EVOLUTIONARY IMPLICATIONS OF MAT K INDELS IN POACEAE 1
EVOLUTIONARY IMPLICATIONS OF MAT K INDELS IN POACEAE 1
复制标题
禾本科 1 中 MAT K INDELS 的进化意义
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
Alice.
中科院分区：
文献类型：
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作者：
Khidir;W.;Hilu;Lawrence;A.;Alice.
插入/缺失事件（indels）和叶绿体基因matK的极端39端的核苷酸取代已被确定为区分某些主要的禾本科植物谱系。一个1 bp（碱基对）的缺失造成开放阅读框（ORF）的移位和一个点突变支持链毛类和Anomorphia作为禾本科中两个最基本的谱系的位置。另一个导致ORF提前终止的1-bp缺失是Ehrharta所特有的，它是分类学上有争议的部落Ehrharteae的成员。一个6-bp的插入支持单系亚科黍亚科，野竹亚科，Centothecoideae，和Chloridoideae（PACC）。这个标记似乎在定义PACC分支成员有用，并可能提供洞察PACC和其他谱系之间的姐妹群关系的潜力。与裸子植物、被子植物和苔藓植物的氨基酸序列比对表明，该区域相对保守，但在禾本科中变异明显较高。这些变化在禾本科和其他植物科的进化意义。
Insertion/deletion events (indels) and nucleotide substitutions at the extreme 39 end of the chloroplast gene matK have been identified that distinguish certain major lineages of grasses. A 1-bp (base pair) deletion creating a shift in the open reading frame (ORF) and a point mutation support the positions of Streptochaeta and Anomochloa as the two most basal lineages in Poaceae. Another 1-bp deletion resulting in early termination of the ORF is unique to Ehrharta, a member of the taxonomically disputable tribe Ehrharteae. A 6-bp insertion supports monophyly of subfamilies Panicoideae, Arundinoideae, Centothecoideae, and Chloridoideae (PACC). This marker appears useful in defining PACC clade members and may have potential in providing insight into the sister-group relationship between PACC and other lineages. Alignment of deduced amino acid sequences from bryophytes, gymnosperms, and angiosperms shows that this region is relatively conserved, but variation is notably higher in Poaceae. The evolutionary implications of these changes in grasses and other plant families are addressed.