Search results for: YangChun Han

Items from 1 to 7 out of 7 results

article

Research on landslide hazard assessment in data‑deficient areas: a case study of Tumen City, China

Xia Li, Jiulong Cheng, Dehao Yu, Yangchun Han

Acta Geophysica > 2023 > Vol. 71, no. 4 > 1763--1774

With the development of economy, the urbanization process is accelerated and the infrastructure construction is increased, which leads to the widespread occurrence of landslides in mountain areas all over the world. However, due to the complex geological environment or some other reasons, the lack of landslide-related data in some mountainous areas makes it more difficult to predict landslides. At...

article

Induced expression of small heat shock proteins is associated with thermotolerance in female Laodelphax striatellus planthoppers

Lihua Wang, Yueliang Zhang, Lei Pan, Qin Wang, more

Cell Stress and Chaperones > 2019 > 24 > 1 > 115-123

Insects are often exposed to high temperature stress in natural environments, but the mechanisms involved in thermotolerance in many insect groups like Hemiptera are not well known. To explore possible mechanisms of thermotolerance in the hemipteran pest Laodelphax striatellus, which damages rice through direct feeding and viral transmission, small heat shock proteins (sHsps) implicated in thermotolerance...

article

Resistance to cycloxaprid in Laodelphax striatellus is associated with altered expression of nicotinic acetylcholine receptor subunits

Yueliang Zhang, Yangchun Han, Qiong Yang, Lihua Wang, more

Pest Management Science > 74 > 4 > 837 - 843

BACKGROUND Cycloxaprid is a new oxabridged cis‐configuration neonicotinoid insecticide, the resistance development potential and underlying resistance mechanism of which were investigated in the small brown planthopper, Laodelphax striatellus (Fallén), an important agricultural pest of rice. RESULTS A cycloxaprid‐resistant strain (YN‐CPD) only achieved 10‐fold higher resistance, in contrast to 106‐fold...

article

Variation in P450-mediated fenvalerate resistance levels is not correlated with CYP337B3 genotype in Chinese populations of Helicoverpa armigera

Yangchun Han, Wanting Yu, Weiqing Zhang, Yihua Yang, more

Pesticide Biochemistry and Physiology > 2015 > 121 > C > 129-135

Metabolic resistance to synthetic pyrethroids in Helicoverpa armigera has recently been associated with the chimeric cytochrome P450 enyzme CYP337B3. One variant of the latter, CYP337B3v1, accounts for 40–50 fold resistance to fenvalerate in an Australian population while a second variant, CYP337B3v2, has been associated with ~7 fold resistance to cypermethrin in a Pakistani population. Here we...

article

How many genetic options for evolving insecticide resistance in heliothine and spodopteran pests?

John G Oakeshott, Claire A Farnsworth, Peter D East, Colin Scott, more

Pest Management Science > 69 > 8 > 889 - 896

The widely accepted paradigm for the development of insecticide resistance in field populations of insects is of selection for one or a very few genes of major effect. Limited genetic mapping data for organophosphate and pyrethroid resistance in heliothine and spodopteran pests generally agrees with this paradigm. However, other biochemical and transcriptomic data suggest a more complex set of changes in multiple P450 and esterase gene/enzyme systems in resistant strains of these species. We discuss possible explanations for this paradox, including the likely embedding of these genes in regulatory cascades and emerging evidence for their arrangement in large clusters of closely related genes. We conclude that there could indeed be an unusually large number of genetic options for evolving resistance in these species. © 2013 Society of Chemical Industry

article

Proteomic and molecular analyses of esterases associated with monocrotophos resistance in Helicoverpa armigera

Yangchun Han, Shuwen Wu, Yapeng Li, Jian-Wei Liu, more

Pesticide Biochemistry and Physiology > 2012 > 104 > 3 > 243-251

We have obtained a Helicoverpa armigera strain (MonoR) showing high level resistance to monocrotophos by 15 generations of selection on a weakly resistant field-caught strain. Bioassays using various synergists show a major role for esterases in the resistance, and little if any role for cytochrome P450s or glutathione S-transferases. Biochemical data also show elevated levels of esterase activity...

article

Identification of an avirulence gene, avrxa5, from the rice pathogen Xanthomonas oryzae pv. oryzae

HuaSong Zou, WenXiang Zhao, XiFu Zhang, YangChun Han, more

Science China Life Sciences > 2010 > 53 > 12 > 1440-1449

Xanthomonas oryzae pv. oryzae, the causal agent of bacterial blight in rice, interacts with rice plants in a gene-for-gene manner. The specificity of the interaction is dictated by avirulence (avr) genes in the pathogen and resistance (R) genes in the host. To date, no avr genes that correspond to recessive R genes have been isolated. We isolated an avrBs3/pthA family gene, avrxa5, from...

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Search results for: YangChun Han

Research on landslide hazard assessment in data‑deficient areas: a case study of Tumen City, China

Induced expression of small heat shock proteins is associated with thermotolerance in female Laodelphax striatellus planthoppers

Resistance to cycloxaprid in Laodelphax striatellus is associated with altered expression of nicotinic acetylcholine receptor subunits

Variation in P450-mediated fenvalerate resistance levels is not correlated with CYP337B3 genotype in Chinese populations of Helicoverpa armigera

How many genetic options for evolving insecticide resistance in heliothine and spodopteran pests?

Proteomic and molecular analyses of esterases associated with monocrotophos resistance in Helicoverpa armigera

Identification of an avirulence gene, avrxa5, from the rice pathogen Xanthomonas oryzae pv. oryzae

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