Identification and characterization of rhizosphere fungal strain MF-91 antagonistic to rice blast and sheath blight pathogens.
OBJECTIVE
To examine the inhibition effects of rhizosphere fungal strain MF-91 on the rice blast pathogen Magnaporthe grisea and sheath blight pathogen Rhizoctonia solani.


RESULTS
Rhizosphere fungal strain MF-91 and its metabolites suppressed the in vitro mycelial growth of R. solani. The inhibitory effect of the metabolites was affected by incubation temperature, lighting time, initial pH and incubation time of rhizosphere fungal strain MF-91. The in vitro mycelial growth of M. grisea was insignificantly inhibited by rhizosphere fungal strain MF-91 and its metabolites. The metabolites of rhizosphere fungal strain MF-91 significantly inhibited the conidial germination and appressorium formation of M. grisea. Moreover, the metabolites reduced the disease index of rice sheath blight by 35·02% in a greenhouse and 57·81% in a field as well as reduced the disease index of rice blast by 66·07% in a field. Rhizosphere fungal strain MF-91 was identified as Chaetomium aureum based on the morphological observation, the analysis of 18S ribosomal DNA internal transcribed spacer sequence and its physiological characteristics, such as the optimal medium, temperature and initial pH for mycelial growth and sporulation production.


CONCLUSIONS
Rhizosphere fungus C. aureum is effective in the biocontrolling of rice blast pathogen M. grisea and sheath blight pathogen R. solani both in in vitro and in vivo conditions.


CONCLUSIONS
This study is the first to show that rhizosphere fungus C. aureum is a potential fungicide against rice blast and sheath blight pathogens.
State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China.
Y L
YL
Wang
S Y
SY
Liu
X Q
XQ
Mao
Z
Z
Zhang
H
H
Jiang
R Y
RY
Chai
H P
HP
Qiu
J Y
JY
Wang
X F
XF
Du
B
B
Li
G C
GC
Sun
D000898:Antibiosis; D061046:Biological Control Agents; D002597:Chaetomium / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology*; D021903:DNA, Ribosomal Spacer / Q000235:genetics; D020082:Magnaporthe / Q000254:growth & development*; D025282:Mycelium / Q000254:growth & development; D012275:Oryza / Q000382:microbiology*; D010641:Phenotype; D010935:Plant Diseases / Q000382:microbiology* / Q000517:prevention & control; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D012232:Rhizoctonia / Q000254:growth & development*; D058441:Rhizosphere
D061046:Biological Control Agents; D021903:DNA, Ribosomal Spacer; D012337:RNA, Ribosomal, 18S