Taxonomic studies on a collection of Chalcidoidea (Hymenoptera) from India with new distribution records

Gupta, Ankita; Poorani, J.

doi:10.11609/jott.o1861.300-4

Cited by 9 publications

(5 citation statements)

References 15 publications

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“…invasa reproduces by thelytokous parthenogenesis. In contrast, a high frequency of males has been recorded in populations from China (males ranging from 18–48% in some populations) [ 17 , 26 ] and in populations from South–East Asia (Taiwan, India, Thailand) [ 22 , 23 , 24 , 25 ]. Interestingly, the genetic differentiation within L .…”

Section: Discussionmentioning

confidence: 99%

“…The eucalyptus gall wasp was originally described as a thelytokous species [ 3 ], as field populations were represented only by females. Afterwards, males were recorded and described in some populations from Turkey [ 21 ], India [ 22 ], China [ 23 ], Thailand [ 24 ] and Taiwan [ 25 ] with a sex ratio ranging from 0.5% males in Turkish populations [ 21 ] up to 18–48% in Chinese populations [ 26 ]. Female-biased sex ratio occurs frequently in Hymenoptera [ 27 ] and, in chalcidoid lineages especially, it has been associated with infection of symbiotic intracellular bacteria able to manipulate their host’s reproduction by inducing male-killing (mortality of infected male embryos), feminization (genotypic diploid males develop as functional phenotypic females from unfertilized eggs) or more commonly thelytokous parthenogenesis (mothers produce only diploid daughters from unfertilized haploid eggs) [ 28 – 32 ].…”

Section: Introductionmentioning

confidence: 99%

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Genetic Diversity of the Invasive Gall Wasp Leptocybe invasa (Hymenoptera: Eulophidae) and of its Rickettsia Endosymbiont, and Associated Sex-Ratio Differences

et al. 2015

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The blue-gum chalcid Leptocybe invasa Fisher & LaSalle (Hymenoptera: Eulophidae) is a gall wasp pest of Eucalyptus species, likely native to Australia. Over the past 15 years it has invaded 39 countries on all continents where eucalypts are grown. The worldwide invasion of the blue gum chalcid was attributed to a single thelytokous morphospecies formally described in 2004. Subsequently, however, males have been recorded in several countries and the sex ratio of field populations has been found to be highly variable in different areas. In order to find an explanation for such sex ratio differences, populations of L. invasa from a broad geographical area were screened for the symbionts currently known as reproductive manipulators, and both wasps and symbionts were genetically characterized using multiple genes. Molecular analyses suggested that L. invasa is in fact a complex of two cryptic species involved in the rapid and efficient spread of the wasp, the first recovered from the Mediterranean region and South America, the latter from China. All screened specimens were infected by endosymbiotic bacteria belonging to the genus Rickettsia. Two closely related Rickettsia strains were found, each infecting one of the two putative cryptic species of L. invasa and associated with different average sex ratios. Rickettsia were found to be localized in the female reproductive tissues and transovarially transmitted, suggesting a possible role of Rickettsia as the causal agent of thelytokous parthenogenesis in L. invasa. Implications for the variation of sex ratio and for the management of L. invasa are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Genetic Diversity of the Invasive Gall Wasp Leptocybe invasa (Hymenoptera: Eulophidae) and of its Rickettsia Endosymbiont, and Associated Sex-Ratio Differences

et al. 2015

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“…This may be due to the small number of shoots held in the laboratory or the low prevalence or absence of natural enemies at the site. In India, Gupta and Poorani (2009) (Viggiani et al, 2000;Protasov et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

Rapid survey of damage due to gall wasp infestation in a coppiced <i>Eucalyptus camaldulensis</i> plantation in Maragamuwa, Naula in the Matale district of Sri Lanka

Karunaratne

Edirisinghe

Ranawana

2011

Ceylon J. Sci. (Biol. Sci.)

