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https://www.readbyqxmd.com/read/28448564/insights-into-the-biochemical-defence-and-methylation-of-the-solitary-bee-osmia-rufa-l-a-foundation-for-examining-eusociality-development
#1
Aneta Strachecka, Jacek Chobotow, Jerzy Paleolog, Aleksandra Łoś, Michał Schulz, Dariusz Teper, Halina Kucharczyk, Maciej Grzybek
We examined age-related biochemical and histological changes in the fat bodies and hemolymph of Osmia rufa males and females. We analysed solitary bees during diapause, in October and in April; as well as the flying insects following diapause, in May and June. The trophocyte sizes, as well as the numbers of lipid droplets were the greatest at the beginning of diapause. Subsequently, they decreased along with age. Triglyceride and glucose concentrations systematically decreased in fat body cells but increased in the hemolymph from October to June...
2017: PloS One
https://www.readbyqxmd.com/read/28439397/transcriptomic-analysis-of-maternally-provisioned-cues-for-phenotypic-plasticity-in-the-annual-killifish-austrofundulus-limnaeus
#2
Amie L Romney, Jason E Podrabsky
BACKGROUND: Genotype and environment can interact during development to produce novel adaptive traits that support life in extreme conditions. The development of the annual killifish Austrofundulus limnaeus is unique among vertebrates because the embryos have distinct cell movements that separate epiboly from axis formation during early development, can enter into a state of metabolic dormancy known as diapause and can survive extreme environmental conditions. The ability to enter into diapause can be maternally programmed, with young females producing embryos that do not enter into diapause...
2017: EvoDevo
https://www.readbyqxmd.com/read/28433751/elevated-chaperone-proteins-are-a-feature-of-winter-freeze-avoidance-by-larvae-of-the-goldenrod-gall-moth-epiblema-scudderiana
#3
Guijun Zhang, Janet M Storey, Kenneth B Storey
Winter survival for many insect species includes a need to maintain metabolic homeostasis and structural/functional integrity of macromolecules not only over a wide range of cold temperatures but also in response to rapid temperature change. Chaperones are well-known to protect/stabilize protein structure with regard to heat stress but less is known about their potential involvement in long-term protection of the proteome at subzero temperatures. The present study assessed the participation of chaperone proteins in the cold hardiness of larvae of the goldenrod gall moth, Epiblema scudderiana (Clemens) (Lepidoptera, Olethreutidae), monitoring changes in nine proteins over the winter months as well as their responses to laboratory cold acclimation or anoxia exposure...
April 19, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28430975/behavioral-response-of-the-brown-marmorated-stink-bug-hemiptera-pentatomidae-to-semiochemicals-deployed-inside-and-outside-anthropogenic-structures-during-the-overwintering-period
#4
William R Morrison, Angelita Acebes-Doria, Emily Ogburn, Thomas P Kuhar, James F Walgenbach, J Christopher Bergh, Louis Nottingham, Anthony Dimeglio, Patricia Hipkins, Tracy C Leskey
The brown marmorated stink bug, Halyomorpha halys (Stål), is an invasive species from Asia capable of causing severe agricultural damage. It can also be a nuisance pest when it enters and exits anthropogenic overwintering sites. In recent years, pheromone lures and traps for H. halys have been developed and used to monitor populations in field studies. To date, no study has investigated the applicability of these monitoring tools for use indoors by building residents during the overwintering period. Herein, we 1) assessed when in late winter (diapause) and spring (postdiapause) H...
April 20, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28419148/how-long-to-rest-in-unpredictably-changing-habitats
#5
Mirosław Slusarczyk, Jacek Starzyński, Piotr Bernatowicz
In the present study, we investigated the optimum length of prolonged dormancy (developmental arrest extending over favourable periods) of organisms under uncertain environmental conditions. We used an artificial life model to simulate the evolution of suspended development in the ontogenesis of organisms inhabiting unpredictably changing habitats. A virtual population of semelparous parthenogenetic individuals that varied in a duration of developmental arrest competed for limited resources. At a constant level of available resources, uninterrupted development was the superior life strategy...
