The role of 20E biosynthesis relative gene Shadow in the reproduction of the predatory mirid bug, Cyrtorhinus lividipennis (Hemiptera: Miridae)

2021 ◽  
Author(s):  
Kui Hu ◽  
Baobao Fu ◽  
Chuchu Wang ◽  
Jianqi Liu ◽  
Yingying Tang ◽  
...  
Keyword(s):  
Cyrtorhinus Lividipennis ◽  
Mirid Bug ◽  
Predatory Mirid ◽  
Relative Gene

scholarly journals The Amino Acid-Mediated TOR Pathway Regulates Reproductive Potential and Population Growth in Cyrtorhinus lividipennis Reuter (Hemiptera: Miridae)

2020 ◽  
Vol 11 ◽  
Author(s):  
Haowen Zhu ◽  
Sui Zheng ◽  
Jinming Xu ◽  
Qing Wu ◽  
Qisheng Song ◽  
...  
Keyword(s):  
Population Growth ◽  
Regulatory Mechanism ◽  
Brown Planthopper ◽  
Reproductive Potential ◽  
Tor Pathway ◽  
Cyrtorhinus Lividipennis ◽  
Mirid Bug ◽  
Predatory Mirid ◽  
Predatory Capacity ◽  
Gramineous Species

The predatory mirid bug, Cyrtorhinus lividipennis Reuter, feeds on brown planthopper (BPH) eggs that are deposited on rice and gramineous plants surrounding rice fields. The development and reproduction of C. lividipennis are inhibited by feeding on BPH eggs from gramineous species, and the underlining regulatory mechanism for this phenomenon is unclear. In the present study, HPLC-MS/MS analysis revealed that the concentrations of six amino acids (AAs:Ala, Arg, Ser, Lys, Thr, and Pro) were significantly higher in rice than in five gramineous species. When C. lividipennis fed on gramineous plants with BPH eggs, expression of several genes in the target of rapamycin (TOR) pathway (Rheb, TOR, and S6K) were significantly lower than that in the insects fed on rice plants with BPH eggs. Treatment of C. lividipennis females with rapamycin, dsRheb, dsTOR, or dsS6K caused a decrease in Rheb, TOR, and S6K expression, and these effects were partially rescued by the juvenile hormone (JH) analog, methoprene. Dietary dsTOR treatment significantly influenced a number of physiological parameters and resulted in impaired predatory capacity, fecundity, and population growth. This study indicates that these six AAs play an important role in the mediated-TOR pathway, which in turn regulates vitellogenin (Vg) synthesis, reproduction, and population growth in C. lividipennis.

Implications of using two natural enemies of Tuta absoluta (Lepidoptera: Gelechiidae) toward tomato yield enhancement

2019 ◽  
Vol 109 (05) ◽  
pp. 617-625
Author(s):  
M.A. Mirhosseini ◽  
Y. Fathipour ◽  
M. Soufbaf ◽  
G.V.P. Reddy
Keyword(s):  
Total Yield ◽  
Egg Parasitoid ◽  
Tuta Absoluta ◽  
Yield Enhancement ◽  
Leaf Miner ◽  
Trichogramma Brassicae ◽  
Tomato Yield ◽  
Nesidiocoris Tenuis ◽  
Mirid Bug ◽  
Predatory Mirid

AbstractTomato leaf miner (TLM), Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) is one of the most destructive tomato pests worldwide. We tested quantity and quality of tomato fruits after simultaneous use of two biological control agents, the predatory mirid bug Nesidiocoris tenuis (Reuter) and the egg parasitoid Trichogramma brassicae Bezdenko against TLM. We varied the timing of predator releases (before or after pest establishment) and the number of parasitoids released (ten or 30 females per week per m2). The highest number of fruits per cage, percentage of undamaged fruits, total yield weight, and undamaged yield weight were all obtained with predator-in-first treatments, with or without parasitoid releases. Furthermore, measures of fruit quality were also highest in predator-in-first treatments, including, highest percentage of water, greatest proportional fresh weight of carbohydrates, most lycopene, most β-carotene, most flavonoids, and highest total chlorophyll. Thus, our findings support a predator-in-first augmentation approach for management of TLM.

