scholarly journals Differences in the level of intraspecific genetic variability in taxons of aphids, differing by character of evolutionary dynamics

2017 ◽  
pp. 20-25
Author(s):  
M. M. Varabyova ◽  
N. V. Voronova
Keyword(s):  
Life Cycle ◽  
Genetic Variability ◽  
Host Plant ◽  
Host Plants ◽  
Evolutionary Dynamics ◽  
Wide Spectrum ◽  
Nucleotide Sequences ◽  
Coi Gene ◽  
Host Plant Specialization ◽  
High Level

Aim. Aphids are an interesting model to study the level of the genetic variability since there are species, which differ in the level of host-plant specialization and the peculiarity of a life cycle among them. The mutations observed in COI gene allow defining the interspecific level of the genetic variability in aphids. Methods. The highly conservative COI gene was used to study the level of the genetic variability in aphids. Results. The analysis of nucleotide sequences of COI gene allowed discovering statistically significant differences between generalists with wide spectrum of host plants, generalists with narrow spectrum of host plants and specialists. In addition, the genetic differences were discovered between holocyclic and angolocyclic species of aphids. Conclusions. As a result of the work it was determined that the wide spectrum of host-plants and holocycly are associated with the high level of genetic variability of COI gene in aphids.Keywords: aphids, genetic variability, COI, life cycle, host-plant specialization.

scholarly journals Evolutionary dynamics of specialization in herbivorous stick insects

2018 ◽  
Author(s):  
Larose Chloé ◽  
Rasmann Sergio ◽  
Schwander Tanja
Keyword(s):  
Host Plant ◽  
Species Interactions ◽  
Host Plants ◽  
Evolutionary Dynamics ◽  
Stick Insect ◽  
Insect Species ◽  
Herbivorous Insect ◽  
Host Plant Specialization ◽  
Feeding Niche ◽  
Feeding Experiments

AbstractUnderstanding the evolutionary dynamics underlying herbivorous insect mega-diversity requires investigating the ability of insects to shift and adapt to different host plants. Feeding experiments with nine related stick insect species revealed that insects retain the ability to use ancestral host plants after shifting to novel hosts, with host plant shifts generating fundamental feeding niche expansions. These expansions were not accompanied by expansions of the realized feeding niches however, as species on novel hosts are generally ecologically specialized. For shifts from angiosperm to chemically challenging conifer hosts, generalist fundamental feeding niches even evolved jointly with strong host plant specialization, indicating that host plant specialization is more likely driven by species interactions than by constraints imposed by plant chemistry. By coupling analyses of plant chemical compounds, fundamental and ecological feeding niches in multiple insect species, we provide novel insights into the evolutionary dynamics of host range expansion and contraction in herbivorous insects.

New rearing method, life cycle, tunneling behavior and ecological notes on the splendid ghost moth Aenetus djernaesae Simonsen, 2018 from Western Australia (Lepidoptera: Hepialidae)

2020 ◽  
Vol 15 (2) ◽  
pp. 26-39
Author(s):  
PAUL KAY ◽  
PAUL M HUTCHINSON ◽  
JOHN A GREHAN
Keyword(s):  
Life Cycle ◽  
Host Plant ◽  
Agaricus Bisporus ◽  
Host Plants ◽  
Adult Emergence ◽  
Rearing Method ◽  
First Instar ◽  
Early Instar ◽  
First Time ◽  
Tunneling Behavior

This study successfully documents, for the first time, the entire life cycle of Aenetus djernaesae Simonsen, 2018 and confirms the efficacy of using supplemental sources of fungi to feed the early instar larvae. Fresh cut pieces of the commercial mushroom Agaricus bisporus (J.E. Lange) and sections of Eucalyptus L’Her. bark were placed around the base of potted host plants –Myoporum insulare R.Br. (Scrophulariaceae) and the potential host plant Dodonea hackettiana W.Fitz. (Sapindaceae). First instar larvae were added to this matrix where they fed on the mushroom and bark. The life cycle comprised egg development of 20 days, fungal feeding of ~36 days, and host plant development (including pupal) of ~300 days. Adult emergence of reared and field collected samples occurred within a 22 day period. Larvae transferring from fungi to host plants transitioned during the night by constructing a web of silk and plant tissues within two hours and proceeding to excavate a tunnel from within. The mature larval tunnel is relatively short, up to 220 mm in length and usually extending below the entrance around which the larvae grazes on callus tissue forming after bark removal. Most adults emerged within an hour of dusk with the pupa protruding from the top of the vestibule. The rearing method described here demonstrates the feasibility of laboratory based studies of larval development in Aenetus Herrrich-Schäffer and other callus-feeding stem boring Hepialidae.  Key words: Hepialidae, Aenetus, life cycle, artificial diet, Myoporum, Dodonea, larval foodplant

scholarly journals Grassflies of genus Meromyza (Diptera, Chloropidae) and grasses: the evolution of host plant preference

