The data here showed that Bacillus sp. CHM1 could be a potential agent to protect maize, horsebean, cole and rice (Oryza sativa)plants from infection by pathogenic fungi in vivo and had properties as a plant growth-promoting endophytic bacterium (PGPE).
Control efficacy of CHM1 against rice sheath blight, southern
blight of maize and Rhizoctonia solani of horsebean under
greenhouse conditions Maize seedlings (Liao No. 613) were cultivated under controllable
greenhouse conditions at a temperature of 20–25 C and
relative humidity of 80–90%.
At the three leave stage, maize seedlings
were divided into three groups, each of which included thirty
seedlings. The conidiospores of Bipolaris maydis were collected and
diluted as 1 104 conidia ml1. A CHM1 culture solution
(1.6 107 cfu ml1) was obtained after incubation at 30 C,170 rpm
for 36 h, was diluted two fold (mixed with distilled water at 1:1 to
decrease the density to 8 106 cfu ml1) and then evenly sprayed
on the surface of maize leaves. After 6 h, the maize leaves were
inoculated by evenly spraying with the conidiospores of B. maydis.
The seedlings were first cultivated in the dark overnight at 24 C
and 98% relative humidity and then cultivated in a growth chamber
with 16-h-light and 8-h-darkness cycle at 24 C and 85% relative
humidity (Mu, 2000). Each treatment, in triplicate, was arranged in
a completely randomized block with 3 30 plants. Spraying with
diluted LB medium and conidiospores of B. maydis served as
a negative control, and spraying with distilled water served as
control. After pathogen challenge, the disease was observed every
2 days. Disease index and protection effect by CHM1 were visually
rated by assessing the percentage of leaf surface covered by disease
spots
efficacy of CHM1 against rice sheath blight, southern
blight of maize and Rhizoctonia solani of horsebean under
greenhouse conditions Maize seedlings (Liao No. 613) were cultivated under controllable
greenhouse conditions at a temperature of 20–25 C and
relative humidity of 80–90%