Influences of Biological Control on Damping Off Diseases of Faba beans as well as Physico-Chemical and Technological Properties

Abstract

Faba bean seeds are the most important legumes in terms of consumption, for its positive nutritional properties and the most important diseases of Faba bean seeds are damping off. The field experiments was carried out during the 20172018 and 2018-2019 seasons to study the effect of the biocontrol agents as well as Rizolex T on the incidence of Faba beans damping off disease. The growth parameters, yield and its quality parameters of Faba bean plants were also, studied. The cultures of Paenibacillus polymyxa, Pseudomonas fluorescens and Bacillus megaterium bacteria and the Trichoderma viride, Trichoderma. harzianum fungi were used. The results exhibited that, the highest percentage of preemergence damping off reduction, the maximum plant height and the maximum seeds weight per plant were recorded with Rizolex T and P. polymyxa followed by B. megaterium and T. harzianum treatments. Significantly increases in the percentage of survived plants compared with the control were found in all treatments. Number of branches, and number of pods per plants were the highest in the Rizolex T treatment. Quality parameters of the faba bean crops resulted, such as protein, protein digestibility and minerals (Fe and Zn), as well as, total flavonoid and antioxidant activity evaluations were significantly increased in P. polymyxa, B. megaterium followed by Rizolex T compared with control samples. Technological evaluation of density, ratio between cotyledons and seed coats, as well as, water absorption, hydration coefficients and swelling coefficients after soaking and cooking were studied and showed high levels in Faba beans treated with P. polymyxa, B. megaterium and Rizolex T. Also, high level of cookability (stewing) and sensory characteristics were detected in Faba beans treated with P. polymyxa, B. megaterium and Rizolex T compared with other treatments and control.