Gene flow among crops and their wild relatives is an active study area in evolutionary biology and agronomy, because genetic exchange between them may impact their evolutionary trajectories and increase the genetic variation of the cultivated lineages. Mexico is a center of diversity for the genus Cucurbita that includes pumpkins, squashes and gourds. Gene flow between domesticated and wild species has been reported as common in Cucurbita; but gene flow among populations of C. pepo ssp. pepo from Mexico and its wild relative has not been studied. We used 2,061 SNPs, derived from tGBS to estimate gene flow among 14 Mexican traditional landraces of C. pepo ssp. pepo, five commercial varieties of C. pepo ssp. pepo and C. pepo ssp. ovifera var. ovifera, and eight individuals of their wild relative C. pepo ssp. fraterna. Pairwise FST values show low to moderate genetic differentiation between the different taxonomic groups of C. pepo; furthermore, the counts of the "AABB" "ABBA" and "BABA" sites are very homogeneous for all the possible arrangements between the lineages, suggesting high levels of gene flow between these varieties or incomplete lineage sorting. Evidence of the use of landraces of Mexico as genetic material for the improvement of commercial varieties was found. The landraces of Mexico are an important source for genetic diversity for C. pepo, diversity that has been preserved both by management practices of small farmers, and by the natural gene flow that exists between the different crop fields of the region.

中文翻译：

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栽培西葫芦（C. pepo ssp。pepo）及其野生近缘种C. pepo ssp的最新和历史基因流。墨西哥的fraterna

作物及其野生近缘种之间的基因流动是进化生物学和农学领域的活跃研究领域，因为它们之间的遗传交换可能会影响其进化轨迹并增加栽培谱系的遗传变异。墨西哥是南瓜属的多样性中心，其中包括南瓜，南瓜和葫芦。据报道，在葫芦科中，驯养和野生物种之间的基因流动很普遍。但基因流之间的C. pepo ssp。墨西哥的pepo及其野生近缘种尚未进行过研究。我们使用了来自tGBS的2,061个SNP，以估计墨西哥C. pepo ssp的14个传统地方种之间的基因流。pepo，C。pepo ssp的五个商业变种。pepo和C. pepo ssp。卵子变种 卵和野生亲缘种C. pepo ssp的8个个体。fraterna。成对的FST值显示C. pepo的不同分类组之间的中低遗传分化。此外，对于谱系之间所有可能的排列，“ AABB”，“ ABBA”和“ BABA”位点的计数非常均一，表明这些品种之间的基因流水平较高或谱系分选不完整。发现了使用墨西哥的地方品种作为改良商业品种的遗传材料的证据。墨西哥的地方品种是梭菌的遗传多样性的重要来源，小农户的管理实践和该地区不同农作物之间存在的自然基因流动既保护了该物种的多样性。对于谱系之间所有可能的排列，“ AABB”，“ ABBA”和“ BABA”位点的计数非常均一，表明这些品种之间的基因流水平较高或谱系分选不完整。发现了使用墨西哥的地方品种作为改良商业品种的遗传材料的证据。墨西哥的地方品种是梭菌的遗传多样性的重要来源，小农户的管理实践和该地区不同农作物之间存在的自然基因流既保护了该物种的多样性。对于谱系之间所有可能的排列，“ AABB”，“ ABBA”和“ BABA”位点的计数非常均一，表明这些品种之间的基因流水平较高或谱系分选不完整。发现了使用墨西哥的地方品种作为遗传物质改良商业品种的证据。墨西哥的地方品种是梭菌的遗传多样性的重要来源，小农户的管理实践和该地区不同农作物之间存在的自然基因流既保护了该物种的多样性。发现了使用墨西哥的地方品种作为遗传物质改良商业品种的证据。墨西哥的地方品种是梭菌的遗传多样性的重要来源，小农户的管理实践和该地区不同农作物之间存在的自然基因流既保护了该物种的多样性。发现了使用墨西哥的地方品种作为遗传物质改良商业品种的证据。墨西哥的地方品种是梭菌的遗传多样性的重要来源，小农户的管理实践和该地区不同农作物之间存在的自然基因流既保护了该物种的多样性。