Lawrence Nevin C, Hauvermale Amber L, Dhingra Amit, Burke Ian C
Department of Crop and Soil Sciences Washington State University Pullman WA USA.
University of Nebraska-Lincoln Scottsbluff NE USA.
Ecol Evol. 2017 Sep 7;7(20):8316-8328. doi: 10.1002/ece3.3386. eCollection 2017 Oct.
L. is an invasive winter annual grass naturalized across the United States. Numerous studies have investigated population structure and genetics in the context of as an ecological invader of natural areas and rangeland. Despite the wealth of information regarding , previous studies have not focused on, or made comparisons to, as it persists in individual agroecosystems. The objectives of this study were to assess the genetic diversity and structure, the occurrence of generalist and specialist genotypes, and the influence of climate on distribution of sourced exclusively from within small grain production regions of the Pacific Northwest. Genetic diversity of sourced from agronomic fields was found to be similar to what has been observed from other land use histories. Six distinct genetic clusters of were identified, with no evidence to indicate that any of the genetic clusters were better adapted to a particular geographical area or climate within the region. Given the apparent random spatial distribution of genetic clusters at the spatial scale of this analysis, unique genotypes may be well mixed within region, similar to what was reported for other inbreeding weedy grass species.
L.是一种入侵性的冬季一年生草本植物，已在美国归化。许多研究在其作为自然区域和牧场的生态入侵者的背景下，对其种群结构和遗传学进行了调查。尽管有大量关于它的信息，但以前的研究并未关注它在单个农业生态系统中的持续存在情况，也未进行相关比较。本研究的目的是评估遗传多样性和结构、泛化和特化基因型的出现情况，以及气候对仅来自太平洋西北部小粒粮食生产区域内的L.分布的影响。发现来自农艺田的L.的遗传多样性与从其他土地利用历史中观察到的情况相似。确定了L.的六个不同遗传簇，没有证据表明任何一个遗传簇更适应该区域内的特定地理区域或气候。鉴于在此分析的空间尺度上L.遗传簇明显随机的空间分布，独特的基因型可能在区域内充分混合，这与其他自交杂草物种的报道情况类似。