scholarly journals The Rice NRT2.4 Alters Metabolism and Nitrogen Uptake through Root Modulation

2021 ◽  
Author(s):  
Andressa Fabiane Faria de Souza ◽  
Carlos Alberto Bucher ◽  
Leilson Novaes Arruda ◽  
Rafael Passos Rangel ◽  
Leandro Azevedo Santos ◽  
...  
Keyword(s):  
Root Growth ◽  
Expression Patterns ◽  
Pcr Analysis ◽  
Nitrate Transport ◽  
Expression Of Genes ◽  
Nitrate Supply ◽  
Mutant Lines ◽  
Relative Gene ◽  
Relative Gene Expression Level

Abstract Purpose The expression patterns of the NRT2 genes have been well described, however, it is not well known the role of OsNRT2.4 in root growth. In this study we thus aimed at investigating the role of high-affinity NO3- transport OsNRT2.4 in NO3--regulated and the modulation of root growth.Methods Through the gene silencing technique amiRNA-mediated we successfully obtained osnrt2.4 knockdown lines to study the role of OsNRT2.4 on root growth under low nitrate conditions. We performed real time RT-PCR analysis to investigate the relative gene expression level in root and shoot, soluble metabolites, and measurement of root system.Results Knockdown of OsNRT2.4 did not affect rice growth. In comparison with wild-type (WT) plants showed that knockdown of OsNRT2.4 inhibited root formation under low NO3- supply. We demonstrated that the mutant lines had significantly increased NO3- uptake than WT plants when growth in different nitrate supply; osnrt2.4 knockdown lines showed an alteration in nitrogen metabolism, and this affected the root growth. The downregulation of OsNRT2.4 enhanced the expression of genes response of low external NO3- concentrations.Conclusion Herein we provide new insights in OsNRT2.4 functions. Our data demonstrated that OsNRT2.4 plays a role in root growth, nitrogen metabolic pathway and probably have functions in nitrate transport from root to shoot under low nitrate availability in rice.

scholarly journals Side effects of vegetable pesticides on a predatory mirid bug, Pilophorus typicus Distant (Heteroptera: Miridae)

2010 ◽  
Vol 45 (2) ◽  
pp. 239-243 ◽  
Author(s):  
Kengo Nakahira ◽  
Ryoya Kashitani ◽  
Masafumi Tomoda ◽  
Rika Kodama ◽  
Katsura Ito ◽  
...  
Keyword(s):  
Side Effects ◽  
Mirid Bug ◽  
Predatory Mirid

scholarly journals Predation of apple leafcurling midge Dasineura mali by Sejanus albisignata

2012 ◽  
Vol 65 ◽  
pp. 49-53 ◽  
Author(s):  
P.W. Shaw ◽  
D.R. Wallis
Keyword(s):  
Field Experiment ◽  
Laboratory Experiment ◽  
Quantitative Data ◽  
Effective Predator ◽  
Mirid Bug ◽  
Predatory Mirid ◽  
Dasineura Mali

The predatory mirid bug Sejanus albisignata has been observed feeding on apple leafcurling midge (ALCM) eggs but quantitative data on its potential as a predator of ALCM are lacking Two methods were trialled to assess predation of ALCM by S albisignata In a laboratory experiment apple shoots infested with freshly laid ALCM eggs were contained with and without a S albisignata adult and in a field experiment paper bags were secured over shoots with ALCM eggs and individual S albisignata nymphs were introduced into half of these There were significant reductions of surviving midge larvae on shoots confined with adult predators and reduced numbers of midgeinfested leaves and larvae on bagged shoots with S albisignata nymphs Results from these nonchoice trials indicate that S albisignata can be an effective predator of ALCM More detailed feeding studies would determine if adult and immature S albisignata have a preference for midge eggs or larvae

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