Five strains of antarctic bacteria producing extracellular low-temperature lipase are screened from seawater collectedby CTD during the Chinese 18th Antarctic Scientific Expedition. Their phylogenetic positions on the...Five strains of antarctic bacteria producing extracellular low-temperature lipase are screened from seawater collectedby CTD during the Chinese 18th Antarctic Scientific Expedition. Their phylogenetic positions on the basis ofamplification, comparison and analysis of almost complete 16S rDNA sequence are determined by neighbor-joininganalysis. Phylogenetic analysis indicates that all of these five strains belong to g-proteobacteria. The strains 11102 and 92 are classified as genus Pseudoalteromonas sp. and genus Psychrobacter sp. respectively. The strains 25101, 2221 and 1281 are classified as genus Moritella sp.展开更多
Induction of VOCs (volatile organic compounds) in the leaves of Lycopersicon esculentum by chitosan oligomer elictor was studied. The results demonstrated that VOCs in chitosan oligomer-treated leaves showed stronger ...Induction of VOCs (volatile organic compounds) in the leaves of Lycopersicon esculentum by chitosan oligomer elictor was studied. The results demonstrated that VOCs in chitosan oligomer-treated leaves showed stronger inhibitory activity against Botrytis cinerea than that in water-treated leaves, and the spore germination was reduced by 22.1% in 144h after elicitor treatment at a concentration of 1.0%. A total of 16 constituents were detected in water-treated leaves, and chitosan oligomer treatment increased the amount of VOCs production. Chitosan oligomer at different concentration and different time courses of induction treatment could induce different amount of VOCs. Chitosan oligomer resulted in an optimal production of VOCs in 144h after elicitation at concentration of 0.6%. Chitosan oligomer also enhanced activtity of PAL and LOX. The results showed that the enhancement of VOCs production after chitosan oligomer treatment might be an important agent for L.esculentum acquiring resistance against pathogen.展开更多
文摘Five strains of antarctic bacteria producing extracellular low-temperature lipase are screened from seawater collectedby CTD during the Chinese 18th Antarctic Scientific Expedition. Their phylogenetic positions on the basis ofamplification, comparison and analysis of almost complete 16S rDNA sequence are determined by neighbor-joininganalysis. Phylogenetic analysis indicates that all of these five strains belong to g-proteobacteria. The strains 11102 and 92 are classified as genus Pseudoalteromonas sp. and genus Psychrobacter sp. respectively. The strains 25101, 2221 and 1281 are classified as genus Moritella sp.
文摘Induction of VOCs (volatile organic compounds) in the leaves of Lycopersicon esculentum by chitosan oligomer elictor was studied. The results demonstrated that VOCs in chitosan oligomer-treated leaves showed stronger inhibitory activity against Botrytis cinerea than that in water-treated leaves, and the spore germination was reduced by 22.1% in 144h after elicitor treatment at a concentration of 1.0%. A total of 16 constituents were detected in water-treated leaves, and chitosan oligomer treatment increased the amount of VOCs production. Chitosan oligomer at different concentration and different time courses of induction treatment could induce different amount of VOCs. Chitosan oligomer resulted in an optimal production of VOCs in 144h after elicitation at concentration of 0.6%. Chitosan oligomer also enhanced activtity of PAL and LOX. The results showed that the enhancement of VOCs production after chitosan oligomer treatment might be an important agent for L.esculentum acquiring resistance against pathogen.
