白质的 40 个可变氨基酸位置的一项分析中，最简约的分支图有 151 个步骤长，包含 63 个平行和反转（一致性指数 = 0.583）。在对 4 个蛋白质的 6 个家族和 53 个可变氨基酸位置的另一项分析中，最简洁的分支图长 161 个步骤，包含 50 个平行和反转（一致性指数 = 0.689）。两个数据矩阵中的单一变化可以产生最简洁的分支图，其具有完全不同的拓扑结构并且没有共同的单系群。目前，氨基酸序列数据对于被子植物的系统发育重建来说还不够全面。需要更多信息丰富的位置，无论是对蛋白质的较长部分进行测序，还是对同一分类单元的更多蛋白质进行测序。
Amino acid sequence data are available for ribulose biphosphate carboxylase, plastocyanin, cytochrome c, and ferredotoxin for a number of angiosperm families. Cladistic analysis of the data, including evaluation of all equally or almost equally parsimonious cladograms, shows that much homoplasy (parallelisms and reversals) is present and that few or no well supported monophyletic groups of families can be demonstrated. In one analysis of nine angiosperm families and 40 variable amino acid positions from three proteins, the most parsimonious cladograms were 151 steps long and contained 63 parallelisms and reversals (consistency index=0.583). In another analysis of six families and 53 variable amino acid positions from four proteins, the most parsimonious cladogram was 161 steps long and contained 50 parallelisms and reversals (consistency index=0.689). Single changes in both data matrices could yield most parsimonious cladograms with quite different topologies and without common monophyletic groups. Presently, amino acid sequence data are not comprehensive enough for phylogenetic reconstruction among angiosperms. More informative positions are needed, either from sequencing longer parts of the proteins or from sequencing more proteins from the same taxa.