الفلورا الفطرية السائدة في محيط جذور نبات البندورة الطماطم المحمية في الساحل السوري و تأثرها مع الممرض Pyrenochaeta lycopersici

الملخص EN

Corky root caused by Pyrenochaeta lycopersici is one of the most important diseases of tomatoes in greenhouses along the Syrian cost.

The study was carried out in three locations (Ras Alain, Zheiriat and Sanawber Station) during 2007/08 and 2008/09, to isolate and identify the prevalent fungi from the tomato rhizosphere, estimate their abundance, and evaluate the in vitro antagonism against the pathogen.

Results showed differences in the total abundance of fungi in these locations, with 247 dominant isolates belonging to 13 fungal genera; among which Aspergillus and Penicillium were the most dominant.

Soil organic matter content significantly correlated with the abundance of antagonistic fungi (r = 0.88).

Fungal isolates differed in their ability to inhibit the pathogen growth by 25.1- 88.8%.

A total of 139 isolates showed high antagonistic potential (≥ 60% inhibition).

Trichoderma, Mucor, Rhizopus and some of Aspergillus isolates overgrew the pathogen and dominated the space (competition for nutrient), and covered the pathogen colony (mycoparasitism).

Most of Aspergillus isolates and some Penicillium isolates inhibited the pathogen growth by producing antifungal metabolites.

Thus, soil organic matter can contribute to developing antagonistic mycoflora in the soil, increasing its ability to suppress