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Khan F, Kim K, Sung J, Lim H, Kim SG, Choi MY, Kim Y. A novel physiological function of pheromone biosynthesis-activating neuropeptide in production of aggregation pheromone. Sci Rep 2023; 13:5551. [PMID: 37019976 PMCID: PMC10076286 DOI: 10.1038/s41598-023-32833-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 04/03/2023] [Indexed: 04/07/2023] Open
Abstract
The western flower thrips, Frankliniella occidentalis, is an insect pest, and its aggregation pheromone (AP) plays a crucial role in the recruitment of both sexes. A novel pheromone biosynthesis-activating neuropeptide (PBAN)-like gene is encoded in F. occidentalis genome, but its physiological function has yet to be elucidated. This study hypothesized the physiological role played by PBAN in mediating AP production. AP has been known to be produced only by male adults in F. occidentalis. Surprisingly, our extraction of headspace volatiles contained two AP components in females as well as in males with similar composition. PBAN injection elevated the AP production whereas RNA interference (RNAi) of the gene expression suppressed the AP production in both sexes. A biosynthetic pathway to produce AP components were predicted and the enzymes catalyzing the main steps were confirmed in their expressions. Individual RNAi treatments of these genes significantly suppressed AP production. RNAi of PBAN gene downregulated the expressions of these biosynthesis-associated genes in both sexes. These results suggest that the novel neuropeptide acts as PBAN mediating AP production through stimulating its biosynthetic machinery in F. occidentalis.
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Affiliation(s)
- Falguni Khan
- Department of Plant Medicals, College of Life Sciences, Andong National University, Andong, 36720, Korea
| | - Keono Kim
- Department of Food Life Science, College of Life Sciences, Andong National University, Andong, 36720, Korea
| | - Jeehye Sung
- Department of Food Life Science, College of Life Sciences, Andong National University, Andong, 36720, Korea
| | - Hangah Lim
- Department of Biological Sciences, KAIST, Daejon, 34141, Korea
| | - Sang-Gyu Kim
- Department of Biological Sciences, KAIST, Daejon, 34141, Korea
| | - Man-Yeon Choi
- Horticultural Crops Research Unit, USADA-ARS, Corvalis, OR, 97330, USA
| | - Yonggyun Kim
- Department of Plant Medicals, College of Life Sciences, Andong National University, Andong, 36720, Korea.
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Unelius CR, Ganji S, Krokene P. Linoleic Acid Promotes Emission of Bark Beetle Semiochemicals by Fungal Symbionts. J Chem Ecol 2023; 49:59-66. [PMID: 36585598 DOI: 10.1007/s10886-022-01400-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 12/17/2022] [Accepted: 12/19/2022] [Indexed: 12/31/2022]
Abstract
Tree-killing bark beetles in conifer forests vector symbiotic fungi that are thought to help the beetles kill trees. Fungal symbionts emit diverse volatile blends that include bark beetle semiochemicals involved in mating and host localization. In this study, all 12 tested fungal isolates emitted beetle semiochemicals when growing in medium amended with linoleic acid. These semiochemicals included the spiroacetals chalcogran, trans-conophthorin and exo-brevicomin, as well as 2-methyl-3-buten-1-ol, the main aggregation pheromone component of the spruce bark beetle Ips typographus. The emission of these compounds was affected by the type of fatty acid present (linoleic vs. oleic acid). Accumulating evidence shows that the fatty acid composition in conifer bark can facilitate colonization by bark beetles and symbiotic fungi, whereas the fatty acid composition of non-host trees can be detrimental for beetle larvae or fungi. We hypothesize that beetles probe the fatty acid composition of potential host trees to test their suitability for beetle development and release of semiochemicals by symbiotic fungi.
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Abstract
The mountain pine beetle epidemic has highlighted the complex interactions of bark beetles with conifer host defenses. In these interactions, oleoresin terpenoids and volatiles, produced and released by the host tree, can be both harmful and beneficial to the beetle's success in colonizing a tree and completing its life cycle. The insect spends almost its entire life, from egg to adult, within the bark and phloem of a pine host, exposed to large quantities of complex mixtures of oleoresin terpenoids. Conifer oleoresin comprises mostly monoterpenes and diterpene resin acids as well as many different sesquiterpenes. It functions as a major chemical and physical defense system. However, the insect has evolved host colonization behavior and enzymes for terpenoid metabolism and detoxification that allow it to overcome some of the terpenoid defenses and, importantly, to co-opt pine monoterpenes as cues for host search and as a precursor for its own pheromone system. The insect-associated microbiome also plays a role in the metabolism of conifer terpenoids.
