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金龟子绿僵菌分生孢子暴露在B段紫外光下毒力的降低
引用本文:José C Barbosa.金龟子绿僵菌分生孢子暴露在B段紫外光下毒力的降低[J].安徽农业大学学报,2008,35(2):246-249.
作者姓名:José  C  Barbosa
摘    要:The UV-A and UV-B wavelengths of solar radiation may seriously reduce viability of Metarhizium anisopliae conidia,a fungus used extensively in Brazil for insect pest control.The conidial tolerances to UV-A and UV-B radiation were studied for one isolate(IBCB 425) commercially available product produced on rice grains.Aqueous or oil emulsion conidial suspensions were irradiated for 0(control),2,or 3 h using the solar simulator filtered with diacetate filter to remove UV-C radiation which afforded 652 mW·m-2 in the spectral range of 280~370 nm.The UV tolerance was based on conidial germination(viability) and virulence to Diatraea saccharalis larvae.Conidia formulated with oil emulsion had higher survival after 3 h of UV exposure,but the virulence of the conidia previously exposed to 2 h of UV radiation were similar when oil formulated or not.The mortality of D.saccharalis caterpillars exposed to non-UV-irradiated conidia was greater than that of larvae exposed to irradiated conidia,and the LT50 values were lower for the non-irradiated suspensions than for those irradiated.This apparent reduction in virulence was directly related reduction in viability or delay of germination of UV-irradiated conidia.

关 键 词:模拟阳光  无性孢子表述  无性孢子萌芽  毒性

Exposure of Metarhizium anisopliae conidia to UV-B radiation reduces its virulence
Edimara A Francisco,Drauzio E N Rangel,Newton La Scala Jr,Ant.Exposure of Metarhizium anisopliae conidia to UV-B radiation reduces its virulence[J].Journal of Anhui Agricultural University,2008,35(2):246-249.
Authors:Edimara A Francisco  Drauzio E N Rangel  Newton La Scala Jr  Ant
Institution:Edimara A Francisco,Drauzio E N Rangel,Newton La Scala Jr,Ant(o)nia do C B Correia
Abstract:The UV-A and UV-B wavelengths of solar radiation may seriously reduce viability of Metarhizium anisopliaeconidia,a fungus used extensively in Brazil for insect pest control. The conidial tolerances to UV-A and UV-B radiation werestudied for one isolate (IBCB 425) commercially available product produced on rice grains. Aqueous or oil emulsion conidialsuspensions were irradiated for O (control), 2, or 3 h using the solar simulator filtered with diacetate filter to remove UV-Cradiation which afforded 652 mW.m-2 in the spectral range of 280~370 nm. The UV tolerance was based on conidial germi-nation (viability) and virulence to Diatraea saccharalis larvae. Conidia formulated with oil emulsion had higher survival after3 h of UV exposure, but the virulence of the eonidia previously exposed to 2 h of UV radiation were similar when oil formula-ted or not. The mortality of D. saccharalis caterpillars exposed to non-UV-irradiated conidia was greater than that of larvae ex-posed to irradiated conidia, and the LT50values were lower for the non-irradiated suspensions than for those irradiated. Thisapparent reduction in virulence was directly related reduction in viability or delay of germination of UV-irradiated conidia.
Keywords:simulated sunlight  conidial formulation  conidial germination  virulence  Diatraea saccharalis
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