[Obstacles of soybean continuous cropping, III. Mechanism of soybean yield increment by marine actinomyces MB-97].
An isolate of marine actinomyces MB-97 identified as Streptomyces microflavus could successfully colonize in the rhizoshpere of soybean, and inhibit Penicillium purpurogenum, a soybean deleterious rhizospheric microorganisms. After applied MB-97, the ratio of bacteria/fungi in the rhizosphere of soybean was increased, and the soil became to be "Bacterial type" from "Fungal type". The populations of P. purpurogenum were apparently suppressed about 80%, and the harm of toxins in soil was weak. The soybean root rot caused by soilborne fungi such as Fusarium was decreased 50%, and MB-97 could stimulate the growth of soybean seedlings. In field study, the mean yield of soybean raised by 15.2%, implying that Streptomyces microflavus was an effective plant growth-promoting rhizobacteria on soybean.
Hu
Jiangchun
J
Laboratory of Terrestrial Ecological Process, Institute Applied Ecology, Chinese Academy of Sciences, Shenyang 110016. Hujc@iae.ac.cn
Xue
Delin
D
Wang
Shujin
S
D000190:Actinomyces / Q000502:physiology*; D000383:Agriculture; D018556:Crops, Agricultural; D017753:Ecosystem; D010407:Penicillium / Q000502:physiology; D018517:Plant Roots / Q000382:microbiology; D012988:Soil Microbiology; D013025:Glycine max / Q000382:microbiology / Q000502:physiology*; D013302:Streptomyces / Q000502:physiology; D013559:Symbiosis