Study On The Growth Law Of Fagought Respyrum Tataricumwith Different Droistance Under Different Water Conditions

In order to find out the relationship between root morphology,physiological indexes,endogenous hormones and drought resistance of different drought-resistant Fagopyrum tataricum in order to provide a theoretical basis for the selection of drought-resistant varieties and management of high-yield and quality Fagopyrum tataricum under drought stress.Artificial water control and intensive sampling(samples taken every 10 days)were used to study the plant morphological indicators of the drought-resistant Fagopyrum tataricum’Diqing Tartary Buckwheat’ and ’Heifeng No.1’ with different drought resistance against normal drought and drought.,Root physiological indicators,endogenous hormones and yield.(1)Drought stress resulted in significant increase in root-shoot ratio,root MDA,Pro content,SOD activity,POD activity,and ABA content,while maximum root length,root volume,root surface area,plant height,leaf area,stem thickness,Root activity,chlorophyll,soluble protein,soluble sugar,and IAA content were significantly reduced.But the rise and fall of different varieties are different;(2)The results of analysis of variance between varieties showed that under severe drought stress,the root-shoot ratio,maximum root length,root volume,root surface area,plant height,leaf area,stem thickness,ABA,IAA,POD,SOD,Root activity,Pro,and chlorophyll values were significantly higher(P﹤0.05)than Heifeng No.1;MDA content was significantly lower(P﹤0.05)than Heifeng No.1.(3)Studies on the yield composition at maturity stage showed that the number of branches,100-grain weight and yield of Fagopyrum tataricum significantly decreased due to water stress.It is significantly higher than the drought-sensitive variety Heifeng No.1 and shows a higher amplitude under drought stress(69.7% in drought and 14.9% in normal water),indicating that under drought Should choose to plant drought-resistant buckwheat varieties.(4)Studies on the yield composition at maturity stage showed that the number of branches,100-grain weight and yield of Fagopyrum tataricum significantly decreased due to water stress.However,under different water conditions,the yield of drought-resistant Fagopyrum tataricum variety Diqing buckwheat was all It is significantly higher than the drought-sensitive variety Heifeng No.1 and shows a higher amplitude under drought stress conditions(69.7% higher under drought conditions and 14.9% higher under normal water conditions),indicating that under drought stress conditions,Should choose to plant drought-resistant Diqing buckwheat varieties.(5)Regression analysis fitting equations show that the mathematical models of the surface area,maximum root length,and soluble protein of tartary buckwheat with different treatments during the measurement period conform to the exponential function;root volume,MDA,root vitality,POD,SOD,soluble sugar,IAA content and other indicators conform to the one-element quadratic equation;plant height,stem thickness,ABA content and other indicators are more in line with the general linear equation,the growth inflection point is predicted by the equation.The growth of tartary buckwheat roots and above-ground parts was inhibited under drought stress,and both showed greater effects on the above ground than the roots;regardless of whether the varieties were drought-tolerant or not,drought stress had a greater effect on flowering,and Fagopyrum tataricum planting could be adjusted Time overlaps the flowering season with the local rainy season to reduce the drought stress of Fagopyrum tataricum.At the same time,it was found that when the tartary buckwheat grains mature,the stems continue to branch out,indicating that the root system has vitality and can continue to provide nutrients to make the grains fuller.