Long-term virulence monitoring of differential cultivars in Japan's immigrant populations of Nilaparvata lugens (Hemiptera: Delphacidae) in 2001–2019

Author(s):  
Tomohisa Fujii ◽  
Kazuhiro Yoshida ◽  
Tetsuya Kobayashi ◽  
Khin Khin Marlar Myint ◽  
Hideshi Yasui ◽  
...  
2018 ◽  
Vol 37 (6) ◽  
pp. 1053-1077 ◽  
Author(s):  
James Raymer ◽  
Bernard Baffour

Abstract Australia is a major immigration country and immigrants currently represent around 28% of the total population. The aim of this research is to understand the long-term consequences of this immigration and, particularly, how migrants respond to opportunities within the country after arriving through the process of subsequent (internal) migration. The focus is on major immigrant groups in Australia, including persons born in the United Kingdom, New Zealand, China and India, and how their patterns differ from persons born in Australia. To conduct this analysis, we have gathered data for a 35-year period based on quinquennial census data. We also obtained birthplace-specific mortality data for constructing multiregional life tables for the immigrant populations. Subsequent migration is important for understanding population redistribution, and the relative attractiveness of destinations within host countries. Our results highlight the importance of subsequent migration and the diversity of migration behaviours amongst different immigrant groups in the context of overall declines in internal migration since 1981.


Agronomy ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2327
Author(s):  
Xiaorong Xu ◽  
Liang Chen ◽  
Hantao Zhou ◽  
Ming Tang

The prevention and control of planthoppers represent important issues for rice production. Current long-term control methods rely on pesticides, which raise concerns about environmental pollution. Recently, evidence has suggested that bacterial symbionts are important factors influencing the formation of Hemiptera insect biotypes and the selection of host plants for insects, which suggesting that targeting bacterial communities may be an effective alternative method for planthopper control. In this study, we perturbed the bacterial communities of the brown planthopper, Nilaparvata lugens, by feeding antibiotic-treated rice and used RNA-seq to examine the transcriptome of normal rice fed with perturbed BPHs by RNA-seq. Our results showed that the composition of the bacterial communities significantly changed after the perturbation, which was accompanied by changes in distinct biological processes of rice, especially the phenylpropanoid biosynthesis pathway, compared with the effect of the BPH feeding on rice without bacterial communities perturbation. Our work establishes a protocol for bacterial communities perturbation in BPH, demonstrating the link between bacterial community and the responses to BPH feeding and providing new insights into the interaction between BPH and rice.


Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4116 ◽  
Author(s):  
Yafeng Tian ◽  
Ya Gao ◽  
Yanming Chen ◽  
Genyan Liu ◽  
Xiulian Ju

Fipronil, as the first commercialized member of phenylpyrazole insecticides, has been widely used to control planthoppers in China due to its high insecticidal activity and low toxicity to mammals. However, insects have developed resistance to phenylpyrazoles after their long-term use. The resistance mechanism of insects to fipronil has not been well identified, which limited the development of phenylpyrazole insecticides. In the present study, we aimed to elucidate the related fipronil-resistance mechanism in N. lugens GABA receptors by homology modeling, molecular docking, and molecular dynamics. The results indicated that fipronil showed the weakest interaction with the mutant (R0′Q + A2′S) GABA receptors, which is consistent with the experimental study. The binding poses of fipronil were found to be changed when mutations were conducted. These findings verified the novel fipronil-resistance mechanism in silico and provide important information for the design of novel GABAR-targeting insecticides.


2020 ◽  
Vol 44 (4) ◽  
pp. 667-696
Author(s):  
Steven Sprick Schuster ◽  
Matthew Jaremski ◽  
Elisabeth Ruth Perlman

AbstractSeeking to reach the unbanked, the US Postal Savings System provided a federally insured savings alternative to traditional banks. Using novel data sets on postal deposits, demographic characteristics, and banks, we study how and by whom the system was used. We find the program was initially used by nonfarming immigrant populations for short-term saving, then as a safe haven during the Great Depression, and finally as long-term investments for the wealthy during the 1940s. Postal Savings was only a partial substitute for traditional banks, as locations with banks often still heavily used Postal Savings.


2017 ◽  
Vol 76 (1) ◽  
pp. 29-36 ◽  
Author(s):  
Jarosław Przetakiewicz

Abstract Plant Breeding and Acclimatization Institute - National Research Institute (IHAR-PIB) is responsible for pathotype identification of Synchytrium endobioticum isolates collecting from Poland. Pathogenicity tests are carried out using the Glynne-Lemmerzahl method, according to EPPO Standard PM 7/28. Pathotypes are defined based on their reaction to a range of well-characterized differential cultivars of potato. Assessment of one isolate of the fungus requires more than 20 differential cultivars. All pathotypes of S. endobioticum from Polish reference collection are multiplied and maintained (fresh warts) on tubers of extremely susceptible cultivars continuously. For all references pathotypes and isolates of S. endobioticum, the compost with winter sporangia are prepared for long-term of maintenance.


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