英语翻译Abstract:DNA C-value is a highly variable aspect of plant biodiversity whose origin and significance has often attracted general interest.Evaluation of the phylogenetic component of genome size variation is essential for a full explanatio

英语翻译Abstract:DNA C-value is a highly variable aspect of plant biodiversity whose origin and significance has often attracted general interest.Evaluation of the phylogenetic component of genome size variation is essential for a full explanatio
英语翻译
Abstract:DNA C-value is a highly variable aspect of plant biodiversity whose origin and significance has often attracted general interest.Evaluation of the phylogenetic component of genome size variation is essential for a full explanation of its evolutionary significance but was previously prevented by insufficient data and lack of phylogenetic consensus.However,the recent development for the angiosperms of a DNA C-values database for 2802 species and a robust phylogenetic tree based on a three-gene DNA sequence matrix and 252 non-molecular characters allows meaningful new investigations of genome size in a phylogenetic context.Superimposing data from the former onto the latter shows that whereas all 15 higher order groups for which data are available contain species with small C-values,very large C-values occur in only two distantly related groups.At the lower taxonomic levels within these two groups similar trends were detected,with very large C-values restricted to species in the more derived families.The most parsimonious explanation for these observations is that ancestral angiosperms almost certainly had small genomes,and the possession of very large genomes represents a derived condition that has arisen independently at least twice.In contrast,gymnosperms (sister group to the angiosperms) are characterized by larger C-values than angiosperms.Thus within extant seed plants the possession of a small genome is a character unique to the angiosperms that was not only present in the ancestral species but has also been retained in most living taxa.

英语翻译Abstract:DNA C-value is a highly variable aspect of plant biodiversity whose origin and significance has often attracted general interest.Evaluation of the phylogenetic component of genome size variation is essential for a full explanatio
摘要：DNA的C值是一个充满变数的方面植物多样性的起源和意义,往往引起人们普遍对此感兴趣.评价亲缘组成的基因组大小的变化是不可或缺的充分解释其进化意义,而且是先前阻止数据不足和缺乏亲缘共识.然而,最近的发展,为被子植物的一个DNA的C -价值观数据库为2802种和稳健的进化树的基础上,3个基因的DNA序列矩阵和252非分子特征允许有意义的新的调查的基因组大小在进化背景.叠加数据,由前到后显示,而所有15个高阶集团有数据可查包含物种只有少量的C -价值观,非常大的C -价值观发生在只有两个遥远相关团体.在较低层次的分类在这两个群体有类似的趋势已被侦破,并非常大的C -价值仅限于种越多,所得的家庭.最吝啬的解释,这些意见是被子植物的祖先几乎可以肯定了小基因组,并拥有相当大基因组代表了一种衍生的条件下,出现了独立于至少两次.相比之下,裸子植物（妹妹组到被子植物） ,其特点是较大的C -价值比被子植物.因此,在现存种子植物拥有一个小型的基因组是一个性格独特,向被子植物这不仅是目前在祖先种,而且还保留了大部分的生活类群.

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