Effect of hormone priming and deterioration of seed germination characteristics and antioxidant enzymes activity in corn cultivars seed (Zea mays L.)

Deterioration of seed is one of the vigor reducer factors and germination limiting. An evaluation effective factors on seed deterioration is important. In order to determine the effect plant hormones on germination characteristics and antioxidant enzymes activity corn deteriorated seed the experiment was carried out at seed and biotechnology laboratories of College of Agriculture, Tehran University in 2015.This exam was designed with a factorial experiment based on completely randomized design (CRD) with four replications. The experiment treatment include varieties factor at 2 levels (704 single cross hybrid and 260 single cross hybrid), accelerated aging factor at 4 levels (0,5,10,15 day) and hormone factor at 2 levels (gibberellin hormone and cytokinin hormone). Seed deterioration  reduces germination indexes and reduces peroxidase and catalase enzymes activity.Treatments deterioraterd seeds with cytokinin and gibberellin increased antioxidant enzymes activity. The cytokinin hormone was more effective than gibberellin hormone in increasing the activity of antioxidant enzymes in deteriorated seeds. The results indicated seed aging decrease the activity of enzymes and plant hormones to tittle agronomy achievement reduced damage recovery using  low vigor seeds. 704 cultivar, with a higher vigor indicated amore enzyme activity than 260 cultivar.