Influence of antifungal compounds from a soil-borne actinomycete onFusarium spp. in asparagus.
Paraules clau
Resum
Asparagus decline syndrome is caused by fungal infection of asparagus roots and crowns byFusarium oxysporum f.sp.asparagi (FOA) andF. moniliforme (FM). Several soil-borne microorganisms have been found inhibitory toFusarium pathogens in other crops. A novelStreptomyces spp. (ME2-27-19A) was isolated from asparagus field soil and found to be inhibitory to FOA and FM in vitro. Solvent extraction of ME2-27-19A and Chromatographic purification of the extract yielded compound(s) that were inhibitory to FOA and FM at 40Μg/ml. ME2-27-19A extract produced variable control of FOA and FM in vitro, and was phytotoxic at 1000 (Μg/ml. In soil, ME2-27-19A extract reduced theFusarium population at 100Μg/ml, but also reduced the asparagus shoot length.