葱属Amerallium亚属(石蒜科)的系统发生与性状进化(英文)  

Phylogeny and Character Evolution in Allium Subgenus Amerallium (Amaryllidaceae)

作　　者：李琴琴[1] 周颂东[1] 何兴金[1] 魏先芹[1] 

机构地区：[1]四川大学生命科学学院,四川成都610064

出　　处：《植物分类与资源学报》2012年第2期107-119,共13页Plant Diversity

基　　金：国家自然科学基金资助项目(31070166,31100161);教育部博士点基金资助项目(20090181110064);中国科学院大科学装置开放研究项目(2009-LSF-GBOWS-01)资助;科技部科技基础性工作专项重点项目(2007FY110100)

摘　　要：运用贝叶斯和简约法对葱属(Allium)Amerallium亚属的核糖体DNA内转录间隔区(ITS)进行了分析,对该亚属的系统发生进行了推测。系统分析证实Amerallium是单系的,并表明该亚属由三个隔离的地理群组成:北美Ameralliums,地中海区Ameralliums和东亚Ameralliums。性状进化的重建表明鳞茎是原始或祖先状态,根状茎和肉质增粗的根是衍生状态且在Amerallium这个亚属的类群中独立进化发生了几次。重建也表明该亚属的原始染色体基数x=7,其它染色体基数(x=8,9,10,11)是由它转化而来的。在北美类群中,异基数性相当罕见,而多倍性似乎是一个相对频繁的进化事件。在地中海区类群和东亚类群中,异基数性和多倍性是染色体进化的两个主要驱动力。Bayesian and parsimony analyses of the nuclear ribosomal DNA internal transcribed spacer （ITS） were used to infer the phylogeny of Allium subgenus Amerallium. Phylogenetic analyses corroborate that Amerallium is monophyletic and the results indicate that Amerallium composed of three isolated geographical groups： North American Ameralliums, the Mediterranean region Ameralliums, and eastern Asian Ameralliums. Reconstruction of character evolution suggests bulbs as a primitive or ancestral state, and rhizomes and thick fleshy roots as derived states which have evolved and developed several times independently within the groups of Amerallium, and the basic chromosome number x=7 is the primitive state and other basic chromosomes numbers （x=8, 9, 10, 11） are derived from x=7. Within North American Ameralliums, dysploidy is a rather rare evolutionary event and polyploidy seems to be a relatively frequent evolutionary event. Within the Mediterranean region and eastern Asian Ameralliums, both dysploidy and polyploidy are two primary driving forces in their chromosome evolution.

关 键 词：葱属 Amerallium 性状进化 ITS 系统发生 

分 类 号：Q941[生物学—植物学]