Bousquet J, Strauss S H, Doerksen A H, Price R A
Department of Forest Science, Oregon State University, Corvallis 97331-5705.
Proc Natl Acad Sci U S A. 1992 Aug 15;89(16):7844-8. doi: 10.1073/pnas.89.16.7844.
Extensive variation in synonymous and nonsynonymous rates of substitution was observed among 50 sequences of the gene coding for the large subunit of ribulose-1,5-bisphosphate carboxylase (rbcL) representing bryophyte, conifer, dicot, and monocot taxa. Relative rate tests revealed rate differences of up to 138% for nonsynonymous substitutions and up to 85% for synonymous ones. Within angiosperms, the annual forms evolved more rapidly, on average, than perennial forms. This rate heterogeneity was more extensive at nonsynonymous sites than synonymous ones, and it resulted primarily from a recent acceleration of substitution rate in many groups of angiosperms.
在代表苔藓植物、针叶树、双子叶植物和单子叶植物类群的50个编码1,5 - 二磷酸核酮糖羧化酶大亚基（rbcL）的基因序列中，观察到同义替换率和非同义替换率存在广泛差异。相对速率测试显示，非同义替换的速率差异高达138%，同义替换的速率差异高达85%。在被子植物中，一年生植物形式平均比多年生植物形式进化得更快。这种速率异质性在非同义位点比同义位点更广泛，并且主要是由许多被子植物类群最近替换速率的加速导致的。