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Affiliation(s)
- Christine C Chiu
- Michael Smith Laboratories, University of British Columbia, Vancouver, British Columbia, Canada;
| | - Joerg Bohlmann
- Michael Smith Laboratories, University of British Columbia, Vancouver, British Columbia, Canada;
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Du H, Fang J, Shi X, Yu C, Deng M, Zhang S, Liu F, Zhang Z, Han F, Kong X. Insights into the Divergence of Chinese Ips Bark Beetles during Evolutionary Adaptation. Biology 2022; 11:384. [PMID: 35336758 PMCID: PMC8945085 DOI: 10.3390/biology11030384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 02/25/2022] [Accepted: 02/26/2022] [Indexed: 12/02/2022]
Abstract
Simple Summary Bark beetle species of the genus Ips are among the major pests of Chinese conifer forests. Based on mitochondrial genome and SNP, we investigated the phylogenetic relationships and evolutionary trends of 19 populations of six Ips species that had serious outbreaks in recent years. Our results demonstrated the relationships between Ips evolution and host plants, pheromones, and altitudinal differences, and provided new insights into the mechanism of adaptive evolution of Ips bark beetles. Abstract Many bark beetles of the genus Ips are economically important insect pests that cause severe damage to conifer forests worldwide. In this study, sequencing the mitochondrial genome and restriction site-associated DNA of Ips bark beetles helps us understand their phylogenetic relationships, biogeographic history, and evolution of ecological traits (e.g., pheromones and host plants). Our results show that the same topology in phylogenetic trees constructed in different ways (ML/MP/BI) and with different data (mtDNA/SNP) helps us to clarify the phylogenetic relationships between Chinese Ips bark beetle populations and Euramerican species and their higher order clades; Ips bark beetles are polyphyletic. The structure of the mitochondrial genome of Ips bark beetles is similar and conserved to some extent, especially in the sibling species Ips typographus and Ips nitidus. Genetic differences among Ips species are mainly related to their geographic distribution and different hosts. The evolutionary pattern of aggregation pheromones of Ips species reflects their adaptations to the environment and differences among hosts in their evolutionary process. The evolution of Ips species is closely related to the uplift of the Qinghai-Tibet Plateau and host switching. Our study addresses the evolutionary trend and phylogenetic relationships of Ips bark beetles in China, and also provides a new perspective on the evolution of bark beetles and their relationships with host plants and pheromones.
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Tian X, Su X, Li C, Zhou Y, Li S, Guo J, Fan Q, Lü S, Zhang Y. Draft genome of the blister beetle, Epicauta chinensis. Int J Biol Macromol 2021; 193:1694-1706. [PMID: 34742848 DOI: 10.1016/j.ijbiomac.2021.11.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 10/31/2021] [Accepted: 11/01/2021] [Indexed: 01/07/2023]
Abstract
Existence of cantharidin (CTD) in blister beetles is a significant ecological adaptive mechanism that defends against predators and regulates courtship and mating behaviors. To better understand CTD biosynthetic information as well as its biology and pharmacology, we assembled a genome of 151.88 Mb for Epicauta chinensis using PacBio sequencing technology. Gene annotation yielded 249,238 repeats, 527 non-coding RNAs and 12,520 protein-coding genes. Compared to other 11 insects, expansions of gene families in E. chinensis for most core gene families likely associated with environmental adaptation, such as chemoreception, immunity, and detoxification. We further annotated P450s and immune-related genes, a total of 117 putative P450s comprising 7 CYP2, 67 CYP3, 36 CYP4, and 7 mitochondrial P450s and 281 immune-related genes were identified. Comparative analysis of the insect immune repertoires indicated presence of immune genes detected only from Coleopteran insects such as MD2-like. This suggested a lineage-specific gene evolution for Coleopteran insects. Based on the gene family evolution analysis, we identified two probable candidate genes including CYP4TT1 and phytanoyl-CoA dioxygenase for CTD biosynthesis. The high-quality reference genome of E. chinensis provides the genetic basis for further investigation of CTD biosynthesis and in-depth studies of the development and evolution of blister beetles.
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Affiliation(s)
- Xing Tian
- Key Laboratory of Plant Protection Resources & Pest Management of the Ministry of Education, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xinxin Su
- Key Laboratory of Plant Protection Resources & Pest Management of the Ministry of Education, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Chenjing Li
- Key Laboratory of Plant Protection Resources & Pest Management of the Ministry of Education, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yifei Zhou
- Key Laboratory of Plant Protection Resources & Pest Management of the Ministry of Education, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Shuying Li
- Key Laboratory of Plant Protection Resources & Pest Management of the Ministry of Education, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jiamin Guo
- Key Laboratory of Plant Protection Resources & Pest Management of the Ministry of Education, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Qiqi Fan
- Key Laboratory of Plant Protection Resources & Pest Management of the Ministry of Education, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Shumin Lü
- Key Laboratory of Plant Protection Resources & Pest Management of the Ministry of Education, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Yalin Zhang
- Key Laboratory of Plant Protection Resources & Pest Management of the Ministry of Education, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China.