2017: PloS One
https://www.readbyqxmd.com/read/28402498/oviposition-strategies-of-florida-culex-melanoconion-mosquitoes
#6
Erik M Blosser, Nathan D Burkett-Cadena
In the genus Culex, oviposition is often generalized as laying floating egg rafts directly on the surface of the water, as reported for arbovirus vectors Culex pipiens L. and Culex tarsalis Coquillett, both members of subgenus Culex. The current work reports on investigations of exceptions to this strategy by species of Melanoconion, a diverse and mostly tropical subgenus of Culex, with many arbovirus vectors. Wild gravid females from Vero Beach, FL, were introduced into outdoor cages with open water, partially covered water, and emergent solid structures for oviposition...
April 11, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28394895/larval-crowding-accelerates-c-elegans-development-and-reduces-lifespan
#7
Andreas H Ludewig, Clotilde Gimond, Joshua C Judkins, Staci Thornton, Dania C Pulido, Robert J Micikas, Frank Döring, Adam Antebi, Christian Braendle, Frank C Schroeder
Environmental conditions experienced during animal development are thought to have sustained impact on maturation and adult lifespan. Here we show that in the model organism C. elegans developmental rate and adult lifespan depend on larval population density, and that this effect is mediated by excreted small molecules. By using the time point of first egg laying as a marker for full maturity, we found that wildtype hermaphrodites raised under high density conditions developed significantly faster than animals raised in isolation...
April 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28379301/embryo-arrest-and-reactivation-potential-candidates-controlling-embryonic-diapause-in-the-tammar-wallaby-and-mink1
#8
Jane C Fenelon, Geoffrey Shaw, Stephen R Frankenberg, Bruce D Murphy, Marilyn B Renfree
Embryonic diapause is period of developmental arrest which requires coordination of a molecular cross-talk between the endometrium and blastocyst to ensure a successful reactivation, but the exact mechanisms are undefined. The objectives of this study were to screen the tammar blastocyst for potential diapause control factors and to investigate the potential for members of the epidermal growth factor (EGF) family to coordinate reactivation. A select number of factors were also examined in the mink to determine whether their expression patterns were conserved across diapause species...
March 31, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28369322/impact-of-prolonged-absence-of-low-temperature-on-adult-eclosion-patterns-of-western-cherry-fruit-fly-diptera-tephritidae
#9
Lisa G Neven, Wee L Yee
Western cherry fruit fly, Rhagoletis indifferens (Curran) (Diptera: Tephritidae), is a serious pest of cherries (Prunus spp.) in the Pacific Northwest of the United States. Previous research suggests that R. indifferens is unlikely to establish in commercial cherry production areas in California and in tropical export markets because cold temperatures, below 5 °C, in those regions appear insufficient to complete diapause. However, it is unclear how prolonged absence of cold exposure affects diapause termination in R...
March 25, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28369111/larval-diapause-termination-in-the-bamboo-borer-omphisa-fuscidentalis
#10
Suphawan Suang, Manaporn Manaboon, Tippawan Singtripop, Kiyoshi Hiruma, Yu Kaneko, Pimonrat Tiansawat, Peter Neumann, Panuwan Chantawannakul
In insects, juvenile hormone (JH) and 20-hydroxyecdysone (20E) regulate larval growth and molting. However, little is known about how this cooperative control is terminating larval diapause especially in the bamboo borer, Omphisa fuscidentalis. In both in vivo and in vitro experiments, we here measured the expression levels of genes which were affected by juvenile hormone analogue (JHA: S-methoprene) and 20-hydroxyecdysone (20E) in diapausing O. fuscidentalis larvae. Corresponding mRNA expression changes in the subesophageal ganglion (SG) and prothoracic gland (PG) were evaluated using qRT-PCR...
