Moraes Tamara, Santos Larissa Muniz Amaral, Schwertner Cristiano Feldens, Corrêa Alberto Soares
Department of Entomology and Acarology, University of São Paulo, "Luiz de Queiroz" College of Agriculture (ESALQ/USP), Piracicaba, São Paulo, Brazil.
Museum of Zoology, University of São Paulo, São Paulo, São Paulo, Brazil.
J Econ Entomol. 2023 Dec 11;116(6):2173-2183. doi: 10.1093/jee/toad186.
Piezodorus guildinii (Westwood, 1837) (Hemiptera: Pentatomidae) is an important arthropod pest of soybean (Glycine max (L.) Merr.) throughout American continents. However, the historical events associated with its dispersion are poorly understood. In this study, we employed a phylogeographic approach to investigate the origin and demographic history of P. guildinii in Brazil. We analyzed the cytochrome c oxidase subunit I and Cytb gene sequences of P. guildinii individuals collected in Brazil's 5 soybean production macro-regions and cross-referenced this information with sequences available in public databases. Our findings support an older Caribbean basin establishment for the current genealogical strains of P. guildinii, with subsequent dispersion to Brazil around 0.97 Mya. No secondary dispersion of this species from the Caribbean region to soybean areas in Brazil was identified. The Brazilian populations of P. guildinii are genetically structured across the country's soybean macro-regions and show strong signals of continuous demographic and spatial expansion in Brazil, which may be accelerated by the soybean cropping landscape in the country. The populations from the northern region (MR5) are older than the Central and South populations. The signs of demographic expansion indicate that P. guildinii populations are increasing their effective size in soybean regions, which could reflect its importance as a soybean pest in the coming years.
黑角蝽（Piezodorus guildinii (Westwood, 1837)）（半翅目：蝽科）是美洲大陆大豆（Glycine max (L.) Merr.）的一种重要节肢动物害虫。然而，与其扩散相关的历史事件却鲜为人知。在本研究中，我们采用系统地理学方法来探究巴西黑角蝽的起源和种群历史。我们分析了在巴西5个大豆生产大区采集的黑角蝽个体的细胞色素c氧化酶亚基I和细胞色素b基因序列，并将这些信息与公共数据库中可用的序列进行交叉比对。我们的研究结果支持了当前黑角蝽谱系菌株在加勒比海盆地更早的建立，随后在约97万年前扩散到巴西。未发现该物种从加勒比地区向巴西大豆种植区的二次扩散。巴西的黑角蝽种群在该国大豆各大区存在遗传结构差异，并且在巴西呈现出持续的种群和空间扩张的强烈信号，这可能因该国的大豆种植格局而加速。北部地区（MR5）的种群比中部和南部的种群更为古老。种群扩张的迹象表明，黑角蝽种群在大豆种植区的有效规模正在增加，这可能反映出其在未来几年作为大豆害虫的重要性。
