Genetics of lineage diversification and the evolution of host usage in the economically important wheat curl mite, Aceria tosichella Keifer, 1969

BMC Evolutionary Biology

Maria Judite Alves¹  Mariusz Lewandowski²  Agnieszka Majer³  Wiktoria Szydo⁴  Lus Filipe Lopes⁵  Anna Skoracka⁶  Adam Miller⁷ 

[1] Deakin University, Geelong, Australia;Department of Applied Entomology, Faculty of Horticulture, Biotechnology and Landscape Architecture, Warsaw University of Life SciencesSGGW, Warsaw, Poland;Department of Botany, Faculty of Agriculture and Biology, Warsaw University of Life SciencesSGGW, Warsaw, Poland;Department of Entomology, University of Nebraska-Lincoln, Lincoln, USA;Museu Nacional de Histria Natural e da Cincia & Centre for Ecology, Evolution and Environmental Changes (cE3c), University of Lisbon, Lisbon, Portugal;Population Ecology Lab, Faculty of Biology, Adam Mickiewicz University, Pozna, Pozna, Poland;School of Life and Environmental Sciences, Centre for Integrative Ecology, Warrnambool, Australia

关键词: Aceria tosichella;    Demographic history;    Genetic diversity;    Host-associations;    Lineage diversification;    Species delimitation;   

DOI  :  10.1186/s12862-018-1234-x

学科分类：生物科学（综合）

来源: BioMed Central

【 摘 要 】

Understanding the mechanisms that underlie the diversification of herbivores through interactions with their hosts is important for their diversity assessment and identification of expansion events, particularly in a human-altered world where evolutionary processes can be exacerbated. We studied patterns of host usage and genetic structure in the wheat curl mite complex (WCM), Aceria tosichella, a major pest of the world’s grain industry, to identify the factors behind its extensive diversification. We expanded on previous phylogenetic research, demonstrating deep lineage diversification within the taxon, a complex of distinctive host specialist and generalist lineages more diverse than previously assumed. Time-calibrated phylogenetic reconstruction inferred from mitochondrial DNA sequence data suggests that lineage diversification pre-dates the influence of agricultural practices, and lineages started to radiate in the mid Miocene when major radiations of C4 grasses is known to have occurred. Furthermore, we demonstrated that host specificity is not phylogenetically constrained, while host generalization appears to be a more derived trait coinciding with the expansion of the world’s grasslands. Demographic history of specialist lineages have been more stable when compared to generalists, and their expansion pre-dated all generalist lineages. The lack of host-associated genetic structure of generalists indicates gene flow between mite populations from different hosts. Our analyses demonstrated that WCM is an unexpectedly diverse complex of genetic lineages and its differentiation is likely associated with the time of diversification and expansion of its hosts. Signatures of demographic histories and expansion of generalists are consistent with the observed proliferation of the globally most common lineages. The apparent lack of constrains on host use, coupled with a high colonization potential, hinders mite management, which may be further compromised by host range expansion. This study provides a significant contribution to the growing literature on host-association and diversification in herbivorous invertebrates.

【 授权许可】

CC BY