Effect of foliar applications of gibberellic acid, indole acetic acid and salicylic acid on faba bean growth, yield and chocolate spot disease severity [electronic resource].

Includes reference

Field experiment was conducted at the two successive seasons 20111/2012 and 2012/2013 to study the effect of salicylic acid (SA), gibberellic acid (GA3) and indole acetic acid (IAA) singly (SA) or in combinations at the concentrations of 10-4, 10-5 and10-6 M on faba bean, vegetative growth, yield components and some biochemical constituents in correlation with chocolate spot disease incidence. Foliar applications of GA3 and SA+IAA at10-5 M had significant effect in increasing plant height, fresh and dry weight of shoots in both seasons as compared with those of control. Moreover GA3, IAA and SA+IAA at 10-5 M recorded the maximum responses in most parameters of both plant growth and yield components, i.e. plant height, number of branches/plant, number of pods/plant, number of seeds/plant, weight of seeds/plant 100-seed/Weight and seed yield/fed. Generally, the contents of chlorophyll a, chlorophyll b and total chlorophyll, peroxidase activity and total phenol content were significantly the highest in response to the applications of SA, GA3 and IAA singly or in combinations at 1 0:., and1o-5 M, compared to nontreated control. Crude protein and total carbohydrates were increased significantly at 10-4 or 10-6 M. Application of fAA and SA+GA3 at 10-5 M resulted the highest values of protein with the average of 26.38 and 25.88% and carbohydrate with the average of 56. 85 and 58.32%, respectively. Key words: Growth regulators, salicylic acid, faba bean, chocolate spot, peroxidase, total phenol.

Summary in arabic.

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