A total of 985 bacterial isolates were obtained from rice leaves and other grasses. The isolates were cultared in nutrient broth (NB) medium. After Centrifugated, 8000r/min for 10min, the supernatants of each bacterial NB cultures were tested for their suppressive effects on the germination and appressorium formation of Magnaporthe grisea. Of the tested isolates, 13 isolates showed suppressive effects. Three isolates identified as Psendomonas fluorescens (Xh216), Bacillus sp. (Xh222) and Pseudomonas. Sp. (Xh240), suppressed the disease severities on the detached rice leaves with the disease severity reduction 72.3%, 70.5% and 67.4%, respectively.

MGTAl. A putative fungal Zn (Ⅱ)2CyS6 transcriptional activator-encoding gene, was isolated from rice blast pathogen Magnaporthe grisea. Which is homologous to CLTAI from Colletotrichum lindemuthianum with 51% identity at protein level. MGTAI cassette contains a 2370 bp open reading frame, consisting of 6 exons, coding a 790 amino acid peptide. MGTAI gene exists as a single copy in genomes of 7 stranins of M. grisea, and is expressed in tip hyphae, conidia and mature appressoria of strain Guyl 1.

Chactomium spp. Are saprophytic Ascomycetes which act as plant debris cellulose destroying fungi with more than 300 species described all over world. These fungi are capable of producing many kinds of antagonistic substances and enzymes, especially cellulases, to suppress many plant pathogens and decay plant straw and municipal refuse, which leave us many aspects to be developed and applied.