In vitro antifungal activity of the acetone, methanol and chloroform extracts of four lichen species viz, Bulbothirx setschwanensis, Everniastrum nepalense, Heterodermia diademata, Parmelaria thomsonii were investigat...In vitro antifungal activity of the acetone, methanol and chloroform extracts of four lichen species viz, Bulbothirx setschwanensis, Everniastrum nepalense, Heterodermia diademata, Parmelaria thomsonii were investigated against seven plant pathogenic fungi (Aspergillus flavus, A. fumigatus, Alternaria alternata, Fusarium oxysporum, F. solani, F. roseum and Penicillium citrinum) with reference to commercially available synthetic antifungal drug Ketoconazole (positive control). Lichen secondary metabolites were extracted using Soxhlet extractor and were further recovered through gentle evaporation of solvents in rotatory evaporator. Antifungal activity was analysed employing BauerKirby disc diffusion assay. Acetone and methanol extracts of lichenized fungi were found more effective against tested plant pathogenic fungi. Principal component analysis concluded that though, Ketoconazole was effective against four of the tested plant pathogenic fungi, acetone and methanol extracts of lichens were comparatively more effective against some broad spectrum plant pathogenic fungi (Fusarium oxysporum, F. solani, F. roseum).展开更多
Lichens are abundant and highly diverse in tropical areas such as the Philippines due to its climate and geographical features.However,several regions of the country remained underexplored or unexplored and many speci...Lichens are abundant and highly diverse in tropical areas such as the Philippines due to its climate and geographical features.However,several regions of the country remained underexplored or unexplored and many species remained undiscovered in the country’s many unique habitats.This study determines the occurrence of foliose lichens in Casaroro Falls and Pulangbato Falls in Valencia,Negros Oriental,Philippines.The lichen morphologies were characterized using available taxonomic keys.Among the 26 lichen samples collected from the two falls,23 specimens were identified based on their morphological and biochemical characteristics.Of these,8 species were specific to Casaroro Falls and 13 species to Pulangbato Falls,with only 2 species of lichens found on both waterfalls.Interestingly,17 species are new records for the Philippines.展开更多
Lichen exploration of West Kameng district and Tawang district of Arunachal Pradesh state,India located in the Eastern Himalayas reveal seventy nine lichens represented primarily by foliose(73%),a few fruticose(15%),d...Lichen exploration of West Kameng district and Tawang district of Arunachal Pradesh state,India located in the Eastern Himalayas reveal seventy nine lichens represented primarily by foliose(73%),a few fruticose(15%),dimorphic(8%),leprose(2%)and crustose(1%)types.Of these,seventeen species,one fruticose,sixteen foliose growth forms,belonging to 12 genera and 5 families are recorded as new additions to the lichen flora of Arunachal Pradesh state.The lichens were sampled at an elevation ranging from 1618 meter to 4509 meter.The diagnostic features of new additions to macrolichens of Arunachal Pradesh based on the phytogeographic affinities and distribution of species is briefly described.展开更多
文摘In vitro antifungal activity of the acetone, methanol and chloroform extracts of four lichen species viz, Bulbothirx setschwanensis, Everniastrum nepalense, Heterodermia diademata, Parmelaria thomsonii were investigated against seven plant pathogenic fungi (Aspergillus flavus, A. fumigatus, Alternaria alternata, Fusarium oxysporum, F. solani, F. roseum and Penicillium citrinum) with reference to commercially available synthetic antifungal drug Ketoconazole (positive control). Lichen secondary metabolites were extracted using Soxhlet extractor and were further recovered through gentle evaporation of solvents in rotatory evaporator. Antifungal activity was analysed employing BauerKirby disc diffusion assay. Acetone and methanol extracts of lichenized fungi were found more effective against tested plant pathogenic fungi. Principal component analysis concluded that though, Ketoconazole was effective against four of the tested plant pathogenic fungi, acetone and methanol extracts of lichens were comparatively more effective against some broad spectrum plant pathogenic fungi (Fusarium oxysporum, F. solani, F. roseum).
文摘Lichens are abundant and highly diverse in tropical areas such as the Philippines due to its climate and geographical features.However,several regions of the country remained underexplored or unexplored and many species remained undiscovered in the country’s many unique habitats.This study determines the occurrence of foliose lichens in Casaroro Falls and Pulangbato Falls in Valencia,Negros Oriental,Philippines.The lichen morphologies were characterized using available taxonomic keys.Among the 26 lichen samples collected from the two falls,23 specimens were identified based on their morphological and biochemical characteristics.Of these,8 species were specific to Casaroro Falls and 13 species to Pulangbato Falls,with only 2 species of lichens found on both waterfalls.Interestingly,17 species are new records for the Philippines.
基金financial support through DBT-Twinning program(BT/183/NE/TBP/2011,Dtd.23/04/2012).RD thanks UGC,New Delhi for BSR fellowship.
文摘Lichen exploration of West Kameng district and Tawang district of Arunachal Pradesh state,India located in the Eastern Himalayas reveal seventy nine lichens represented primarily by foliose(73%),a few fruticose(15%),dimorphic(8%),leprose(2%)and crustose(1%)types.Of these,seventeen species,one fruticose,sixteen foliose growth forms,belonging to 12 genera and 5 families are recorded as new additions to the lichen flora of Arunachal Pradesh state.The lichens were sampled at an elevation ranging from 1618 meter to 4509 meter.The diagnostic features of new additions to macrolichens of Arunachal Pradesh based on the phytogeographic affinities and distribution of species is briefly described.
