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- 저자 : Zhao-yun Lyu (검색결과 2 건)
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Genetic diversity and origin of Dendrothrips minowai (Thysanoptera: Thripidae) in Guizhou, China
Zhao-yun Lyu,Jun-rui Zhi,Yu-feng Zhou,Ze-hong Meng,Wen-bo Yue 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.4
In this study, we explored the population genetics of Dendrothrips minowai Priesner, one of themost destructive horticultural pests, in Guizhou Province of China. We have analyzed the data of mitochondrial cytochrome c oxidase subunit I (COI) gene sequences of D. minowai from 27 populations sampled over two years in Guizhou. The results confirmed that the thrips retained moderate levels of genetic diversity (including number of haplotypes, haplotype diversity and nucleotide diversity). Three population groups could be identified according to spatial analysis of molecular variance (SAMOVA). A similar tendency was found according to phylogenetic trees. The AMOVA revealed that N52% and 38% of variationwas attributed to groups and individualswithin populations, respectively. Gene flow among populations, estimated using the coalescent method, was relatively high (M = 196.8–825.4). Star-like networks and the demographic analysis (including neutrality testing and mismatch distribution) indicated that thrips underwent a recent population expansion in Guizhou and began to diverge in the Late Pleistocene. The results provided evidence that the eastern region of Guizhou was the source area for the species.
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Meng Sun,Bing Lü,Zhao-yun Lyu,Yang Zhang,Yi-Fan Zhai,Hao Chen,Li Zheng,Yi Yu 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
The flower bug Orius sauteri (Poppius) is commonly used as an effective biocontrol agent for controlling small pest populations in greenhouses in China. The impact of two temperature and photoperiod regimes (26 °C, L16:D8 h; 21 °C, L8:D16 h) on the life table of O. sauteri was studied in the laboratory using an age-stage, two-sex life-table method. The results showed that the low-temperature short-photoperiod regime resulted in significant increases of the developmental times of the egg, the first to fifth nymphal stages, and the total preadult stage. Female adult longevity was significantly increased, whereas male adult longevity was significantly decreased, under this regime. Furthermore, the adult preoviposition period (APOP), the total preoviposition period (TPOP), and the sex ratio were all increased under this regime. Fecundity decreased, whereas the mean generation time (T) increased, as temperature and photoperiod decreased. The intrinsic rate of increase (r), finite rate of increase (λ), and net reproductive rate (Ro) all increased as the temperature decreased under diapause induction. Based on the estimated data, the higher r value (0.06 d−1) occurred under the 26 °C, L16:D8 h regime, compared with 0.03 d−1, under the 21 °C, L8:D16 h regime. Thus, the results showed that reproductive diapause slowed O. sauteri population growth, about 50% reduction based on r. There is significant interest in using O. sauteri as a biological control agent against non-diapausing small pests, such as thrips, in greenhouses under short photoperiods. However, based on the current results, managers should consider maintaining a high temperature and long photoperiod to prevent reproductive diapause induction in O. sauteri. Such conditions should not have a detrimental effect on the greenhouse crops
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