تأثير بعض أنواع البكتيريا المحفزة لنمو النبات في فطر الفيوزاريوم على نبات الخس ضمن ظروف الزراعة المائية

Abstract

The aim of the research was to study the effect of three species of plant growth-promoting bacteria (Frateuria aurantia), (Rhizobium leguminosarum) and (Bacillus megaterium) on (Fusarium oxysporum) fungus on lettuce plants under hydroponic conditions through: the role of PGPR bacteria in reducing the symptoms of infection on lettuce plants. And evaluating inoculation with PGPR bacteria in reducing the effect of Fusarium wilt fungus on lettuce plants in pots, by measuring some morphological growth indicators and qualitative indicators. The results showed a reduction in the symptoms of infection with the pathogenic fungus (F. oxysporum) in the MF treatment, and an increase in the growth and qualitative indicators of lettuce plants compared to the two controls C and F. The growth of lettuce plants increased, and the effect of the pathogenic fungus on the length of the longest root, the number of leaves, and the wet and dry weight of the vegetative and root groups was reduced compared to the healthy control and the control infected with the fungus that were not treated with bacteria. The treatment with growth-stimulating bacteria led to an increase in the content of chlorophyll and beta-carotene in the leaves in all experimental treatments compared to the healthy control and the control infected with the fungus (F. oxysporum). Thus, the study can be continued to determine the effect of PGPR bacteria in different hydroponic systems and their effect on stimulating plant growth and productivity and reducing the effect of the pathogenic fungus (F. oxysporum) and another plant pathogens by adding them to plant seedlings to improve their growth, productivity, and resistance to plant diseases within the hydroponic system.