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Goodman JR, Ewald PW. The evolution of barriers to exploitation: Sometimes the Red Queen can take a break. Evol Appl 2021; 14:2179-2188. [PMID: 34603491 PMCID: PMC8477591 DOI: 10.1111/eva.13280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 05/22/2021] [Accepted: 07/04/2021] [Indexed: 11/29/2022] Open
Abstract
We propose a general barrier theory as an evolutionary framework for understanding coevolutionary effects of conflicts of interest in natural and human systems. It is generalized from the barrier theory of cancer, which describes how cancer develops through the evasion of mechanisms, that block unregulated cellular reproduction and survival. Barriers are naturally evolved or artificially implemented mechanisms for blocking exploitation; restraints are mechanisms that impede but do not block exploitation. When conflicts of interest arise, selection will favor exploiters that are capable of overcoming barriers and restraints. When barriers are in place, they halt, at least temporarily, coevolutionary arms races (the Red Queen can stop running). Barriers occur in a broad spectrum of interactions characterized by conflicts of interest: barriers to cellular survival (apoptosis) and reproduction (cell cycle arrest) may block a virus from replicating its genome through reproduction of its host cell. Vaccines may completely protect against targeted pathogens. A plant may escape herbivory by evolving defensive chemicals that block herbivory. Obligate mutualisms may evolve when barriers to horizontal transmission favor symbionts that increasingly lose mechanisms that contribute to horizontal transmission. Here, we show how the barrier theory applies across a spectrum of natural and social systems.
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Affiliation(s)
- Jonathan R. Goodman
- Leverhulme Centre for Human Evolutionary StudiesUniversity of CambridgeCambridgeUK
| | - Paul W. Ewald
- Department of BiologyUniversity of LouisvilleLouisvilleKentuckyUSA
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Sun Y, Fu D, Kang X, Liu B, Ning H, Chen H. Function of mevalonate pathway genes in the synthesis of frontalin in Chinese white pine beetle, Dendroctonus armandi (curculionidae: Scolytinae). Arch Insect Biochem Physiol 2021; 107:e21828. [PMID: 34173689 DOI: 10.1002/arch.21828] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 05/31/2021] [Accepted: 06/10/2021] [Indexed: 06/13/2023]
Abstract
The Chinese white pine beetle (Dendroctonus armandi Tsai and Li) is a significant pest of pine forests in the Qinling and Bashan Mountains of China. Adult males commonly produce frontalin using precursors synthesized through the mevalonate pathway, which is regulated by juvenile hormone III (JHIII). In this study, the expression levels of mevalonate pathway genes were quantified after phloem feeding and topical application of the JHIII solution. The frontalin was quantified by gas chromatography-mass spectrometry. Both the phloem feeding and JHIII treatments produced an evident upregulation in the male gut, mainly in 3-hydroxy-3-methylglutaryl-CoA synthase (HMGS) and 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR). Moreover, HMGS, HMGR, isopentenyl diphosphate isomerase, and geranyl diphosphate synthase/farnesyl diphosphate synthase were upregulated in fed and JHIII-stimulated males of D. armandi under both conditions (solitary and paired). The expression levels were higher in paired compared to solitary males. Males had higher expression levels compared with females. Correspondingly, the phloem-feeding males produced more frontalin than JHIII-treated males, and the production of frontalin was higher in paired males than in solitary males. The knockdown of mevalonate pathway genes using RNAi in vivo effectively reduced the messenger RNA level of these genes and inhibited the production of frontalin. Among them, the silencing of HMGR or HMGS genes reduced the synthesis of frontalin most significantly.
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Affiliation(s)
- Yaya Sun
- College of Forestry, Northwest A and F University, Yangling, Shaanxi, China
| | - Danyang Fu
- College of Forestry, Northwest A and F University, Yangling, Shaanxi, China
| | - Xiaotong Kang
- College of Forestry, Northwest A and F University, Yangling, Shaanxi, China
| | - Bin Liu
- College of Forestry, Northwest A and F University, Yangling, Shaanxi, China
| | - Hang Ning
- College of Forestry, Northwest A and F University, Yangling, Shaanxi, China
| | - Hui Chen
- College of Forestry, Northwest A and F University, Yangling, Shaanxi, China
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, Guangdong, China
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8
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Fang JX, Du HC, Shi X, Zhang SF, Liu F, Zhang Z, Zu PJ, Kong XB. Monoterpenoid signals and their transcriptional responses to feeding and juvenile hormone regulation in bark beetle Ips hauseri. J Exp Biol 2021; 224:jeb.238030. [PMID: 33795419 DOI: 10.1242/jeb.238030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 03/24/2021] [Indexed: 11/20/2022]
Abstract
Hauser's engraver beetle, Ips hauseri, is a serious pest in spruce forest ecosystems in Central Asia. Its monoterpenoid signal production, transcriptome responses and potential regulatory mechanisms remain poorly understood. The quality and quantity of volatile metabolites in hindgut extracts of I. hauseri were found to differ between males and females and among three groups: beetles that were newly emerged, those with a topical application of juvenile hormone III (JHIII) and those that had been feeding for 24 h. Feeding males definitively dominated monoterpenoid signal production in I. hauseri, which uses (4S)-(-)-ipsenol and (S)-(-)-cis-verbenol to implement reproductive segregation from Ipstypographus and Ipsshangrila. Feeding stimulation induced higher expression of most genes related to the biosynthesis of (4S)-(-)-ipsenol than JHIII induction, and showed a male-specific mode in I. hauseri. JHIII stimulated males to produce large amounts of (-)-verbenone and also upregulated the expression of several CYP6 genes, to a greater extent in males than in females. The expression of genes involved in the metabolism of JHIII in females and males was also found to be upregulated. Our results indicate that a species-specific aggregation pheromone system for I. hauseri, consisting of (4S)-(-)-ipsenol and S-(-)-cis-verbenol, can be used to monitor population dynamics or mass trap killing. Our results also enable a better understanding of the bottom-up role of feeding behaviors in mediating population reproduction/aggregation and interspecific interactions.
