权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Analysis on the character evolution in Australian Gnaphalieae based on molecular phylogenetic tree.

基于分子系统发育树的澳大利亚咬颌科性状进化分析

基本信息

批准号：
08640887
负责人：
WATANABE Kuniaki
金额：
$ 1.41万
依托单位：
KOBE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

Chromosome numbers from 112 populations of 75 species of 30 genera in Gnaphalieae and 8 populations of 6 species of 3 genera in Plucheeae were determined. Although the chromosome base number of Gnaphalieae outside of Australia is constant on x=7, the variable dysploidy series in Angianthus (n=13,12,6), Asteredia (n=9,7), Erymophyllum (n=14,11), Gnephosis (n=11,8), Hyaloserma (n=12,11,8), Lawrencella (n=11,8), Millotia (n=13,11,8), , Myriocephalus (n=14,11), Podolepes (n=12,11,10,8,7,3), Pogonolepis (n=6,5,4), Polycalymma (n=14,8), Pycnosorus (n=10,6), Rhodanthe (n=11,10,8,7,5) and Tricanthodium (n=4,3) were found in Australian semi-desert. To clarify the species relationship and the evolutionary trends in chromosome number habit and morphological characters, we have compared the nucleotide sequences of matK gene of chloroplast between species and constructed the molecular phylogenetic trees of Grapharieae. The matK tree supports the monophyly of the genus Podolepis, except P.kendallii which has onece classified in Herychrysum. The genus Podolepis is divided into 2 clusters corresponding to the difference of habits, perennial and annual. The dysploid reductions from n=12 to n=3, have occurred in two clades and these derived characters are regarded to be adaptive under the arid or seasonally dry conditions.

对天南星科30属75种112个居群和李亚科3属6个种8个居群的染色体数目进行了测定。在澳大利亚以外的荒漠地区，虽然Gnaphalieae的染色体碱基数目在x=7上保持不变，但在Angiantus(n=13，12，6)，Asterdia(n=9，7)，Erymophyllum(n=14，11)，Gnephsis(n=11，8)，Hyaloserma(n=12，11，8)，Lawrencella(n=11，8，8)，Millotia(n=13，11，8)，Myriocephalus(n=12，11，10，7，3)，Pogolonepis(n=6，5，4)，Polycalymma(n=14，8)，Pynosorus(n=6，6)，Rhodanthe(n=11，8，7，5)和Tanthodium(n=4，3)中发现了可变的异倍体系列。为了弄清物种间的亲缘关系以及染色体数目习性和形态特征上的进化趋势，我们比较了不同物种间叶绿体matK基因的核苷酸序列，构建了石墨亚科植物的分子系统发育树。MatK树支持Podolepis属的单系性，但Podolepis kendallii有1个分类于Herychrysum。Podolepis属根据习性的不同分为两类，多年生和一年生。在两个分支中发生了从n=12到n=3的非倍体退化，这些衍生特征被认为是适应干旱或季节性干旱条件的。