Genome of the parasitoid wasp<i>Dinocampus coccinellae</i>reveals extensive duplications, accelerated evolution, and independent origins of thelytokous parthenogeny and solitary behavior

Sethuraman, Arun; Tovar, Alicia; Welch, Walker; Dettmers, Ryan; Arce, Camila; Skaggs, Timothy; Rothenberg, Alexander D.; Saisho, Roxane; Summerhays, Bryce; Cartmill, Ryan; Grenier, Christy; Vasquez, Yumary; Vansant, Hannah; Obrycki, John J.

doi:10.1093/g3journal/jkac001

Cited by 9 publications

(1 citation statement)

References 46 publications

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“…It is generally believed that thelytoky evolved from arrhenotoky in Hymenoptera ( Cook 1993 ; Adachi-Hagimori et al, 2011 ; Ma et al, 2014 ; Sethuraman et al, 2022 ). A recent study suggested two independent origins for thelytokous Dinocampus coccinellae from the ancestral arrhenotokous strain ( Sethuraman et al, 2022 ). However, in the process of evolution, thelytokous and arrhenotokous modes have reached different outcomes ( Smith and Maynard-Smith, 1978 ).…”

Section: Discussionmentioning

confidence: 99%

Apomixis for no bacteria-induced thelytoky in Diglyphus wani (Hymenoptera: Eulophidae)

et al. 2023

Front. Genet.

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In Hymenoptera species, the reproductive mode is usually arrhenotoky, where haploid males arise from unfertilized eggs and diploid females from fertilized eggs. In addition, a few species reproduce by thelytoky, where diploid females arise from unfertilized eggs. Diploid females can be derived through various cytological mechanisms in thelytokous Hymenoptera species. Hitherto, these mechanisms were revealed mainly in endosymbiont-induced thelytokous Hymenoptera species. In contrast, thelytokous Hymenoptera species in which a reproductive manipulator has not been verified or several common endosymbionts have been excluded were paid less attention in their cytological mechanisms, for instance, Diglyphus wani (Hymenoptera: Eulophidae). Here, we investigated the cytological mechanism of D. wani using cytological methods and genetic markers. Our observations indicated that the diploid karyotypes of two strains of D. wani consist of four pairs of relatively large metacentric chromosomes and one pair of short submetacentric chromosomes (2n = 10). The arrhenotokous strains could complete normal meiosis, whereas the thelytokous strain lacked meiosis and did not expulse any polar bodies. This reproductive type of lacking meiosis is classified as apomictic thelytoky. Moreover, a total of 636 microsatellite sequences were obtained from thelytokous D. wani, dominated by dinucleotide repeats. Genetic markers results showed all three generations of offspring from thelytokous strain maintained the same genotype as their parents. Our results revealed that D. wani is the first eulophid parasitoid wasp in Hymenoptera whose thelytoky was not induced by bacteria to form an apomictic thelytoky. These findings provide a baseline for future inner molecular genetic studies of ameiotic thelytoky.

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Section: Discussionmentioning

confidence: 99%

Apomixis for no bacteria-induced thelytoky in Diglyphus wani (Hymenoptera: Eulophidae)

et al. 2023

Front. Genet.

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The geographic scope of host use by the ladybeetle parasitoid Dinocampus coccinellae

et al. 2023

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Ladybird predators in natural and agricultural landscapes in Mexico: diversity and parasitism

Mendoza-Arroyo,

del-Val

2024

Arthropod-Plant Interactions

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Ladybirds (Coleoptera: Coccinellidae) are a significant predator group that plays a role in agricultural contexts. They serve as important biocontrol agents against several agricultural pests. However, there is limited information available about how ladybirds’ populations are regulated by their natural enemies and habitat perturbation. In this study, we evaluated ladybird communities associated with natural and managed areas during the agricultural cycle of 2018 (June–September). We identified seven ladybird species; the most abundant species were Hippodamia convergens (70% individuals) and Cycloneda sanguinea (20% individuals), followed by the exotic species Harmonia axyridis (3.33% individuals), while Paranaemia vittigera, Coleomegilla maculata, Brachiacantha sp., and Olla v-nigrum represented less than 3% each. Ladybirds were more abundant in agricultural fields than in natural habitats. We identified several natural enemies associated with the collected ladybirds, including parasitoids (Dinocampus coccinellae, Hymenoptera: Braconidae), ectoparasitic Acari (Coccipolipus sp., Podapolipidae), and nematodes (Mermithidae). However, none of the natural enemies affected more than 10% of the ladybirds, so natural enemies do not appear to be exerting substantial control over their populations. Our results corroborated that ladybirds can efficiently thrive in anthropogenic habitats in Mexico and therefore may represent good biocontrol agents for agriculture. It is important to consider the ecology of agriculturally important ladybirds in programs for integrated pest management. This includes factors contributing to the mortality of ladybirds, including their natural enemies.

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Genome of the parasitoid waspDinocampus coccinellaereveals extensive duplications, accelerated evolution, and independent origins of thelytokous parthenogeny and solitary behavior

Cited by 9 publications

References 46 publications

Apomixis for no bacteria-induced thelytoky in Diglyphus wani (Hymenoptera: Eulophidae)

Apomixis for no bacteria-induced thelytoky in Diglyphus wani (Hymenoptera: Eulophidae)

The geographic scope of host use by the ladybeetle parasitoid Dinocampus coccinellae

Ladybird predators in natural and agricultural landscapes in Mexico: diversity and parasitism

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