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Affiliation(s)
- Jia Xing Fang
- Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
| | - Hui Cong Du
- Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
| | - Xia Shi
- Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
| | - Su Fang Zhang
- Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
| | - Fu Liu
- Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
| | - Zhen Zhang
- Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
| | - Peng Juan Zu
- Department of Geography, University of Zurich, CH-8057 Zurich, Switzerland
| | - Xiang Bo Kong
- Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
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Netherer S, Kandasamy D, Jirosová A, Kalinová B, Schebeck M, Schlyter F. Interactions among Norway spruce, the bark beetle Ips typographus and its fungal symbionts in times of drought. J Pest Sci (2004) 2021; 94:591-614. [PMID: 34720785 PMCID: PMC8550215 DOI: 10.1007/s10340-021-01341-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 01/07/2021] [Accepted: 01/20/2021] [Indexed: 05/04/2023]
Abstract
Resilience and functionality of European Norway spruce forests are increasingly threatened by mass outbreaks of the bark beetle Ips typographus promoted by heat, wind throw and drought. Here, we review current knowledge on Norway spruce and I. typographus interactions from the perspective of drought-stressed trees, host selection, colonisation behaviour of beetles, with multi-level effects of symbiotic ophiostomatoid fungi. By including chemo-ecological, molecular and behavioural perspectives, we provide a comprehensive picture on this complex, multitrophic system in the light of climate change. Trees invest carbon into specialised metabolism to produce defence compounds against biotic invaders; processes that are strongly affected by physiological stress such as drought. Spruce bark contains numerous terpenoid and phenolic substances, which are important for bark beetle aggregation and attack success. Abiotic stressors such as increased temperatures and drought affect composition, amounts and emission rates of volatile compounds. Thus, drought events may influence olfactory responses of I. typographus, and further the pheromone communication enabling mass attack. In addition, I. typographus is associated with numerous ophiostomatoid fungal symbionts with multiple effects on beetle life history. Symbiotic fungi degrade spruce toxins, help to exhaust tree defences, produce beetle semiochemicals, and possibly provide nutrition. As the various fungal associates have different temperature optima, they can influence the performance of I. typographus differently under changing environmental conditions. Finally, we discuss why effects of drought on tree-killing by bark beetles are still poorly understood and provide an outlook on future research on this eruptive species using both, field and laboratory experiments.
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Affiliation(s)
- Sigrid Netherer
- Department of Forest and Soil Sciences, University of Natural Resources and Life Sciences, BOKU, Vienna, Austria
| | - Dineshkumar Kandasamy
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Jena, Germany
| | - Anna Jirosová
- ETM Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, CULS, Praha-Suchdol, Czech Republic
| | - Blanka Kalinová
- ETM Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, CULS, Praha-Suchdol, Czech Republic
| | - Martin Schebeck
- Department of Forest and Soil Sciences, University of Natural Resources and Life Sciences, BOKU, Vienna, Austria
| | - Fredrik Schlyter
- ETM Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, CULS, Praha-Suchdol, Czech Republic
- Chemical Ecology Plant Protection Department, Swedish University of Agricultural Sciences, SLU, Alnarp, Sweden
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Paczkowski S, Datta P, Irion H, Paczkowska M, Habert T, Pelz S, Jaeger D. Evaluation of Early Bark Beetle Infestation Localization by Drone-Based Monoterpene Detection. Forests 2021; 12:228. [DOI: 10.3390/f12020228] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The project PROTECTFOREST deals with improvements in early bark beetle (e.g., Ips typographus and Pityogenes chalcographus) detection to allow for fast and effective response to initial infestation. The removal of trees in the early infestation stage can prohibit bark beetle population gradation and successive timber price decrease. A semiconductor gas sensor array was tested in the lab and attached to a drone under artificial and real-life field conditions. The sensor array was able to differentiate between α-pinene amounts and between different temperatures under lab conditions. In the field, the sensor responded to a strong artificial α-pinene source. The real-life field trial above a spruce forest showed preliminary results, as technical and environmental conditions compromised a proof of principle. Further research will evaluate the detection rate of infested trees for the new proposed sensor concept.
