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首页> 外文期刊>Genetic Resources and Crop Evolution >Processes affecting genetic structure and conservation: a case study of wild and cultivated Brassica rapa
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Processes affecting genetic structure and conservation: a case study of wild and cultivated Brassica rapa

机译：影响遗传结构和保护的过程：以野生和栽培的芸苔属植物为例

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摘要

When planning optimal conservation strategies for wild and cultivated types of a plant species, a number of influencing biological and environmental factors should be considered from the outset. In the present study Brassica rapa was used to illustrate this: to develop Scandinavian conservation strategies for wild and cultivated B. rapa, DNA-marker analysis was performed on 15 cultivated and 17 wild accessions of B. rapa plus 8 accessions of the cross compatible B. napus. The B. rapa cultivars were bred in Sweden and Finland in 1944–1997 and the wild B. rapa material was collected from Denmark, Sweden and United Kingdom. The B. napus accessions were bred within the last 20 years in the Scandinavian countries. Results were based on scoring of 131 polymorphic ISSR markers in the total plant material. A Bayesian Markov chain Monte Carlo (MCMC) approach implemented in NewHybrids demonstrated a clear distinction of B. rapa and B. napus individuals except for three individuals that seemed to be backcrosses. The backcrossed hybrids descended from two Swedish populations, one wild and one escaped. The overall pattern of genetic variation and structure in B. rapa showed that cultivated and wild B. rapa accessions formed two almost separated clusters. Geographical origin and breeding history of cultivars were reflected in these genetic relationships. In addition, wild populations from Denmark and Sweden seemed to be closely related, except for a Swedish population, which seemingly was an escaped cultivar. The study point to that many processes, e.g. spontaneous introgression, naturalisation, breeding and agricultural practise affected the genetic structure of wild and cultivated B. rapa populations.
机译：在为野生和栽培植物物种规划最佳保护策略时，应从一开始就考虑许多影响生物和环境的因素。在本研究中，使用芸苔属来说明这一点：为了制定斯堪的纳维亚野生和栽培双歧杆菌的保护策略，对15种栽培双歧杆菌和17种野生双歧杆菌以及8种交叉兼容的双歧杆菌进行了DNA标记分析。那不勒斯。 1944年至1997年在瑞典和芬兰育出了B. rapa品种，并从丹麦，瑞典和英国收集了野生的B. rapa材料。 B. napus的种系在最近的20年间在斯堪的纳维亚国家繁殖。结果基于总植物材料中131个多态性ISSR标记的得分。在NewHybrids中实施的贝叶斯马尔可夫链蒙特卡罗（MCMC）方法证明了B. rapa和B. napus个体的明显区别，除了三个似乎是回交的个体。回交的杂种来自两个瑞典种群，其中一个野生，一个逃脱。 B. rapa遗传变异和结构的总体模式显示，栽培和野生B. rapa品种形成两个几乎分开的簇。这些遗传关系反映了品种的地理起源和繁殖历史。此外，丹麦和瑞典的野生种群似乎密切相关，除了瑞典种群外，瑞典种群似乎是一个逃脱的品种。研究指向许多过程，例如自发渗入，归化，育种和农业实践影响了野生和栽培B. rapa种群的遗传结构。

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