محمد مدرسی

Chamomile plant in the family Asteraceae is the most important and often cultivated as a medicinal. This plant faced with a shortage of secondary metabolits under heat stress. Heat stress is main factor affecting the rate of plant which causes the growth rate somewhat increase and then after that decrease. Given the role of mediator of heat stress by plant hormones; in this research effect of salicylic acid and jasmonic acid on morphological and biochemical characters of German Chamomile (Matricaria Chamomilla L. CV Bona) under natural normal and heat stress conditions, was studied. This experiment was carried out as completely randomized block design with 3 replication in a very hot area in field of Agriculture and Research Center located in Borazjan, Bushehr, Itan. Treatment of experiment in clouding four level salicylic acid (0, 12.5, 25, 50 mg.L-1) and four level jasmonic acid (0, 1, 1.5, 2 mg.L-1) was applied. Chamomile was cultivated two planting data normal and relay, was set in a way that more growth stages and flowering period faced with heat stress. The morphological triate included plant height, capitol diameter, flower wet weight, flower dry weight, flower dry matter and biochemical traite included essential oil and essential chamazulene was studied. The phytochemical traits were determined by Espectero photometery apparatus. Combined analysis of variance showed that interaction of the hormone salicylic acid and jasmonic acid on flower wet weight, flower dry weight, essential oil and essential chamazulene was significant. The interationbetween environmental conditions and salicylic acid and jasmonic acid on essential chamazulene was significant. Our findings showed that salicylic acid and jasmonic acid on secondary metabolites have been effected under heat stress.