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Hambalko J, Gajdoš P, Nicaud JM, Ledesma-Amaro R, Tupec M, Pichová I, Čertík M. Production of Long Chain Fatty Alcohols Found in Bumblebee Pheromones by Yarrowia lipolytica. Front Bioeng Biotechnol 2021; 8:593419. [PMID: 33490049 PMCID: PMC7820814 DOI: 10.3389/fbioe.2020.593419] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 12/08/2020] [Indexed: 11/13/2022] Open
Abstract
Fatty alcohols (FA-OH) are aliphatic unbranched primary alcohols with a chain of four or more carbon atoms. Besides potential industrial applications, fatty alcohols have important biological functions as well. In nature, fatty alcohols are produced as a part of a mixture of pheromones in several insect species, such as moths, termites, bees, wasps, etc. In addition, FA-OHs have a potential for agricultural applications, for example, they may be used as a suitable substitute for commercial insecticides. The insecticides have several drawbacks associated with their preparation, and they exert a negative impact on the environment. Currently, pheromone components are prepared mainly through the catalytic hydrogenation of plant oils and petrochemicals, which is an unsustainable, ecologically unfriendly, and highly expensive process. The biotechnological production of the pheromone components using engineered microbial strains and through the expression of the enzymes participating in the biosynthesis of these components is a promising approach that ensures ecological sustenance as well. The present study was aimed at evaluating the production of FA-OHs in the oleaginous yeast, Yarrowia lipolytica, with different lengths of fatty-acyl chains by expressing the fatty acyl-CoA reductase (FAR) BlapFAR4 from B. lapidarius, producing C16:0-OH, C16:1Δ9-OH, and lower quantities of both C14:0-OH and C18:1Δ9-OH, and BlucFAR1 from B. lucorum, producing FA-OHs with a chain length of 18-26 carbon atoms, in this yeast. Among the different novel Y. lipolytica strains used in the present study, the best results were obtained with JMY7086, which carried several lipid metabolism modifications and expressed the BlucFAR1 gene under the control of a strong constitutive promoter 8UAS-pTEF. JMY7086 produced only saturated fatty alcohols with chain lengths from 18 to 24 carbon atoms. The highest titer and accumulation achieved were 166.6 mg/L and 15.6 mg/g DCW of fatty alcohols, respectively. Unlike JMY7086, the BlapFAR4-expressing strain JMY7090 produced only 16 carbon atom-long FA-OHs with a titer of 14.6 mg/L.
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Affiliation(s)
- Jaroslav Hambalko
- Faculty of Chemical and Food Technology, Institute of Biotechnology, Slovak University of Technology, Bratislava, Slovakia
| | - Peter Gajdoš
- Faculty of Chemical and Food Technology, Institute of Biotechnology, Slovak University of Technology, Bratislava, Slovakia
| | - Jean-Marc Nicaud
- French National Research Institute for Agriculture (INRAE), Food and Environment, AgroParisTech, Micalis Institute, Université Paris-Saclay, Jouy-en-Josas, France
| | - Rodrigo Ledesma-Amaro
- Department of Bioengineering and Imperial College Centre for Synthetic Biology, Faculty of Engineering, Imperial College London, London, United Kingdom
| | - Michal Tupec
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czechia
| | - Iva Pichová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czechia
| | - Milan Čertík
- Faculty of Chemical and Food Technology, Institute of Biotechnology, Slovak University of Technology, Bratislava, Slovakia
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Lei G, Fu Y, Wu WJ. Type and distribution of sensilla in the antennae of Euplatypus parallelus (F.) (Coleoptera: Curculionidea, Platypodinae). PLoS One 2020; 15:e0241275. [PMID: 33108376 PMCID: PMC7591032 DOI: 10.1371/journal.pone.0241275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 10/12/2020] [Indexed: 11/18/2022] Open
Abstract
Euplatypus parallelus (F.) (Coleoptera: Curculionidea) is the most destructive cosmopolitan insect pest of the Platypodinae. Pheromone-based luring agents are used currently in controlling bark beetle. Antennae are the primary insect organs sensing volatiles of host trees and pheromones of pioneer males. We studied the external morphology of antennae and the type, distribution, and the number of the beetle sensilla. Our results show E. parallelus have a geniculate antenna composed of 6 segments, namely the scape, 4-segmented funicle and club. Ninety-seven percent of the antennal sensors were distributed in the club, and 3% were distributed in the scape and funicle. 6 types of sensilla on the antennae were found, including sensilla trichodea (subtypes: STI, STII and STIII), sensilla basiconica (subtypes: SBI, SBII, SBIII and SBIV), sensilla chaetica (subtypes: SChI, SChII and SChIII), as well as sensilla coeloconica, sensilla campaniform and sensilla furcatea. There was no significant difference in the type, distribution and number of sensilla in males and females. No significant difference in the shape and distribution of antennae was found between sexes, but the length of antennae and the number of SChI, SChII, STI, SBI, SBIII and SBIV were significantly larger in females than males. We revealed the external cuticular structure of the antennae in E. parallelus, which can be used to guide future electrophysiological investigations to understand the ability of this beetle to detect semiochemicals.
