Effect Of Seed Soaking With Chemical Regulators On Root Of Wheat Under Nacl And Drought Stresses

To study the chemical control substances on wheat under drought and salt stress regulatory role, the paper studies the impact which controlled substances are influential to wheat varieties under drought and salt stress regulatory role, using four kinds of controlled substances (uniconazole, salicylic acid, sodium nitrate, lanthanum carbonate) to soaking handle two different genotypes of wheat varieties ('Linfen 8050 'and' temporary drought 536'). Main results are as follows:(1) Between four kinds of controlled substances in osmotic stress conditions, uniconazole and salicylic acid are the first to promote the role of inhibition. Sodium silicate and lanthanum nitrate are expressed as the promotion of shoot growth, but the impact on the underground parts was not significant. Under osmotic stress conditions, the four kinds of controlled substances could be reduced by MDA content which is harmful, thereby reducing hazards of which the osmotic stress increase wheat seedlings MDA; to increase of proline and soluble sugar's. All these will enhance the adaptation the plant under osmotic stress; the activities of a variety of enzymes also increase. Therefore, salt-of-control material is able to mitigate the toxic effects of stress on wheat. The adaptability the two species is in different controlled substances has some differences.(2) Field drought tests showed that a variety of controlled substances in the form of wheat, the role of indicators in effect of the wheat seedling remarkable. Turn green after a period of different treatments on the morphological indexes smaller. Several of controlled substances or processing of the output can increase. Its production is mainly due to increase in the total spikes and grain weight increases. For the MDA of hazardous substances, in the early stage of wheat seedlings and the highest levels of maturity. For soluble sugar and proline was increased gradually with the growth of wheat; a variety of activity and content of active substance has shown first and then decrease features.(3) Salt stress hydroponic experiment results showed that, the four kinds of chemical control substances to treat wheat seeds are able to mitigate the NaCl stress effects on wheat injury, indicating the material through the regulation of seed soaking a way to improve the feasibility of wheat salt tolerance. The two wheat varieties adaptable to different drugs, there are differences.(4) Along with the increase in salt concentration of wheat seedlings showed morphological characteristics of restrained, plant height, split-root number of tillers, root length, leaf area, biomass decreases; shoot ratio increased, indicating salt stress increase is greater than the impact of the underground part of the aerial part. Sodium silicate, lanthanum nitrate can be varying degrees of increased height, split-root number of tillers, root length, leaf area, biomass, indicating that it can alleviate the damage caused by salt stress. Uniconazole, salicylic acid to plant height, leaf area, biomass decreased, leaving sub-root number, tillering, root length, root to shoot ratio increased, suggesting that the two substances by promoting the growth of the underground sections of the aerial parts inhibited the growth of The enhanced salt resistance.(5) Salt stress on two varieties of wheat seedlings for root length, root to shoot ratio, proline, root activity, CAT activity increased, indicating low salt stress on crops through their own adjustment to improve concentration or activity of active substances, which enhance the salt resistance. Uniconazole after soaking chlorophyll content, proline content, root activity, SOD activity, CAT activity, POD activity were significantly or significantly higher than control group; MDA content was significantly reduced. Therefore, uniconazole soaking active substances by increasing the activity and reduce levels of harmful substances to improve the salt resistance of wheat.(6)Soluble sugar content in the salt-stress test has the effect of various chemical control substances did not change significantly, but the osmotic stress and drought stress on soluble sugar content increased significantly, chemical control of material can also significantly increase the soluble sugar content. Therefore, soluble sugar content may be related to drought resistance of wheat has nothing to do with the salt resistance.