2017: PloS One
https://www.readbyqxmd.com/read/28365384/adaptive-significance-of-precocious-pupation-in-the-bean-blister-beetle-epicauta-gorhami-coleoptera-meloidae-a-hypermetamorphic-insect
#11
Yoshinori Shintani, Misato Terao, Seiji Tanaka
Larvae of the bean blister beetle, Epicauta gorhami Marseul (Coleoptera: Meloidae), feed on grasshopper eggs in soil and undergo hypermetamorphosis. They normally enter diapause as a pseudopupa at the fifth instar, a form characteristic of hypermetamorphosis for meloid beetles. However, fourth-instar larvae exposed to long days and high temperature avoid pseudopupal diapause and pupate directly from the fourth instar. Fourth-instar larvae also tend to pupate precociously with a smaller body size if they are deprived of food...
March 30, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28363845/the-expression-of-the-clock-gene-cycle-has-rhythmic-pattern-and-is-affected-by-photoperiod-in-the-moth-sesamia-nonagrioides
#12
Dimitrios Kontogiannatos, Theodoros Gkouvitsas, Anna Kourti
To obtain clues to the link between the molecular mechanism of circadian and photoperiod clocks, we have cloned the circadian clock gene cycle (Sncyc) in the corn stalk borer, Sesamia nonagrioides, which undergoes facultative diapause controlled by photoperiod. Sequence analysis revealed a high degree of conservation among insects for this gene. SnCYC consists of 667 amino acids and structural analysis showed that it contains a BCTR domain in its C-terminal in addition to the common domains found in Drosophila CYC, i...
March 29, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/28350505/maladaptation-to-acute-metal-exposure-in-resurrected-daphnia-ambigua-clones-after-decades-of-increasing-contamination
#13
Mary Alta Rogalski
Human environmental impacts have driven some of the strongest and fastest phenotypic changes recorded in wild animal populations. Across populations, this variation is often adaptive, because populations evolve fitness advantages in response to human-modified environments. Yet some populations fail to adapt to changing environments. Evidenced by declines in relative fitness, such seemingly maladaptive outcomes are less common but may be more likely in human-modified contexts. Further, our ability to investigate the dynamics of these adaptive and maladaptive responses over time is typically limited in natural systems...
April 2017: American Naturalist
https://www.readbyqxmd.com/read/28334137/geographic-variation-of-diapause-induction-rates-in-trichogramma-drendrolimi-hymenoptera-trichogrammatidae-in-china
#14
Jun-Jie Zhang, Nicolas Desneux, Giovanni Benelli, Lian-Sheng Zang, Wen-Mei Du, Chang-Chun Ruan
Diapause variation is a key factor affecting the development and success of parasitoids employed as biological control agents. Trichogramma dendrolimi Matsumura is mass-reared for biocontrol purposes in several countries around the world. Here we investigated the rate of diapause induction in three populations of T. dendrolimi from different regions in China: Heilongjiang (44° 55' N, 128° 26' E; HLJ), Liaoning (40° 18' N, 123° 22' E; LN), and Jiangsu province (32° 30' N, 120° 09' E; JS). We measured the rates of diapause induction for populations from each region when exposed to temperatures of 8, 10, 12, and 14 °C, for periods ranging from 5 to 35 d...
April 1, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28300610/changes-in-microrna-abundance-may-regulate-diapause-in-the-flesh-fly-sarcophaga-bullata
#15
Julie A Reynolds, Justin T Peyton, David L Denlinger
Diapause, an alternative developmental pathway characterized by changes in developmental timing and metabolism, is coordinated by molecular mechanisms that are not completely understood. MicroRNA (miRNA) mediated gene silencing is emerging as a key component of animal development and may have a significant role in initiating, maintaining, and terminating insect diapause. In the present study, we test this possibility by using high-throughput sequencing and qRT-PCR to discover diapause-related shifts in miRNA abundance in the flesh fly, Sarcophaga bullata...
