Tebufenozide resistance selected inPlutella xylostella and its cross-resistance and fitness cost

2006 ◽  
Vol 62 (8) ◽  
pp. 746-751 ◽  
Author(s):  
Guangchun Cao ◽  
Zhaojun Han
Keyword(s):  
Fitness Cost ◽  
Cross Resistance

scholarly journals Characterization of resistance and fitness cost of Descurainia sophia L. populations from Henan and Xinjiang, China

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dongzhi Li ◽  
Lanfen Xie ◽  
Pei Zhang ◽  
Runqiang Liu ◽  
Mingwang Shi ◽  
...  
Keyword(s):  
Fitness Cost ◽  
Cross Resistance ◽  
Homozygous Mutation ◽  
Susceptible Population ◽  
Relative Growth Rates ◽  
Wheat Field ◽  
Production Region ◽  
Descurainia Sophia ◽  
Mutation Type ◽  
Tribenuron Methyl

AbstractDescurainia sophia L. is a notorious weed in winter wheat field and has serious resistance to tribenuron-methyl. Xinjiang is a main wheat production region in China with no information on D. sophia resistance to tribenuron-methyl. Here, resistance levels of D. sophia populations to tribenuron-methyl from Xinjiang and Henan were investigated. In addition, homozygous mutation subpopulations of high resistant D. sophia populations from Xinjiang and Henan were generated and then cross-resistance and fitness cost were determined. Results showed that 5 out of 31 populations from Xinjiang developed resistance to tribenuron-methyl, including two high resistant populations (X30 and X31). While 10 out of 11 populations from Henan showed resistance to tribenuron-methyl, including three high resistant populations (H5, H6 and H7). X30 and X31 shared the same mutation type of Pro197Thr in ALS1, while the mutation type of ALS1 in H5, H6 and H7 were Pro197Ser, Pro197His and Pro197Ala, respectively. The homozygous mutation subpopulations (SX30, SX31, SH5, SH6, SH7) showed cross-resistance to flucarbazone-sodium, bensulfuron methyl and flumetsulam. Under monoculture condition, relative growth rates of SX30, SX31 were higher than susceptible population (SX13), while that in SH5, SH6, SH7 were almost same with SX13. When mix planted with SX13, SX30 and SX31 displayed weaker competitiveness than SX13, while SH5, SH6, SH7 showed stronger competitiveness than SX13. The results suggested that D. sophia from Xinjiang had low resistance frequency to tribenuron-methyl and the high resistant populations had fitness costs.

Characterization of indoxacarb resistance in Phenacoccus solenopsis Tinsley (Homoptera: Pseudococcidae): Cross-resistance, stability and fitness cost

2015 ◽  
Vol 18 (4) ◽  
pp. 779-785 ◽  
Author(s):  
Muhammad Babar Shahzad Afzal ◽  
Sarfraz Ali Shad ◽  
Esteban Basoalto ◽  
Masood Ejaz ◽  
Jose Eduardo Serrao
Keyword(s):  
Fitness Cost ◽  
Cross Resistance ◽  
Phenacoccus Solenopsis ◽  
Resistance Stability

Cross-resistance, stability, and fitness cost of resistance to imidacloprid in Musca domestica L., (Diptera: Muscidae)

2014 ◽  
Vol 114 (1) ◽  
pp. 247-255 ◽  
Author(s):  
Naeem Abbas ◽  
Hussnain Khan ◽  
Sarfraz Ali Shad
Keyword(s):  
Musca Domestica ◽  
Fitness Cost ◽  
Cross Resistance ◽  
Cost Of Resistance ◽  
Resistance Stability

Mechanisms and phenotypic consequences of acquisition of tigecycline resistance by Stenotrophomonas maltophilia

2019 ◽  
Vol 74 (11) ◽  
pp. 3221-3230 ◽  
Author(s):  
Paula Blanco ◽  
Fernando Corona ◽  
José Luis Martinez
Keyword(s):  
Stenotrophomonas Maltophilia ◽  
Efflux Pump ◽  
Maximum Growth ◽  
Opportunistic Pathogen ◽  
Resistance Mechanisms ◽  
Fitness Cost ◽  
Negative Regulator ◽  
Cross Resistance ◽  
Bacterial Fitness ◽  
High Level

