MULTIPLE ORIGINS AND GENETIC DIVERSITY IN THE NEWLY ARISEN ALLOPOLYPLOID SPECIES, SENECIO-CAMBRENSIS ROSSER (COMPOSITAE)
MULTIPLE ORIGINS AND GENETIC DIVERSITY IN THE NEWLY ARISEN ALLOPOLYPLOID SPECIES, SENECIO-CAMBRENSIS ROSSER (COMPOSITAE)
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DOI：
10.1038/hdy.1992.3
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发表时间：
1992-01-01
期刊：
影响因子：
3.8
通讯作者：
ABBOTT, RJ
中科院分区：
文献类型：
--
作者：
ASHTON, PA;ABBOTT, RJ
在英国已知cambrensis存在的三个地点，即威尔士的Wrexham和Mochdre以及苏格兰的爱丁堡，对新出现的异源多倍体Senecio cambrensis及其两个亲本种S. vulgaris和S. squalidus进行了等位酶变异调查。Acp-1位点和α - est -1位点的电泳变异为威尔士和爱丁堡的cambrensis分离起源提供了强有力的证据。Aat-3位点的变异模式表明，威尔士物种可能有另外两个独立的起源，尽管这种变异可以解释为同源染色体配对后从固定杂合子（代表单一起源）分离的结果，β - est -3位点记录的变异模式也是如此。没有发现任何一种酶系统是在其亲本中不存在的。cambrensis起源于不同地点，并在亲本基因组之间重组后产生遗传多样性的能力，可能有利于其在英国的建立和多样化。
A survey of allozyme variation was conducted in populations of the newly arisen allopolyploid species Senecio cambrensis and its two parental species S. vulgaris and S. squalidus sampled from the three locations in Britain where S. cambrensis is known to occur, i.e. at Wrexham and Mochdre in Wales, and Edinburgh in Scotland. Electrophoretic variation at the Acp-1 and alpha-Est-1 loci provided strong evidence of separate origins of S. cambrensis in Wales and Edinburgh. The possibility of two additional independent origins of the species in Wales was indicated by the variation pattern at the Aat-3 locus, although this variation could be explained as a result of segregation from a fixed heterozygote (representative of a single origin) following pairing between homoeologous chromosomes, as could the pattern of variation recorded at the beta-Est-3 locus. For no enzyme system were additional allozymes found in S. cambrensis which were not present in one of the respective parents. The ability of S. cambrensis to originate at different locations and to generate genetic diversity following recombination between its parental genomes, might act in favour of its establishment and diversification in Britain.