2020 ◽  
Vol 18 (4) ◽  
pp. 433-444
Author(s):  
Andrey F. Safonkin ◽  
Svetlana V. Goryunova ◽  
Denis V. Goryunov ◽  
Tatiana A. Triseleva
Keyword(s):  
New Species ◽  
Phylogenetic Tree ◽  
Host Plant ◽  
Host Plants ◽  
Gene Locus ◽  
Wide Spectrum ◽  
Palaearctic Species ◽  
Ancestral Haplotypes ◽  
Western Palaearctic ◽  
Cereal Cultivars

The present and literature data showed that Meromyza flies developed on grasses from 5 tribes: Poeae, Triticeae, Bromeae, Nardeae, Arundinarieae. The preference of host plants for 25, mainly Western Palaearctic species of Meromyza flies was analyzed: 11 species developed on grasses of the tribe Poeae, 4 on Triticeae, 9 on grasses from different tribes, 1 species developed on bamboo. A phylogenetic tree based on the mtDNA CO1 gene locus was constructed in the BEAST for 28 species of Meromyza flies, for 8 species of Drosophila and Campiglossa pygmaea. The host plants were known for 19 species Meromyza flies out of 28 studied species. An overview of the evolution of grasses is given. By the possible time of the genus Meromyza origin (not earlier than the middle of the Miocene), based on the known evolutionary scale of Drosophila, the Pooideae grasses had already been isolated and division into tribes occured. The features of non-specialized phytophage-oligophage (except M. acuminata) confirmed by the wide spectrum of host plants have been supposed for species close to ancestral haplotypes (M. nigriseta, M. pratorum, M. saltatrix, M. variegata) or representing independent branches in their clusters (M. acuminata, M. mosquensis, M. nigriventris). The differentiation of Meromyza genus with formation of new species with narrow oligophagy or monophagy was associated with adaptation to other wild grasses following the formation and increase in the abundance of core pooids (Triticodae + Poodae) grasses and the spread of herbal biomes in the Miocene. Oligophages M. nigriventris, M. nigriseta, M. variegata and monophages M. acuminata, M. grandifemoris damage cereal cultivars.

scholarly journals Host Plants Influence the Symbiont Diversity of Eriosomatinae (Hemiptera: Aphididae)

Insects ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 217
Author(s):  
Ting-Ting Xu ◽  
Li-Yun Jiang ◽  
Jing Chen ◽  
Ge-Xia Qiao
Keyword(s):  
Host Plant ◽  
Host Plants ◽  
High Throughput Sequencing ◽  
Statistical Tests ◽  
Bacterial Flora ◽  
Multiple Infections ◽  
Primary Host ◽  
Host Plant Specialization ◽  
Taxonomic Distance ◽  
The Family

Eriosomatinae is a particular aphid group with typically heteroecious holocyclic life cycle, exhibiting strong primary host plant specialization and inducing galls on primary host plants. Aphids are frequently associated with bacterial symbionts, which can play fundamental roles in the ecology and evolution of their host aphids. However, the bacterial communities in Eriosomatinae are poorly known. In the present study, using high-throughput sequencing of the bacterial 16S ribosomal RNA gene, we surveyed the bacterial flora of eriosomatines and explored the associations between symbiont diversity and aphid relatedness, aphid host plant and geographical distribution. The microbiota of Eriosomatinae is dominated by the heritable primary endosymbiont Buchnera and several facultative symbionts. The primary endosymbiont Buchnera is expectedly the most abundant symbiont across all species. Six facultative symbionts were identified. Regiella was the most commonly identified facultative symbiont, and multiple infections of facultative symbionts were detected in the majority of the samples. Ordination analyses and statistical tests show that the symbiont community of aphids feeding on plants from the family Ulmaceae were distinguishable from aphids feeding on other host plants. Species in Eriosomatinae feeding on different plants are likely to carry different symbiont compositions. The symbiont distributions seem to be not related to taxonomic distance and geographical distance. Our findings suggest that host plants can affect symbiont maintenance, and will improve our understanding of the interactions between aphids, their symbionts and ecological conditions.

scholarly journals Phenotypic plasticity in chemical defence of butterflies allows usage of diverse host plants

2021 ◽  
Vol 17 (3) ◽  
Author(s):  
Érika C. P. de Castro ◽  
Jamie Musgrove ◽  
Søren Bak ◽  
W. Owen McMillan ◽  
Chris D. Jiggins
Keyword(s):  
Phenotypic Plasticity ◽  
Host Plant ◽  
Host Plants ◽  
Niche Partitioning ◽  
Chemical Defence ◽  
Adult Size ◽  
Cyanogenic Glucosides ◽  
Chemical Defences ◽  
Host Plant Specialization ◽  
Heliconius Cydno

Host plant specialization is a major force driving ecological niche partitioning and diversification in insect herbivores. The cyanogenic defences of Passiflora plants keep most herbivores at bay, but not the larvae of Heliconiu s butterflies, which can both sequester and biosynthesize cyanogenic compounds. Here, we demonstrate that both Heliconius cydno chioneus and H. melpomene rosina have remarkable plasticity in their chemical defences. When feeding on Passiflora species with cyanogenic compounds that they can readily sequester, both species downregulate the biosynthesis of these compounds. By contrast, when fed on Passiflora plants that do not contain cyanogenic glucosides that can be sequestered, both species increase biosynthesis. This biochemical plasticity comes at a fitness cost for the more specialist H. m. rosina , as adult size and weight for this species negatively correlate with biosynthesis levels, but not for the more generalist H. c. chioneus . By contrast, H. m rosina has increased performance when sequestration is possible on its specialized host plant. In summary, phenotypic plasticity in biochemical responses to different host plants offers these butterflies the ability to widen their range of potential hosts within the Passiflora genus, while maintaining their chemical defences.

