Interaction of water deficit stress and salicylic acid on yield and component yield of two cultivars wheat

This experiment was conducted in the research station of Islamic Azad University- Arak Branch، Iran in 2009-2010. The experimental design was split plot factorial based on randomized complete blocks design with four replications. The treatments including of water deficit stress in three levels: complete irrigation، cut-irrigation at milk stage and Cut-irrigation at dough stage in were assigned to main spilt and salicylic acid (without and with using equal to 1 Mm as seed priming) and cultivars including of Alvand and Shahriar as factorial were randomized to sub plot. Results showed that cut-irrigation at milk and dough stage reduced grain yield by %24 and %15 respectively. Application of salicylic acid in complete irrigation، cut-irrigation at milk and dough stage increased grain yield by 7. 2، 7 and 8. 7%. Effects threefold of treatments showed that، highest grain yield equal 3698kg ha-1 obtained from interaction of complete irrigation، with salicylic acid and Alvand cultivar، but in condition of cut-irrigation highest grain yield equal 3378 kg ha-1 obtained from interaction of cut- irrigation at dough stage، with salicylic acid and shahriar cultivar. The results of experiment showed that salicylic acid application may be decreased effects of water deficit.