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Affiliation(s)
- Gaoke Lei
- Laboratory of Insect Ecology, South China Agricultural University, Guangzhou, China
| | - Yueguan Fu
- Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Science, Haikou, China
| | - Wei-Jian Wu
- Laboratory of Insect Ecology, South China Agricultural University, Guangzhou, China
- * E-mail:
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13
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Burger BV, Slade D, Bekker MZ, Goitom AH. Mammalian exocrine secretions XIX. Chemical characterization of the interdigital secretion of the Black Wildebeest, Connochaetes gnou. ACTA ACUST UNITED AC 2020; 75:339-351. [PMID: 32573484 DOI: 10.1515/znc-2019-0159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 05/11/2020] [Indexed: 11/15/2022]
Abstract
Using gas chromatography (GC) in conjunction with electron impact mass spectrometry and retention-time comparison, 94 compounds, ranging from 2-methyl-2-propenal to octadecanoic acid, were identified in the interdigital secretions of male and female black wildebeests, Connochaetes gnou (also known as the white-tailed gnu). The constituents of these secretions belong to many different compound classes, including hydrocarbons, alcohols, aromatics and aliphatic carbonyl compounds including carboxylic acids as well as carboxylic acid esters. Relatively small quantitative differences were found between the male and female interdigital secretions. It was concluded that these compounds probably do not play a significant role in territorial marking or in chemical communication between males and females of the species, but they could be involved in preserving the remarkably strong attachment between members of social subgroups in black wildebeest populations.
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Affiliation(s)
- Barend V Burger
- Laboratory for Ecological Chemistry, Stellenbosch University, Stellenbosch 7600, South Africa, E-mail:
| | - Desmond Slade
- Laboratory for Ecological Chemistry, Stellenbosch University, Stellenbosch 7600, South Africa
- Present address: National Center for Natural Products Research, Thad Cochran Research Center, School of Pharmacy, University of Mississippi, MS 38677, USA
| | - Marlize Z Bekker
- Laboratory for Ecological Chemistry, Stellenbosch University, Stellenbosch 7600, South Africa
- Present address: The Australian Wine Research Institute, Glen Osmond, SA 5064, Australia
| | - Aron H Goitom
- Laboratory for Ecological Chemistry, Stellenbosch University, Stellenbosch 7600, South Africa
- Present address: Department of Chemistry, Eritrea Institute of Technology, Asmara, Eritrea
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Isitt RL, Bleiker KP, Pureswaran DS, Hillier NK, Huber DPW. Local, Geographical, and Contextual Variation in the Aggregation Pheromone Blend of the Spruce Beetle, Dendroctonus rufipennis (Coleoptera: Curculionidae). J Chem Ecol 2020; 46:497-507. [PMID: 32557085 DOI: 10.1007/s10886-020-01185-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 03/02/2020] [Accepted: 05/15/2020] [Indexed: 11/28/2022]
Abstract
Prior research from trapping experiments using synthetic pheromone components suggested the existence of local and geographical variation in the pheromone system of the spruce beetle, Dendroctonus rufipennis (Kirby). To test hypotheses concerning variation in the spruce beetle's aggregation pheromone blend, we extracted volatiles from the hindguts of individual spruce beetles sampled from sites in eastern Canada (Nova Scotia and Newfoundland) and western Canada (British Columbia and Alberta) and quantified the amounts of four known aggregation pheromone components within each sample. Chiral analyses were performed on a subset of samples. Frontalin (1,5-dimethyl-6,8-dioxabicyclo[3.2.1]octane) was more dominant in western Canada, whereas MCOL (1-methyl-2-cyclohexen-1-ol) and seudenol (3-methyl-2-cyclohexen-1-ol) were more dominant in the east. Verbenene (4-methylene-6,6-dimethylbicyclo[3.1.1]hept-2-ene) was prevalent only in one of our six sites (Rocky Mountain House, AB). Female beetles in Rocky Mountain House (AB) also produced a higher proportion of (+)-frontalin than females from the other sites, and a comparison to previously published data suggests additional geographic variation that was not captured among our sites. When paired with a male in a gallery, female spruce beetles produced pheromone blends with more frontalin and less MCOL compared to solitary female beetles. Our results show that variation in the spruce beetle's pheromone blend exists at both large and small spatial scales, possibly a consequence of local selective pressures and assortative mating.
