دور بعض عوامل المقاومة الأحيائية الفطرية و البكتيرية في استحثاث مقاومة نبات الخيار ضد الفطرRhizoctonia solani

Abstract EN

This study was carried out to investigate the mechanisms of induced resistance in cucumber plant against pathogenic fungus Rhizoctonia solani by biocontrol agents Tricoderma harzianum fungus, Basillus subtilis bacterium and mycorrhizal fungus Glomus mosseae.

The biocontrol agents showed their ability to induce several mechanisms of resistance in cucumber plant against pathogenic fungus.

The treatment with T.

harzianum showed significantly increased polyphenol oxidase activity which was 10.6707 unit/g fresh weight.

The G.

mosseae + B.

subtilis treatment was superior to other treatments; it increased plant content of total phenol which reached 1.989 mg/g fresh weight.

B.

subtilis treatment significantly increased plant content of lignin which was 18.318 mg/g fresh weight.

The treatment with T.

harzianum + B.

subtilis showed significantly increase in plant content of salicylic acid hormone which was 1.8658 mg/g fresh weight.

No jasmonic acid hormone activity was detected in treated plants, and at low level in some treatments.

The treatment with G.

mosseae + T.

harzianum + B.

subtilis produced the highest total protein content which reached 239.3 μg/mg.