Abstract Objectives To elucidate the potential mutation-driven mechanisms involved in the acquisition of tigecycline resistance by the opportunistic pathogen Stenotrophomonas maltophilia. The mutational trajectories and their effects on bacterial fitness, as well as cross-resistance and/or collateral susceptibility to other antibiotics, were also addressed. Methods S. maltophilia populations were submitted to experimental evolution in the presence of increasing concentrations of tigecycline for 30 days. The genetic mechanisms involved in the acquisition of tigecycline resistance were determined by WGS. Resistance was evaluated by performing MIC assays. Fitness of the evolved populations and individual clones was assessed by measurement of the maximum growth rates. Results All the tigecycline-evolved populations attained high-level resistance to tigecycline following different mutational trajectories, yet with some common elements. Among the mechanisms involved in low susceptibility to tigecycline, mutations in the SmeDEF efflux pump negative regulator smeT, changes in proteins involved in the biogenesis of the ribosome and modifications in the LPS biosynthesis pathway seem to play a major role. Besides tigecycline resistance, the evolved populations presented cross-resistance to other antibiotics, such as aztreonam and quinolones, and they were hypersusceptible to fosfomycin, suggesting a possible combination treatment. Further, we found that the selected resistance mechanisms impose a relevant fitness cost when bacteria grow in the absence of antibiotic. Conclusions Mutational resistance to tigecycline was easily selected during exposure to this antibiotic. However, the fitness cost may compromise the maintenance of S. maltophilia tigecycline-resistant populations in the absence of antibiotic.

Cross-resistance and Fitness Cost Analysis of Resistance to Thiamethoxam in Melon and Cotton Aphid (Hemiptera: Aphididae)

2020 ◽  
Vol 113 (4) ◽  
pp. 1946-1954 ◽  
Author(s):  
Huihui Zhang ◽  
Anqi Chen ◽  
Tisheng Shan ◽  
Wenyang Dong ◽  
Xueyan Shi ◽  
...  
Keyword(s):  
Juvenile Hormone ◽  
Resistant Strain ◽  
Fitness Cost ◽  
Relative Fitness ◽  
Cross Resistance ◽  
Resistance Pattern ◽  
Continuous Exposure ◽  
Cotton Aphid ◽  
Developmental Duration ◽  
The Cross

Abstract The melon/cotton aphid, Aphis gossypii Glover, is a notorious pest in many crops. The neonicotinoid insecticide thiamethoxam is widely used for A. gossypii control. To evaluate thiamethoxam resistance risk, a melon/cotton aphid strain with an extremely high level of resistance to thiamethoxam (>2,325.6-fold) was established after selection with thiamethoxam for 24 generations. Additionally, the cross-resistance pattern to other neonicotinoids and fitness were analyzed. The cross-resistance results showed the thiamethoxam-resistant strain had extremely high levels of cross-resistance against clothianidin (>311.7-fold) and nitenpyram (299.9-fold), high levels of cross-resistance against dinotefuran (142.3-fold) and acetamiprid (76.6-fold), and low cross-resistance against imidacloprid (9.3-fold). Compared with the life table of susceptible strain, the thiamethoxam-resistant strain had a relative fitness of 0.950, with significant decreases in oviposition days and fecundity and prolonged developmental duration. The molecular mechanism for fitness costs was studied by comparing the mRNA expression levels of juvenile hormone acid O-methyltransferase (JHAMT), juvenile hormone-binding protein (JHBP), juvenile hormone epoxide hydrolase (JHEH), ecdysone receptor (EcR), ultraspiracle protein (USP), and Vitellogenin (Vg) in the susceptible and thiamethoxam-resistant strains. Significant overexpression of JHEH and JHBP and downregulation of EcR and Vg expression were found in the thiamethoxam-resistant strain. These results indicate that A. gossypii has the potential to develop extremely high resistance to thiamethoxam after continuous exposure, with a considerable fitness cost and cross-resistance to other neonicotinoids.

Deltamethrin resistance in the cotton mealybug, Phenacoccus solenopsis Tinsley: Cross-resistance to other insecticides, fitness cost analysis and realized heritability

2015 ◽  
Vol 44 (1) ◽  
pp. 83-90 ◽  
Author(s):  
Bushra Saddiq ◽  
Naeem Abbas ◽  
Sarfraz Ali Shad ◽  
Muhammad Aslam ◽  
Muhammad Babar Shahzad Afzal
Keyword(s):  
Cost Analysis ◽  
Fitness Cost ◽  
Cross Resistance ◽  
Realized Heritability ◽  
Phenacoccus Solenopsis ◽  
Deltamethrin Resistance ◽  
Cotton Mealybug
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