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杂草性作物-野生杂交甜菜种群在交配系统和种群遗传结构方面表现出截然不同的变异。

Populations of weedy crop-wild hybrid beets show contrasting variation in mating system and population genetic structure.

作者信息

Arnaud Jean-François, Fénart Stéphane, Cordellier Mathilde, Cuguen Joël

机构信息

Laboratoire de Génétique et Évolution des Populations Végétales, UMR CNRS 8016, Bâtiment SN2, Université des Sciences et Technologies de Lille - Lille 1 Villeneuve d'Ascq Cedex, France.

出版信息

Evol Appl. 2010 May;3(3):305-18. doi: 10.1111/j.1752-4571.2010.00121.x. Epub 2010 Feb 18.

DOI:10.1111/j.1752-4571.2010.00121.x
PMID:25567926
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3352460/
Abstract

Reproductive traits are key parameters for the evolution of invasiveness in weedy crop-wild hybrids. In Beta vulgaris, cultivated beets hybridize with their wild relatives in the seed production areas, giving rise to crop-wild hybrid weed beets. We investigated the genetic structure, the variation in first-year flowering and the variation in mating system among weed beet populations occurring within sugar beet production fields. No spatial genetic structure was found for first-year populations composed of F1 crop-wild hybrid beets. In contrast, populations composed of backcrossed weed beets emerging from the seed bank showed a strong isolation-by-distance pattern. Whereas gametophytic self-incompatibility prevents selfing in wild beet populations, all studied weed beet populations had a mixed-mating system, plausibly because of the introgression of the crop-derived Sf gene that disrupts self-incompatibility. No significant relationship between outcrossing rate and local weed beet density was found, suggesting no trends for a shift in the mating system because of environmental effects. We further reveal that increased invasiveness of weed beets may stem from positive selection on first-year flowering induction depending on the B gene inherited from the wild. Finally, we discuss the practical and applied consequences of our findings for crop-weed management.

摘要

生殖性状是杂草型作物-野生杂种入侵性进化的关键参数。在甜菜中，栽培甜菜在种子生产区与其野生近缘种杂交，产生了作物-野生杂种杂草甜菜。我们调查了甜菜生产田内杂草甜菜种群的遗传结构、第一年开花的变异以及交配系统的变异。由F1作物-野生杂种甜菜组成的第一年种群未发现空间遗传结构。相比之下，从种子库中出现的回交杂草甜菜种群呈现出强烈的距离隔离模式。虽然配子体自交不亲和性阻止了野生甜菜种群的自交，但所有研究的杂草甜菜种群都具有混合交配系统，这可能是由于作物来源的Sf基因渗入破坏了自交不亲和性。未发现异交率与当地杂草甜菜密度之间存在显著关系，这表明交配系统没有因环境影响而发生变化的趋势。我们进一步揭示，杂草甜菜入侵性的增加可能源于对第一年开花诱导的正向选择，这取决于从野生种继承的B基因。最后，我们讨论了我们的研究结果对作物-杂草管理的实际和应用后果。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9572/3352460/78dfbda805df/eva0003-0305-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9572/3352460/8fa2df81972b/eva0003-0305-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9572/3352460/1552328be082/eva0003-0305-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9572/3352460/78dfbda805df/eva0003-0305-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9572/3352460/8fa2df81972b/eva0003-0305-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9572/3352460/1552328be082/eva0003-0305-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9572/3352460/78dfbda805df/eva0003-0305-f3.jpg

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