Cell-wall-degrading enzymes produced in vitro and in vivo by , the causative fungus of peanut sheath blight.

causes the disease peanut sheath blight, involving symptoms of maceration and necrosis of infected tissue, mainly caused by cell-wall-degrading enzymes (CWDEs). This study investigated the production of CWDEs including polygalacturonase (PG), polymethyl-galacturonase (PMG), cellulase (Cx) and β-glucosidase by in vitro (in liquid culture) and in vivo (in peanut plants). Significant PG, PMG, Cx and β-glucosidase activities were detected in infected tissues including stalk and leaves of Baisha and Silihong peanut cultivars.

[Influence of exogenous ginsenosides on new forest soil microbial communities].

Ginsenosides are the main active ingredient and allelochemicals of Panax ginseng, and they play an important role in ginseng growth and in ecological adaptation. To study the influence of ginsenosides on soil microbial communities, the method of given exogenous total ginsenosides of different concentrations were used to study the influence of ginsenosides on new forest soil microbial community, evaluate the change of metabolic activity of microbial community and investigate the ecological effect of ginsenosides on soil microbial community. Results showed that, exogenous total ginsenosides promoted metabolic activity of microbial community in new forest soil at different concentrations compared with the control after 10 d and 40 d treatment.

Proteomics research and related functional classification of liquid sclerotial exudates of .

is a necrotrophic soil pathogen that mainly infects the root and basal stem of ginseng, causing serious commercial losses. Sclerotia, which are important in the fungal life cycle, are hard, asexual, resting structures that can survive in soil for several years. Generally, sclerotium development is accompanied by the exudation of droplets.

[Allelopathic effects of phenolic compounds of ginseng root rhizosphere on Cylindrocarpon destructans.].

In this study, five phenolic compounds of ginseng rhizosphere soil were identified by HPLC, including gallic acid, salicylic acid, 3-phenylpropionic acid, benzoic acid and cinnamic acid. The results show that five phenolic compounds inhibited mycelium growth and spore germination at high concentration, but promoted mycelium growth and spore germination at low concentration. Gallic acid, salicylic acid, benzoic acid of 0.

[Genetic diversity of Ascochyta anemones isolates in Liaoning Province of Northeast China].

Windflower leaf spot is a newly reported leaf disease in China, and becomes very serious in the protected field of windflower (Pulsitilla chinensis) in Liaoning Province. In this study, a random amplified polymorphic DNA (RAPD) analysis was made on the 25 Ascochyta anemones isolates from 5 main P. chinensis production areas in the Province and 5 Ascochyta spp.

Mesorhizobium spp. are the main microsymbionts of Caragana spp. grown in Liaoning Province of China.

Caragana species are woody legumes widely distributed in the arid regions of China. These plants form root nodules but their nodule bacteria have not been clearly classified. A total of 112 symbiotic bacterial isolates were obtained from four Caragana species grown in Liaoning Province and were characterized with ARDRA, sodium dodecyl sulfate-polyacrylamide gel electrophoresis of proteins, BOX-PCR and sequencing of the 16S rRNA gene.