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631.
632.
The biocontrol activity of three isolates of Pseudomonas fluorescens against gray mold of apple fruit caused by Botrytis mali and their ability to induce biochemical defense response in apple tissue were investigated. Apple fruit (Malus domestica) wounds were inoculated with 20 microL bacterial suspension (10(8) CFU mL(-1)) of Pseudomonas fluorescens followed 24 h later by 20 microL of conidial suspension of B. mali (10(5) conidia mL(-1)). The apples were then incubated at 20 degrees C for 11 days. Lesion diameters were evaluated 6 and 10 days after pathogen inoculation. In addition to controlling gray mold, these three isolates of P. fluorescens caused increase in peroxidase activities that reached maximum levels 2-6 days after pathogen inoculation. Phenolic accumulation was increased in apple fruit treated with antagonists and inoculated with B. mali and exhibited the highest level 6-8 days after treatment. The ability of P. fluorescens to increase activities of peroxidase and levels of phenol compounds maybe one of mechanism responsible its biocontrol activity. 相似文献
633.
The Mediterranean sponge Hamigera hamigera (family Anchinoideae) was studied since its total extract showed deterrent activity in a fish feeding assay. Eight compounds were isolated from the biologically active fractions and four of these proved to be new natural products, hamigeroxalamic acid (1), hamigeramine (2), hamigeramide (3) and hamiguanosinol (5). The structures of the new compounds were elucidated by 1D and 2D NMR spectroscopy and mass spectrometry. 相似文献