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• W2356311036 abstract "Up to now,seven components of sex pheromone of the cotton bollworm Helicoverpa armigera(Huber)(Lepidoptera Noctuidae)were identified,they were(Z)-11-hexadecenal(Z11-16:Ald),(Z)-9 hexadecenal(Z9-16:Ald),hexadecanal(16:Ald),(Z)-11-hexadecen-1-ol(Z11-16:OH),(Z)-7-hexadencenal(Z7-16:Ald),(Z)-9-tetradecenal(Z9-14:Ald) and tetradecanal(14:Ald).Sex pheromone lure was made up of two main components Z11-16:Ald and Z9-16:Ald,which had been applied in field for monitoring and controlling the pests for many years.Wherever in native or abroad,trapping effects by pheromone lure always appears significant differences among different generations or seasons.The effects of lure in trapping moths of the first and second generations were always better than that of in the third and fourth generations.In order to investigate the reasons of this seasonal variation,the influences of temperature and photoperiod on titer and ratio of female sex pheromone were studied.The cotton bollworms were reared from egg to adult under four temperature(22℃、25℃、28℃、30℃)with the long daily photoperiod(14L∶10D)and four photoperiods(12L∶12D,13L∶11D,14L∶10D,15L∶9D)with the temperature 25℃,respectively,which corresponding to the natural conditions of 1~4 generations in Nanjing.Pheromone were extracted from single gland by hexane containing 11:Ac as an internal standard(1.0838ng/μl).Extracts were analyzed by capillary GC on SHIMADZU GC 14B equipped with a FID detector and a splitless injector system.A 30m×0.25mm×0.25μm SE-54 column was kept at 100℃ for 2 min and then programmed to 250℃ at rate of 10℃/min.The components were identified by comparison of the GC retention times of the standards.The quantity of each component was calculated by comparing the peak area with that of 11:AC.The results showed that different temperature under the same photoperiod and different photoperiod under the same temperature effected the titer of sex pheromone significantly(P0.05).The lower the temperature and the shorter the photoperiod could increased the titer of sex pheromone components.Detailed variance analysis showed that the titer of major component Z11-16:Ald differed significantly between 22℃,25℃ and 28℃,30℃(P0.05) but not so between 22℃ and 25℃ or 28℃ and 30℃.The titer of minor component Z9-16:Ald differed significantly between 22℃ and other three temperature treatment.As researching on the effect of photoperiod on titer,the titer of main components such as Z11-16:Ald,Z9-16:Ald and 16:Ald differed significantly between under 12 hour light condition and other three light conditions.It means that the short daily photoperiod,12h light is the more important factor effecting the composition of sex pheromone.The relative ratio of main components such as Z11-16:Ald,Z9-16:Ald and 16:Ald varied not obviously under different temperatures except 14:Ald and Z11-16:OH.However the influence of photoperiod showed that the relative ratio of major component Z11-16:Ald differentiated significantly under 13L and 15L(P0.05),but not so under 12L and 14L.The relative ratio of the minor component Z9-16:A1l differentiated significantly under 12L and 14L,but not under 13L and 15L.The relative ratio of Z9-14:Ald differentiated significantly under 13L and 12L(P0.05).To sum up the results we may see that environment condition did effect the compositions of sex pheromone and interfere with insect sex communication.The low temperature and short light during adult and pupae stages could increase the sex pheromone titer within the limits of temperature and photoperiod.Similar results had been reported on other insect,true armyworm Pseudaletia unipuncta,oritential tobacco budworm Helicoverpa assulta and potato tuberworm Phthorimace operculella.Besides the temperature and photoperiod,other environment factors such as host volatile and allomone also may influence the compositions and functions of insect sex pheromone.Therefore,we should consider to change some compositions,concentrations or ratios of the sex pheromone lure while used in different seasons or generations in orde" @default.
• W2356311036 created "2016-06-24" @default.
• W2356311036 creator A5085504434 @default.
• W2356311036 date "2002-01-01" @default.
• W2356311036 modified "2023-09-25" @default.
• W2356311036 title "The Effect of Temperature and Photoperiod on Titer and Ratio of the Female Sex Pheromone Components of Helicoverpa armigera" @default.
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