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Affiliation(s)
- R L Isitt
- Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada. .,Ecosystem Science and Management Program, University of Northern British Columbia, Prince George, British Columbia, Canada.
| | - K P Bleiker
- Canadian Forest Service, Pacific Forestry Centre, Victoria, British Columbia, Canada
| | - D S Pureswaran
- Canadian Forest Service, Laurentian Forestry Centre, Quebec City, Quebec, Canada
| | - N K Hillier
- Department of Biology, Acadia University, Wolfville, Nova Scotia, Canada
| | - D P W Huber
- Ecosystem Science and Management Program, University of Northern British Columbia, Prince George, British Columbia, Canada
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15
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Iovinella I, Pierattini EC, Bedini S, Dani FR, Guarino S, Lucchi A, Giannotti P, Cuzzupoli G, Girardi J, Conti B. Semiochemicals for intraspecific communication of the fig weevil Aclees sp. cf. foveatus (Coleoptera: Curculionidae): a first survey. Sci Rep 2020; 10:1092. [PMID: 31974464 PMCID: PMC6978528 DOI: 10.1038/s41598-020-58004-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 01/07/2020] [Indexed: 12/02/2022] Open
Abstract
The fig tree weevil Aclees sp. cf. foveatus (Coleoptera: Curculionidae), introduced in Italy in 2005, is currently causing significant economic and environmental losses to fig tree nurseries and orchards in Central Italy. Fig damages are due to the adults feeding on leaves and fruits, and to the galleries dug by the xylophagous larvae in the trunk, which lead the plants to death. To date, no chemical or biological control methods resulted to be effective against this invasive pest. In order to gain information about possible semiochemicals involved in mate recognition and choice, both the volatile organic compounds (VOCs) and the epicuticular lipids of male and female specimens were analysed. VOCs emissions of specimens were characterized essentially by monoterpenes, while epicuticular lipids contained long chained 2-ketones, alkanes, alkenes, including some methyl alkenes, and several fatty acid propyl esters. The attractiveness of reconstituted VOCs blends of the two sexes was tested in electrophysiological and behavioural assays in laboratory conditions. Both the male and the female reconstituted VOCs drove a significant response towards individuals of the opposite sex, thus demonstrating features of sexual attractants. Our results suggest a possible application of VOCs blends as pheromonic attractants in field monitoring and mass trapping of Aclees sp. cf. foveatus.
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Affiliation(s)
- Immacolata Iovinella
- Department of Biology, University of Florence, Via Madonna del Piano 6, 50019, Sesto Fiorentino, Italy
| | - Erika Carla Pierattini
- Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56126, Pisa, Italy
| | - Stefano Bedini
- Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56126, Pisa, Italy.
| | - Francesca Romana Dani
- Department of Biology, University of Florence, Via Madonna del Piano 6, 50019, Sesto Fiorentino, Italy
| | - Salvatore Guarino
- Institute of Biosciences and Bioresources (IBBR), National Research Council of Italy (CNR), Corso Calatafimi 414, 90129, Palermo, Italy
| | - Andrea Lucchi
- Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56126, Pisa, Italy
| | - Paolo Giannotti
- Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56126, Pisa, Italy
| | - Giorgio Cuzzupoli
- Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56126, Pisa, Italy
| | - Jessica Girardi
- Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56126, Pisa, Italy
| | - Barbara Conti
- Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56126, Pisa, Italy
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Sarabia LE, López MF, Obregón-Molina G, Cano-Ramírez C, Sánchez-Martínez G, Zúñiga G. The Differential Expression of Mevalonate Pathway Genes in the Gut of the Bark Beetle Dendroctonus rhizophagus (Curculionidae: Scolytinae) Is Unrelated to the de Novo Synthesis of Terpenoid Pheromones. Int J Mol Sci 2019; 20:E4011. [PMID: 31426479 PMCID: PMC6721070 DOI: 10.3390/ijms20164011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 07/03/2019] [Accepted: 07/03/2019] [Indexed: 12/11/2022] Open
Abstract
Bark beetles commonly produce de novo terpenoid pheromones using precursors synthesized through the mevalonate pathway. This process is regulated by Juvenile Hormone III (JH III). In this work, the expression levels of mevalonate pathway genes were quantified after phloem feeding-to induce the endogenous synthesis of JH III-and after the topical application of a JH III solution. The mevalonate pathway genes from D. rhizophagus were cloned, molecularly characterized, and their expression levels were quantified. Also, the terpenoid compounds produced in the gut were identified and quantified by Gas Chromatography Mass Spectrometry (GC-MS). The feeding treatment produced an evident upregulation, mainly in acetoacetyl-CoA thiolase (AACT), 3-hydroxy-3-methylglutaryl-CoA synthase (HMGS), 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR), phosphomevalonate kinase (PMK), and isopentenyl diphosphate isomerase (IPPI) genes, and males reached higher expression levels compared to females. In contrast, the JH III treatment did not present a clear pattern of upregulation in any sex or time. Notably, the genes responsible for the synthesis of frontalin and ipsdienol precursors (geranyl diphosphate synthase/farnesyl diphosphate synthase (GPPS/FPPS) and geranylgeranyl diphosphate synthase (GGPPS)) were not clearly upregulated, nor were these compounds further identified. Furthermore, trans-verbenol and myrtenol were the most abundant compounds in the gut, which are derived from an α-pinene transformation rather than de novo synthesis. Hence, the expression of mevalonate pathway genes in D. rhizophagus gut is not directed to the production of terpenoid pheromones, regardless of their frequent occurrence in the genus Dendroctonus.
