We evaluated the effects of rice black streak dwarf virus （RBSDV）-infested rice plants on the ecological parameters and its relevant defensive and detoxification enzymes of white-backed planthopper （WBPH） in labor...We evaluated the effects of rice black streak dwarf virus （RBSDV）-infested rice plants on the ecological parameters and its relevant defensive and detoxification enzymes of white-backed planthopper （WBPH） in laboratory for exploring the relationship between RBSDV and the non-vector planthopper. The results showed that nymph survival rate, female adult weight and fecundity, and egg hatchability of WBPH fed on RBSDV-infested rice plants did not markedly differ from those on healthy plants, whereas the female adult longevity and egg duration significantly shortened on diseased plants. Furthermore, significantly higher activities of defensive enzymes （dismutase, catalase and peroxidase） and detoxification enzymes （acetylcholinesterase, carboxylesterase and glutathione S-transferase） were found in WBPH adults fed on infected plants. Results implied that infestation by RBSDV increased the ecological fitness of non-vector planthopper population.展开更多
Rice black streak dwarf virus （RBSDV） is transmitted by the small brown planthopper （SBPH）, Laodelphax striatellus （Fallen）. Non-vector rice brown planthopper （BPH）, Nilaparvata lugens （Stal）, shares the sam...Rice black streak dwarf virus （RBSDV） is transmitted by the small brown planthopper （SBPH）, Laodelphax striatellus （Fallen）. Non-vector rice brown planthopper （BPH）, Nilaparvata lugens （Stal）, shares the same host rice plants with SBPH in paddy fields. The changes in nutritional composition of rice plants infected by RBSDV and the ecological fitness of BPH feeding on the infected plants were studied under both artificial climate chamber and field conditions. Contents of 16 detected amino acids and soluble sugar in RBSDV infected rice plants were higher than those in the healthy ones. On the diseased plants BPH had significantly higher nymphal survival rates, nymphal duration of the males, weight of the female adults, as well as egg hatchability compared to BPH being fed on healthy plants. However, there was no obvious difference in female nymph duration, longevity and fecundity. Defense enzymes （superoxidase dismutase, SOD and catalase, CAT） and detoxifying enzymes （carboxylesterase, CAE and glutathione S-transferase, GST） in BPH adults fed on diseased plants had markedly higher activities. The results indicate rice plants infected by RBSDV improved the ecological fitness of the brown planthopper, a serious pest but not a transmitter of the RBSDV virus.展开更多
针对室内可见光定位中非视距信道(Non Line of Sight,NLOS)导致定位精度不足的问题,提出了一种基于动态高斯加权(Dynamic Gaussian Weighted,DGW)接收信号强度指示(Received Signal Strength Indicator,RSSI)和遗传算法(Genetic Algorit...针对室内可见光定位中非视距信道(Non Line of Sight,NLOS)导致定位精度不足的问题,提出了一种基于动态高斯加权(Dynamic Gaussian Weighted,DGW)接收信号强度指示(Received Signal Strength Indicator,RSSI)和遗传算法(Genetic Algorithm,GA)改进支持向量回归(Support Vector Regression,SVR)的室内可见光定位算法。首先,构建指纹库并划分数据集,计算接收器与光源之间的距离动态调整高斯函数的标准差,再结合RSSI信号的波动性进行自适应加权,以减少NLOS对定位的影响。然后,使用GA优化SVR模型的参数,得到最佳定位模型。最后,使用最佳定位模型对加权后的指纹数据进行定位预测。实验结果表明:本算法的平均定位误差为7.1 cm,相较于SVR、SVR-GA等算法降低了21.1%~42.3%,并且能有效降低NLOS的影响、提高室内定位的精度,具有较强的应用前景。展开更多
基金supported by the National Basic Research Program of China(Grant No.2010CB126200)the AgroIndustry R&D Special Fund of China(Grant Nos.200903051 and 201003031)
文摘We evaluated the effects of rice black streak dwarf virus （RBSDV）-infested rice plants on the ecological parameters and its relevant defensive and detoxification enzymes of white-backed planthopper （WBPH） in laboratory for exploring the relationship between RBSDV and the non-vector planthopper. The results showed that nymph survival rate, female adult weight and fecundity, and egg hatchability of WBPH fed on RBSDV-infested rice plants did not markedly differ from those on healthy plants, whereas the female adult longevity and egg duration significantly shortened on diseased plants. Furthermore, significantly higher activities of defensive enzymes （dismutase, catalase and peroxidase） and detoxification enzymes （acetylcholinesterase, carboxylesterase and glutathione S-transferase） were found in WBPH adults fed on infected plants. Results implied that infestation by RBSDV increased the ecological fitness of non-vector planthopper population.
文摘Rice black streak dwarf virus （RBSDV） is transmitted by the small brown planthopper （SBPH）, Laodelphax striatellus （Fallen）. Non-vector rice brown planthopper （BPH）, Nilaparvata lugens （Stal）, shares the same host rice plants with SBPH in paddy fields. The changes in nutritional composition of rice plants infected by RBSDV and the ecological fitness of BPH feeding on the infected plants were studied under both artificial climate chamber and field conditions. Contents of 16 detected amino acids and soluble sugar in RBSDV infected rice plants were higher than those in the healthy ones. On the diseased plants BPH had significantly higher nymphal survival rates, nymphal duration of the males, weight of the female adults, as well as egg hatchability compared to BPH being fed on healthy plants. However, there was no obvious difference in female nymph duration, longevity and fecundity. Defense enzymes （superoxidase dismutase, SOD and catalase, CAT） and detoxifying enzymes （carboxylesterase, CAE and glutathione S-transferase, GST） in BPH adults fed on diseased plants had markedly higher activities. The results indicate rice plants infected by RBSDV improved the ecological fitness of the brown planthopper, a serious pest but not a transmitter of the RBSDV virus.
文摘针对室内可见光定位中非视距信道(Non Line of Sight,NLOS)导致定位精度不足的问题,提出了一种基于动态高斯加权(Dynamic Gaussian Weighted,DGW)接收信号强度指示(Received Signal Strength Indicator,RSSI)和遗传算法(Genetic Algorithm,GA)改进支持向量回归(Support Vector Regression,SVR)的室内可见光定位算法。首先,构建指纹库并划分数据集,计算接收器与光源之间的距离动态调整高斯函数的标准差,再结合RSSI信号的波动性进行自适应加权,以减少NLOS对定位的影响。然后,使用GA优化SVR模型的参数,得到最佳定位模型。最后,使用最佳定位模型对加权后的指纹数据进行定位预测。实验结果表明:本算法的平均定位误差为7.1 cm,相较于SVR、SVR-GA等算法降低了21.1%~42.3%,并且能有效降低NLOS的影响、提高室内定位的精度,具有较强的应用前景。
