Abstract:

Penicillium QW1 was isolated from soil in Hainan province against banana wilt disease caused by fusarium oxysporum f. sp. cubense race 4(FOC4). The morphological characteristics, colony characteristics and 26S rDNA sequences analysis of QW1 were studied. QW1 produces sexual spores. The substrate myceliums have no partition. The tops of conidiophores swell to broom shape. Single-conidiospore is oval and blue. The colony of QW1 is white when it starts growing on PDA medium, after matured, the aerial myceliums of QW1 become blue gradually because of spores. A phylogenetic tree was constructed by comparing with the published 26S rDNA sequences of the related species. The QW1 strain showed more than 99% identity with Penicillium. QW1 strain was classed to Penicillium. The co-culture tests in soil between QW1 and FOC4 indicated that QW1 had strong growth ability in soil and great resistance on FOC4.