Nanosilicon enhances maize resistance against oriental armyworm (Mythimna separata) by activating the biosynthesis of chemical defenses

2021 ◽  
Vol 778 ◽  
pp. 146378
Author(s):  
Zhenyu Wang ◽  
Wenqing Zhu ◽  
Feiran Chen ◽  
Le Yue ◽  
Ying Ding ◽  
...  
Keyword(s):  
Chemical Defenses ◽  
Mythimna Separata ◽  
Maize Resistance ◽  
Oriental Armyworm

Transcriptional identification of differentially expressed genes during the prepupal–pupal transition in the oriental armyworm, Mythimna separata (Walker) (Lepidoptera: Noctuidae)

2021 ◽  
pp. 1-14
Author(s):  
Peirong Li ◽  
Xinru Li ◽  
Wei Wang ◽  
Xiaoling Tan ◽  
Xiaoqi Wang ◽  
...  
Keyword(s):  
Differentially Expressed Genes ◽  
Metabolic Pathways ◽  
Developmental Stages ◽  
Kegg Pathway ◽  
Enrichment Analysis ◽  
Differentially Expressed ◽  
Mythimna Separata ◽  
Kegg Pathway Analysis ◽  
Oriental Armyworm ◽  
Lepidoptera Noctuidae

Abstract The oriental armyworm, Mythimna separata (Walker) is a serious pest of agriculture that does particular damage to Gramineae crops in Asia, Europe, and Oceania. Metamorphosis is a key developmental stage in insects, although the genes underlying the metamorphic transition in M. separata remain largely unknown. Here, we sequenced the transcriptomes of five stages; mature larvae (ML), wandering (W), and pupation (1, 5, and 10 days after pupation, designated P1, P5, and P10) to identify transition-associated genes. Four libraries were generated, with 22,884, 23,534, 26,643, and 33,238 differentially expressed genes (DEGs) for the ML-vs-W, W-vs-P1, P1-vs-P5, and P5-vs-P10, respectively. Gene ontology enrichment analysis of DEGs showed that genes regulating the biosynthesis of the membrane and integral components of the membrane, which includes the cuticular protein (CP), 20-hydroxyecdysone (20E), and juvenile hormone (JH) biosynthesis, were enriched. Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis indicated that DEGs were enriched in the metabolic pathways. Of these DEGs, thirty CP, seventeen 20E, and seven JH genes were differentially expressed across the developmental stages. For transcriptome validation, ten CP, 20E, and JH-related genes were selected and verified by real-time PCR quantitative. Collectively, our results provided a basis for further studies of the molecular mechanism of metamorphosis in M. separata.

scholarly journals Identification of 35 C-Type Lectins in the Oriental Armyworm, Mythimna separata (Walker)

Insects ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 559
Author(s):  
Hao Li ◽  
Fang-Fang Liu ◽  
Li-Qing Fu ◽  
Ze Liu ◽  
Wen-Ting Zhang ◽  
...  
Keyword(s):  
Fat Body ◽  
Early Stage ◽  
Average Length ◽  
Phylogenetic Analyses ◽  
Endocrine System ◽  
Economic Loss ◽  
Mythimna Separata ◽  
Oriental Armyworm ◽  
Potential Ligand ◽  
Cellular Immune

Insect C-type lectins (CTLs) play vital roles in modulating humoral and cellular immune responses. The oriental armyworm, Mythimna separata (Walker) (Lepidoptera: Noctuidae) is a migratory pest that causes significant economic loss in agriculture. CTLs have not yet been systematically identified in M. separata. In this study, we first constructed a transcriptome of M. separata larvae, generating a total of 45,888 unigenes with an average length of 910 bp. Unigenes were functionally annotated in six databases: NR, GO, KEGG, Pfam, eggNOG, and Swiss-Prot. Unigenes were enriched in functional pathways, such as those of signal transduction, endocrine system, cellular community, and immune system. Thirty-five unigenes encoding C-type lectins were identified, including CTL-S1~CTL-S6 (single CRD) and IML-1~IML-29 (dual CRD). Phylogenetic analyses showed dramatic lineage-specific expansions of IMLs. Sequence alignment and structural modeling identified potential ligand-interacting residues. Real-time qPCR revealed that CTL-Ss mainly express in eggs and early stage larvae, while IMLs mainly express in mid-late-stage larvae, pupae, and adults. In naïve larvae, hemocytes, fat body, and epidermis are the major tissues that express CTLs. In larvae challenged by Escherichia coli, Staphylococcus aureus, or Beauveria bassiana, the expression of different CTLs was stimulated in hemocytes, fat body and midgut. The present study will help further explore functions of M. separata CTLs.

