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The genome sequence of the grape phylloxera provides insights into the evolution, adaptation, and invasion routes of an iconic pest.

Abstract：

BACKGROUND:Although native to North America, the invasion of the aphid-like grape phylloxera Daktulosphaira vitifoliae across the globe altered the course of grape cultivation. For the past 150 years, viticulture relied on grafting-resistant North American Vitis species as rootstocks, thereby limiting genetic stocks tolerant to other stressors such as pathogens and climate change. Limited understanding of the insect genetics resulted in successive outbreaks across the globe when rootstocks failed. Here we report the 294-Mb genome of D. vitifoliae as a basic tool to understand host plant manipulation, nutritional endosymbiosis, and enhance global viticulture. RESULTS:Using a combination of genome, RNA, and population resequencing, we found grape phylloxera showed high duplication rates since its common ancestor with aphids, but similarity in most metabolic genes, despite lacking obligate nutritional symbioses and feeding from parenchyma. Similarly, no enrichment occurred in development genes in relation to viviparity. However, phylloxera evolved > 2700 unique genes that resemble putative effectors and are active during feeding. Population sequencing revealed the global invasion began from the upper Mississippi River in North America, spread to Europe and from there to the rest of the world. CONCLUSIONS:The grape phylloxera genome reveals genetic architecture relative to the evolution of nutritional endosymbiosis, viviparity, and herbivory. The extraordinary expansion in effector genes also suggests novel adaptations to plant feeding and how insects induce complex plant phenotypes, for instance galls. Finally, our understanding of the origin of this invasive species and its genome provide genetics resources to alleviate rootstock bottlenecks restricting the advancement of viticulture.

journal_name

BMC Biol

journal_title

BMC biology

authors

Rispe C,Legeai F,Nabity PD,Fernández R,Arora AK,Baa-Puyoulet P,Banfill CR,Bao L,Barberà M,Bouallègue M,Bretaudeau A,Brisson JA,Calevro F,Capy P,Catrice O,Chertemps T,Couture C,Delière L,Douglas AE,Dufault-Thompson K

doi

10.1186/s12915-020-00820-5

subject

Has Abstract

pub_date

2020-07-23 00:00:00

pages

issue

issn

1741-7007

pii

10.1186/s12915-020-00820-5

journal_volume

pub_type

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The genome sequence of the grape phylloxera provides insights into the evolution, adaptation, and invasion routes of an iconic pest.