The effect of foliar application of nano iron chelated on antioxidant enzymes activity and yield of chamomile genotypes under drought stress conditions

In order to study the effect of foliar application of nano iron chelated on antioxidant enzymes activity and yield of chamomile genotypes under drought stress condition, a factorial experiment in randomized complete block design with three replications was conducted at greenhouse research farm of the University of Zabol in 2014. Experimental treatments included drought stress at 2 levels (control or 90% of field capacity and 70% of field capacity) and nano iron chelate at 2 levels (control and 2 mg/l) and genotypes, including: Isfahan, Mashhad, Shiraz, Kerman, Arak and Safashahr. The results showed that the drought stress according to the genotype had different effects on antioxidant enzyme activities so that the enzymes activities increased in some of the genotypes and decreased in some of them. The stress caused an increases in catalase activity in genotypes of Arak, Kerman and Safashahr, peroxidase and acrobats peroxidase activity in genotypes of Isfahan, Mashhad, Arak and Kerman, and polyphenol oxidase and guaiacol peroxidase in genotypes of Shiraz and was Safashahr. The highest the economic yield were observed in Esfahan genotype. Generally, it could be said that stress causes damaging effects on the plant and the use of nano-chelate increases the plant̕ s tolerance to stress and using Isfahan and Mashhad genotypes is suitable for stress conditions.