Structure–function analysis of PGRP‐S1 from the oriental armyworm, Mythimna separata

2021 ◽  
Vol 106 (2) ◽  
Author(s):  
Fang‐Fang Liu ◽  
Hao Li ◽  
Pei‐Jin Yang ◽  
Xiang‐Jun Rao
Keyword(s):  
Structure Function ◽  
Function Analysis ◽  
Mythimna Separata ◽  
Oriental Armyworm

Molecular cloning, characterization and functional analysis of GluCl from the oriental armyworm, Mythimna separata Walker

2019 ◽  
Vol 156 ◽  
pp. 56-62 ◽  
Author(s):  
Jin-da Wang ◽  
Li-fei Chen ◽  
Dong-jiang Lin ◽  
Jia-song Zhang ◽  
Ji-han Zhao ◽  
...  
Keyword(s):  
Functional Analysis ◽  
Molecular Cloning ◽  
Mythimna Separata ◽  
Oriental Armyworm

scholarly journals Insecticide resistance of the field populations of oriental armyworm, Mythimna separata (Walker) in Shaanxi and Shanxi provinces of China

2018 ◽  
Vol 17 (7) ◽  
pp. 1556-1562 ◽  
Author(s):  
Yu-yu ZHAO ◽  
Li SU ◽  
Shuai LI ◽  
Yi-ping LI ◽  
Xiang-li XU ◽  
...  
Keyword(s):  
Insecticide Resistance ◽  
Mythimna Separata ◽  
Oriental Armyworm

Characterization and Expression of Genes Encoding Superoxide Dismutase in the Oriental Armyworm, Mythimna separata (Lepidoptera: Noctuidae)

2019 ◽  
Vol 112 (5) ◽  
pp. 2381-2388 ◽  
Author(s):  
Hong-Bo Li ◽  
Chang-Geng Dai ◽  
Yong-Fu He ◽  
Yang Hu
Keyword(s):  
Superoxide Dismutase ◽  
Population Density ◽  
Developmental Stages ◽  
Mythimna Separata ◽  
Expression Of Genes ◽  
Genes Encoding ◽  
Key Factor ◽  
Important Pest ◽  
Oriental Armyworm

Abstract Superoxide dismutase (SOD) is an antioxidant metalloenzyme that catalyzes the dismutation of the superoxide anion O2− to O2 and H2O2. Many studies have focused on the role of SOD in response to abiotic stress, but its role during biotic stress, such as changes in organismal population density, has rarely been investigated. The oriental armyworm, Mythimna separata, is an economically important pest that exhibits phenotypic changes in response to population density. Solitary and gregarious phases occur at low and high population density, respectively. To examine the role of SODs in response to population density stress, we cloned two genes encoding SOD, MsCuZnSOD and MsMnSOD, and compared their expression in solitary and gregarious phases of M. separata. The MsCuZnSOD and MsMnSOD ORFs were 480 and 651 bp and encoded predicted protein products of 159 and 216 amino acids, respectively. The two SODs contained motifs that are typical of orthologous proteins. Real-time PCR indicated that the two SOD genes were expressed throughout developmental stages and were significantly upregulated in more mature stages of gregarious M. separata. Expression of the two SOD genes in various tissues of sixth-instar larvae was higher in gregarious versus solitary insects. Furthermore, expression of the SOD genes was significantly upregulated in response to crowding in solitary individuals, but suppressed in gregarious insects subjected to isolation. Collectively, these results suggest that population density may be key factor in the induction of SOD genes in M. separata.

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