EVOLUTIONARY DYNAMICS OF HOST-PLANT SPECIALIZATION: A CASE STUDY OF THE TRIBE NYMPHALINI

Evolution ◽  
2007 ◽  
Vol 55 (4) ◽  
pp. 783-796 ◽  
Author(s):  
Niklas Janz ◽  
Klas Nyblom ◽  
Sören Nylin
Keyword(s):  
Host Plant ◽  
Evolutionary Dynamics ◽  
Host Plant Specialization

TUNGAU PADA DAUN MANGGA (Mangifera Indica)

2014 ◽  
Vol 13 (3) ◽  
Author(s):  
Rawati Panjaitan
Keyword(s):  
Life Cycle ◽  
Direct Observation ◽  
Host Plants ◽  
Body Shape ◽  
Leaf Surface ◽  
Mangifera Indica ◽  
Posterior Part ◽  
Mango Leaves

Mites have hostplant specifications or host plants. Mites can be destructive and deadly of which is the host plants a mango crop. Mites on mango crops will cause the leaves yellow and fall off prematurely. This is will lead to the disruption of the productivity of mango. It is necessary for research to identify the mites that infect the mango crop. The method is carried out by direct observation. Mites were taken from the surface of mango leaves later in preservation with several levels of concentration of alcohol, and polyvinyl laktofenol. Then, observed under a microscope and documented for identification purposes. Mites on the leaf surface of manalagi mango (<em>Mangifera indica</em>) found two species, it is <em>Oligonychus</em> sp. and <em>Oligonychus ilicis</em> (Family: Tetranychidae, Superfamily: Tetranychoidea). <em>Oligonychus</em> sp. hallmark is rounded body shape like a spider, with a body is transparent and there are two long seta on posterior part. While <em>Oligonychus ilicis</em> has a characteristic elongated rounded body shape, red, and there is a short posterior seta. <em>Oligonychus</em> sp. and <em>Oligonychus ilicis</em> live as parasites on the surface of mango leaves that can lead to wrinkled leaves, yellow and to fall. <em>Oligonychus</em> life cycle starts from the eggs develop into Nympha and then adult.

Host Plant Specialization Driven by Sexual Selection

2007 ◽  
Vol 169 (6) ◽  
pp. 830
Author(s):  
Tiago B. Quental ◽  
Manus M. Patten ◽  
Pierce
Keyword(s):  
Sexual Selection ◽  
Host Plant ◽  
Host Plant Specialization

scholarly journals Long-Term Cocirculation of Two Strains of Pepino Mosaic Virus in Tomato Crops and Its Effect on Population Genetic Variability

2020 ◽  
Vol 110 (1) ◽  
pp. 49-57 ◽  
Author(s):  
C. Alcaide ◽  
M. P. Rabadán ◽  
M. Juárez ◽  
P. Gómez
Keyword(s):  
Genetic Variability ◽  
Mosaic Virus ◽  
Evolutionary Dynamics ◽  
Geographical Area ◽  
Viral Fitness ◽  
Mixed Infections ◽  
Supporting Evidence ◽  
Pepino Mosaic Virus ◽  
Nucleotide Variability

Mixed viral infections are common in plants, and the evolutionary dynamics of viral populations may differ depending on whether the infection is caused by single or multiple viral strains. However, comparative studies of single and mixed infections using viral populations in comparable agricultural and geographical locations are lacking. Here, we monitored the occurrence of pepino mosaic virus (PepMV) in tomato crops in two major tomato-producing areas in Murcia (southeastern Spain), supporting evidence showing that PepMV disease-affected plants had single infections of the Chilean 2 (CH2) strain in one area and the other area exhibited long-term (13 years) coexistence of the CH2 and European (EU) strains. We hypothesized that circulating strains of PepMV might be modulating the differentiation between them and shaping the evolutionary dynamics of PepMV populations. Our phylogenetic analysis of 106 CH2 isolates randomly selected from both areas showed a remarkable divergence between the CH2 isolates, with increased nucleotide variability in the geographical area where both strains cocirculate. Furthermore, the potential virus–virus interaction was studied further by constructing six full-length infectious CH2 clones from both areas, and assessing their viral fitness in the presence and absence of an EU-type isolate. All CH2 clones showed decreased fitness in mixed infections and although complete genome sequencing indicated a nucleotide divergence of those CH2 clones by area, the magnitude of the fitness response was irrespective of the CH2 origin. Overall, these results suggest that although agroecological cropping practices may be particularly important for explaining the evolutionary dynamics of PepMV in tomato crops, the cocirculation of both strains may have implications on the genetic variability of PepMV populations.

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