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Affiliation(s)
- Laura Elisa Sarabia
- Laboratorio de Variación Biológica y Evolución, Departamento de Zoología, Escuela, Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Miguel Hidalgo, Mexico City CP 11340, Mexico
| | - María Fernanda López
- Laboratorio de Variación Biológica y Evolución, Departamento de Zoología, Escuela, Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Miguel Hidalgo, Mexico City CP 11340, Mexico
| | - Gabriel Obregón-Molina
- Laboratorio de Variación Biológica y Evolución, Departamento de Zoología, Escuela, Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Miguel Hidalgo, Mexico City CP 11340, Mexico
| | - Claudia Cano-Ramírez
- Laboratorio de Variación Biológica y Evolución, Departamento de Zoología, Escuela, Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Miguel Hidalgo, Mexico City CP 11340, Mexico
| | - Guillermo Sánchez-Martínez
- Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Campo Experimental Pabellón, Km. 32.5 Carr. Ags.-Zac., Pabellón de Arteaga, Ags. CP 20660, Mexico
| | - Gerardo Zúñiga
- Laboratorio de Variación Biológica y Evolución, Departamento de Zoología, Escuela, Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Miguel Hidalgo, Mexico City CP 11340, Mexico.
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17
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Sarabia LE, López MF, Pineda-Mendoza RM, Obregón-Molina G, Gonzalez-Escobedo R, Albores-Medina A, Zúñiga G. Time-Course of CYP450 Genes Expression From Dendroctonus rhizophagus (Curculionidae: Scolytinae) During Early Hours of Drilling Bark and Settling Into the Host Tree. J Insect Sci 2019; 19:5494808. [PMID: 31115475 PMCID: PMC6529903 DOI: 10.1093/jisesa/iez046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Indexed: 06/09/2023]
Abstract
Dendroctonus bark beetles (Scolytinae) are one of the most important disturbance agents of coniferous forests in North and Central America. These beetles spend their lives almost entirely under the tree bark, and their survival and reproductive success depend on their ability to overcome the toxic effect of the trees' oleoresin. The cytochromes P450 (CYPs) are associated with the detoxification process of xenobiotics, as well as other physiological processes. Different cytochromes (families 4, 6, and 9) in the Dendroctonus species have been expressed under several experimental conditions; nevertheless, the expression time-course of these genes is unknown. To explore the induction speed of CYPs, we evaluated the relative expression of the CYP6BW5, CYP6DG1, CYP6DJ2, CYP9Z18, and CYP9Z20 genes at the early hours of drilling and settling into a tree (1, 2, 4, 6, 8, 12, 18 h) both in females and males, solitary or paired, of the bark beetle Dendroctonus rhizophagus Thomas and Bright. Our findings show that the five genes were rapidly overexpressed in the early hours (1 to 6 h) in both sexes and in solitary and paired conditions, suggesting their participation in the detoxification process. Additionally, the CYPs expression shows up- and down-regulation patterns through these short times, suggesting their probable participation in other physiological processes as the biosynthesis of hormones, pheromones or compounds related to reproduction.
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Affiliation(s)
- Laura E Sarabia
- Laboratorio de Variación Biológica y Evolución, Departamento de Zoología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Miguel Hidalgo, Mexico City, Mexico
| | - María F López
- Laboratorio de Variación Biológica y Evolución, Departamento de Zoología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Miguel Hidalgo, Mexico City, Mexico
| | - Rosa M Pineda-Mendoza
- Laboratorio de Variación Biológica y Evolución, Departamento de Zoología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Miguel Hidalgo, Mexico City, Mexico
| | - Gabriel Obregón-Molina
- Laboratorio de Variación Biológica y Evolución, Departamento de Zoología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Miguel Hidalgo, Mexico City, Mexico
| | - Roman Gonzalez-Escobedo
- Laboratorio de Variación Biológica y Evolución, Departamento de Zoología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Miguel Hidalgo, Mexico City, Mexico
| | - Arnulfo Albores-Medina
- Departamento de Toxicología, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional 2508, San Pedro Zacatenco, Gustavo A. Madero, Mexico City, Mexico
| | - Gerardo Zúñiga
- Laboratorio de Variación Biológica y Evolución, Departamento de Zoología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Miguel Hidalgo, Mexico City, Mexico
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Chiu CC, Keeling CI, Bohlmann J. Cytochromes P450 Preferentially Expressed in Antennae of the Mountain Pine Beetle. J Chem Ecol 2019; 45:178-86. [DOI: 10.1007/s10886-018-0999-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 05/25/2018] [Accepted: 07/18/2018] [Indexed: 01/14/2023]
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Haynes KF. Editorial overview: Insect pheromones: making sense of a rapidly diversifying field of study. Curr Opin Insect Sci 2017; 24:vii-ix. [PMID: 29208232 DOI: 10.1016/j.cois.2017.11.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Affiliation(s)
- Kenneth F Haynes
- Department of Entomology, University of Kentucky, Lexington, KY 40546, USA.
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