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According to several sources, Eucalyptus plantations in Sri Lanka are currently under threat due to an attack by a gall wasp. Our observations made at a coppiced Eucalyptus camaldulensis plantation at Maragamuwa, Naula in the Matale District revealed a heavy infestation of galls in coppiced shoots. Close examination of 40 trees in a block revealed low damage in 62.5% of the coppiced trees and heavy damage in 10% of the trees. The wasps that emerged from field collected galls were identified as Leptocybe invasa Fisher & La Salle (Hymenoptera: Eulophidae). Only female wasps emerged from the field collected galls and no parasitoids were recorded. This preliminary study highlights the severity of damage caused by L. invasa and the need to identify appropriate measures to manage this invasive gall wasp of Eucalyptus plantations in the country.

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“…In recent years, L . invasa males have been reported in Turkey (male/female ratio: 1:124) [ 13 ], India [ 14 ], China (male/female ratio: 1:126& 1:125) [ 15 ], Taiwan [ 16 ], Thailand [ 17 ] and other places successively. Liang Yiping’s study found that the proportion of male L .…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity analysis of the invasive gall pest Leptocybe invasa (Hymenoptera: Apodemidae) from China

et al. 2021

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Leptocybe invasa Fisher et LaSalle is a global invasive pest that seriously damages Eucalyptus plants. Studying the genetic diversity, genetic structure and introgression hybridization of L. invasa in China is of great significance for clarifying the breeding strategy, future invasion and diffusion trends of L. invasa in China and developing scientific prevention and control measures. Genetic diversity and phylogenetic analyses of 320 L. invasa female adults from 14 geographic populations in China were conducted using 10 polymorphic microsatellite loci (SSRs) and mitochondrial DNA cytochrome oxidase I gene sequences (COIs). (1) The Bayesian phylogenetic tree and haplotype network diagram showed that only haplotype Hap3 existed in L. invasa lineage B in China, while haplotypes Hap1 and Hap2 existed in lineage A, among which haplotype Hap2 was found for the first time. The nucleotide and haplotype diversities of lineage A were higher than those of lineage B. (2) The SSR genetic diversity of the Wuzhou Guangxi, Ganzhou Jiangxi and Panzhihua Sichuan populations was higher than that of the other 11 populations, and the SSR genetic diversity of lineage A was higher than that of lineage B. (3) The AMOVA analysis of mitochondrial COI data showed that 75.55% of the variation was among populations, and 99.86% of the variation was between lineages, while the AMOVA analysis of nuclear SSR data showed that 35.26% of the variation was among populations, and 47.04% of the variation was between lineages. There were obvious differences in the sources of variation between the COI and SSR data. (4) The optimal K value of COI and SSR data in structure analysis was 2, and PCoA analysis also divided the dataset into two obvious categories. The UPMGA phylogenetic tree based on SSR data clustered 14 geographic species into two groups. The results of genetic structure analysis supported the existence of two lineages, A and B, in China. (5) Structural analysis showed that there was obvious introgressive hybridization in Wuzhou Guangxi, Ganzhou Jiangxi, Panzhihua Sichuan and other populations. These results suggest that lineage introgressive hybridization has occurred in the L. invasa population in China. The introgressive hybridization degree and genetic diversity of lineage A are obviously higher than those of lineage B. Lineage introgressive hybridization may be the driving force for further L. invasa invasion and diffusion in China in the future.

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Taxonomic studies on a collection of Chalcidoidea (Hymenoptera) from India with new distribution records

Cited by 9 publications

References 15 publications

Genetic Diversity of the Invasive Gall Wasp Leptocybe invasa (Hymenoptera: Eulophidae) and of its Rickettsia Endosymbiont, and Associated Sex-Ratio Differences

Genetic Diversity of the Invasive Gall Wasp Leptocybe invasa (Hymenoptera: Eulophidae) and of its Rickettsia Endosymbiont, and Associated Sex-Ratio Differences

Rapid survey of damage due to gall wasp infestation in a coppiced <i>Eucalyptus camaldulensis</i> plantation in Maragamuwa, Naula in the Matale district of Sri Lanka

Genetic diversity analysis of the invasive gall pest Leptocybe invasa (Hymenoptera: Apodemidae) from China

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