Effects And Physiological Mechanism Of DCPTA Application On Increasing The Cold Resistance Of Maize Seeding

Maize (Zea mays L.) originated in subtropical region and it belongs to thermophilic crops, thatis requires a high temperature environment. Heilongjiang is located in the northern temperaturezone，In recent years, it has become the most important maize-producing areas in China. Themaize production in Heilongjiang affects not only the development of economy and society of theprovince, but also the overall maize industry of China. Cold damage during the maize growing ismain natural disasters and limiting factor of maize high yield. All along, due to extreme weatherevents tend to frequent, chilling injury to become one of the major limiting factor of crop yield andstable yield. Therefore, need to study the development can improve maize chilling technology orproduct, Tertiary Amines active substances can regulate photosynthesis is a kind of high biologicalactivity with low molecular weight. DCPTA is a typical representative tertiary Amines activesubstances.DCPTA has physiological functions for increase production, improve quality anddisease resistance, stress tolerance on crop. In potted conditions, the maize as test material in thisstudy. From several aspects of maize biomass, photosynthesis system, active oxygen scavengingsystem, osmoregulation system research DCPTA raise maize seedling anti-cold physiologicaleffects and mechanisms.The major results were as followed:DCPTA ease the degree of inhibition of low temperature stress on seed germination andgrowth. Under low temperature stress, the dry biomass of root, stem and leaf was increase onefold by DCPTA processing, That suggested that DCTPA was a potential positive regulator toimprove the cold resistance of maize seeding.DCPTA treatment could significantly alleviate the impact of low temperature stress on thechlorophyll content and fluorescence parameters, F0has declined, Fv/Fm, Fv/F0, NPQ haveincreased. Increase the net photosynthetic rate of per unit leaf area and maize biomassaccumulation to improve the cold resistance of maize seeding.Under low temperature stress, DCPTA reduced the relative conductivity of leaves of maizeseedlings, maintain the stability of membrane system to improve the cold resistance of maizeseeding.Under low temperature stress, DCPTA improve the content of osmoregulation substances such as soluble sugar, soluble protein, etc. Enhanced osmoregulation of maize.On the one hand, DCPTA enhanced active oxygen scavenging capacity by Improve protectionof enzyme activity under low temperature stress. On the other hand, DCPTA reduced theaccumulation of MDA and other harmful substances to improve the cold resistance of maizeseeding.50mg/L DCPTA is best for enhanced cold resistance of maize seedling.