Pseudomonas spp. Producing Antimicrobial Compounds Regulate Fungal Communities Inhabiting Wheat Crown in Southern Chile

The 2,4-Diacetylphloroglucinol (2,4-DAPG) and phenazine (PCA)-producing Pseudomonas inhibit wheat pathogens’ development, but the relationship between communities of pathogens genotypes these bacteria has been little studied. Relationships crown fungi associated with presence 2,4-DAPG PCA-producing pseudomonads were evaluated in four commercial crops located La Araucanía Los Lagos Regions Chile, during two seasons. Portions base first internode culm collected grain-filling stage cultured an artificial medium for fungal isolation, while roots same plants from previous harvest, also used to assess yield plant height, detection spp. using PCR specific primers. Genera Phaeosphaeria, Fusarium, Rhizoctonia, Microdochium repeatedly isolated (52.6%, 22.1%, 7.8%, 4.9%, respectively) genetic composition varied fields sampling periods. Genetic groups A, B, D, K, L, P phlD gene detected. 2,4-DAPG-producing benefited crop health, relating their existence increasing reduction incidence severity disease caused by pathogenic microorganisms on culms.