March 12, 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28292919/molecular-determinants-of-the-regulation-of-development-and-metabolism-by-neuronal-eif2%C3%AE-phosphorylation-in-caenorhabditis-elegans
#16
Warakorn Kulalert, Harini Sadeeshkumar, Ying K Zhang, Frank C Schroeder, Dennis H Kim
Cell-non-autonomous effects of signaling in the nervous system of animals can influence diverse aspects of organismal physiology. We previously showed that phosphorylation of Ser49 of eIF2α; in two chemosensory neurons by PEK-1/PERK promotes entry of Caenorhabditis elegans into dauer diapause. Here, we identified and characterized the molecular determinants that confer sensitivity to effects of neuronal eIF2α phosphorylation on development and physiology of C. elegans Isolation and characterization of mutations in eif-2Ba encoding the alpha subunit of eIF2B support a conserved role previously established by studies in yeast for eIF2Bα in providing a binding site for phosphorylated eIF2α to inhibit the exchange factor eIF2B catalytic activity that is required for translation initiation...
March 14, 2017: Genetics
https://www.readbyqxmd.com/read/28284225/how-does-the-dengue-vector-mosquito-aedes-albopictus-respond-to-global-warming
#17
Pengfei Jia, Xiang Chen, Jin Chen, Liang Lu, Qiyong Liu, Xiaoyue Tan
BACKGROUND: Global warming has a marked influence on the life cycle of epidemic vectors as well as their interactions with human beings. The Aedes albopictus mosquito as the vector of dengue fever surged exponentially in the last decade, raising ecological and epistemological concerns of how climate change altered its growth rate and population dynamics. As the global warming pattern is considerably uneven across four seasons, with a confirmed stronger effect in winter, an emerging need arises as to exploring how the seasonal warming effects influence the annual development of Ae...
March 11, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28276459/isolation-mediates-persistent-founder-effects-on-zooplankton-colonisation-in-new-temporary-ponds
#18
Anna Badosa, Dagmar Frisch, Andy J Green, Ciro Rico, Africa Gómez
Understanding the colonisation process in zooplankton is crucial for successful restoration of aquatic ecosystems. Here, we analyzed the clonal and genetic structure of the cyclical parthenogenetic rotifer Brachionus plicatilis by following populations established in new temporary ponds during the first three hydroperiods. Rotifer populations established rapidly after first flooding, although colonisation was ongoing throughout the study. Multilocus genotypes from 7 microsatellite loci suggested that most populations (10 of 14) were founded by few clones...
March 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28250105/neuronal-function-of-the-mrna-decapping-complex-determines-survival-of-caenorhabditis-elegans-at-high-temperature-through-temporal-regulation-of-heterochronic-gene-expression
#19
Fivos Borbolis, Christina-Maria Flessa, Fani Roumelioti, George Diallinas, Dimitrios J Stravopodis, Popi Syntichaki
In response to adverse environmental cues, Caenorhabditis elegans larvae can temporarily arrest development at the second moult and form dauers, a diapause stage that allows for long-term survival. This process is largely regulated by certain evolutionarily conserved signal transduction pathways, but it is also affected by miRNA-mediated post-transcriptional control of gene expression. The 5'-3' mRNA decay mechanism contributes to miRNA-mediated silencing of target mRNAs in many organisms but how it affects developmental decisions during normal or stress conditions is largely unknown...
March 2017: Open Biology
https://www.readbyqxmd.com/read/28235563/characterisation-analysis-of-expression-and-localisation-of-circadian-clock-genes-from-the-perspective-of-photoperiodism-in-the-aphid-acyrthosiphon-pisum
#20
Miquel Barberà, Jorge Mariano Collantes-Alegre, David Martínez-Torres
Aphids are typical photoperiodic insects that switch from viviparous parthenogenetic reproduction typical of long day seasons to oviparous sexual reproduction triggered by the shortening of photoperiod in autumn yielding an overwintering egg in which an embryonic diapause takes place. While the involvement of the circadian clock genes in photoperiodism in mammals is well established, there is still some controversy on their participation in insects. The availability of the genome of the pea aphid Acyrthosiphon pisum places this species as an excellent model to investigate the involvement of the circadian system in the aphid seasonal response...
February 22, 2017: Insect Biochemistry and Molecular Biology
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