Some physiological responses of pea (Pisum sativum L.) to high temperature stress.

Pea(Pisum sativum L) was a heat sensitive crop.To explore the physiological reasons of a decline in quality and yield under high temperature in pea,the effect of high temperature stress on pea seedlings were examined by measuring the electric conductivity,membrane lipid peroxide malondialdehyde(MDA),changes of Vc and length of hypocotyl in pea seedlings.The results showed that exposure to 42 and 44 ℃ resulted in increase in electric conductivity;that exposure to 40 and 44 ℃ resulted in increase in MDA,and decrease in level of Vc;that exposure to 44 and 50 ℃ resulted in decrease in hypocotyl lengation.Electrolyte leakage,membrane lipid peroxidation,decrease in antioxidant,and inhibition of hypocotyl growth might be some physiological reasons of a decline in quality and yield under high temperature in pea.