摘要：The ability of alternative treatments including {B acillus subtilis, B acillu s chitinospora chitinosporus and yeast extract), benzothiadiazole {BTH), salicylic acid and oxalic acid as well as fungicide propiconazole were investigated for their ability to improve physiological characters, resistance and yield production in the susceptible Egyptian wheat cultivar {Gemmiza-7) compared to the resistant cultivar {Misr-1) under leaf rust disease stress. In vitro, all treatments decreased spore germination, disease symptoms, disease severity % and number of uredia compared with control infected for the susceptible cultivar. Antioxidant enzyme activities [catalase (CAT), peroxidase {POX) and polyphenol oxidase (PPO)] were significantly increased in susceptible-infected wheat cultivar that was treated with bio-agents, BTH, salicylic acid and oxalic acid treatments as compared with the control treatment. Chlorophyll concentration was significantly decreased in the susceptible-infected cultivar. The electrolyte leakage percentage was significantly decreased in susceptible infected treated cultivar compared to susceptible infected untreated cultivar. Accordingly, the treatments were able to increase chlorophyll concentration and improve yield component such as weight of grains in 10 spikes and thousand grains weight.
