The paper is about the systematic studies of biological characteristi cs of indigenous rhizobia isolated from Acacia spp The results showed th at the re were typical characteristics of rhizobia in 15 stains rhizobia isolated and purified from Acacia spp in Guangxi province Their physiological and bio chemic al characteristics were similar The nodules could appeared in Acacia crassic arpa seedlings inoculated with these rhizobia Among these rhizobia there wer e f a st growers and slow growers rhizobia Most of them could utilized inorganic n itr ogen sources Both five monosaccharides and three disaccharides could be utiliz e d as carbon sources except Heimu 1 could not utilized lactose Most of rhizobia produced acid except Zajiao 1,Taiwan 1 and Zhigan 4 stains produced alkai in BT B reaction

In order to improve ferment efficiency of biocontrol agent Burkholderia pyrrocinia JK-SH007, the fermentation conditions of this strain were optimized. The optimal fermentation conditions were corn steep liquor (13.88 g/L) and glucose (3.37 g/L) by screening test, steepest ascent experiments and response surface analysis. The results showed that the cell density of JK-SH007 (1.18 x 10(9) CFU/mL) increased 1.35 times than before, and there was a 28.84% increase in antifungal activity.
Biological Control Agents ; Burkholderiaceae ; growth & development ; Fermentation ; Glucose ; chemistry ; Surface Properties ; Zea mays ; chemistry