In order to get a great quantity of spores of Botryosphaeria berengeriana f.sp.piricola,several methods to promote sporulation of the pathogen were compared.The results showed that the wounded young apple fruits withi...In order to get a great quantity of spores of Botryosphaeria berengeriana f.sp.piricola,several methods to promote sporulation of the pathogen were compared.The results showed that the wounded young apple fruits within 60-day old was inoculated with mycelia of B.berengeriana f.sp.piricola and induced under the 365 nm-UV-light;when the brown lesion was shown,the young apple began to form pycnidia on the lesion around the inoculation point after 3-5 days irradiation with UV-light and extruded plenty of conidia.This method induced great more conidia than that of irradiating wounded mycelia with UV-light.However,mature apple seldom produced conidia when induced with the same method.展开更多
The rDNA-IGS of 11 Ustilaginoidea virens isolates from different geographical regions in China were amplified by PCR and sequenced. The results showed that the rDNA-IGS fragments consisted of one cen-tral variable reg...The rDNA-IGS of 11 Ustilaginoidea virens isolates from different geographical regions in China were amplified by PCR and sequenced. The results showed that the rDNA-IGS fragments consisted of one cen-tral variable region and two lateral conservative regions. The two conservative sequences among the11 isolates shared the sequence similarity of 99.44%. The variable region consisted of 2,4,or 6 of 77 bp-length-repeats in the isolates and the sequences of the repeat units were high conservative. Primers UIGS III and UIGS IV were designed for amplification of the variable region in the rDNA-IGS.展开更多
文摘In order to get a great quantity of spores of Botryosphaeria berengeriana f.sp.piricola,several methods to promote sporulation of the pathogen were compared.The results showed that the wounded young apple fruits within 60-day old was inoculated with mycelia of B.berengeriana f.sp.piricola and induced under the 365 nm-UV-light;when the brown lesion was shown,the young apple began to form pycnidia on the lesion around the inoculation point after 3-5 days irradiation with UV-light and extruded plenty of conidia.This method induced great more conidia than that of irradiating wounded mycelia with UV-light.However,mature apple seldom produced conidia when induced with the same method.
文摘The rDNA-IGS of 11 Ustilaginoidea virens isolates from different geographical regions in China were amplified by PCR and sequenced. The results showed that the rDNA-IGS fragments consisted of one cen-tral variable region and two lateral conservative regions. The two conservative sequences among the11 isolates shared the sequence similarity of 99.44%. The variable region consisted of 2,4,or 6 of 77 bp-length-repeats in the isolates and the sequences of the repeat units were high conservative. Primers UIGS III and UIGS IV were designed for amplification of the variable region in the rDNA-IGS.
