Effects of Combined Application of Auxin and Molybdenum on Physiological Metabolism and Quality of Upper Leaves of Flue-cured Tobacco
In order to explore the effects of auxin and molybdenum on the physiological metabolism and quality of flue-cured tobacco,a field experiment was conducted to measure the photosynthesis,carbon and nitrogen metabolism,physical properties and chemical composition by using the cultivar'Yunyan 87'as material.The results showed that compared with the control,the application of auxin and molybdenum after topping increased the contents of photosynthetic pigments(chlorophyll,carotenoids),the values of gas exchange parameters(net photosynthetic rate,stomatal conductance,transpiration rate)and the enzymes activities of carbon and nitrogen metabolizing(amylase,invertase,nitrate reductase,glutamine synthetase);the leaf length,leaf width,single leaf weight,filling value,tensile strength,potassium,total sugar and reducing sugar contents increased significantly,while the contents of nitrogen and nicotine decreased significantly.The total variation contribution rates of auxin and molybdenum to photosynthetic pigments of tobacco leaves were 68.85%,13.23%,respectively;to the gas exchange parameters were 50.66%and 42.63%,respectively;to the rates of carbon and nitrogen metabolizing enzymes were 40.74%,34.02%,respectively;to the rates of physical properties were 46.72%,49.55%,respectively;to the rates of chemical composition were 54.94%,36.22%,respectively.On the whole,auxin was the main effector molecule,the treatment of spraying 20 mg·kg-1 auxin and 4 mg·plant-1 molybdenum had the best effect on tobacco for promoting physiological metabolism and improving quality.The above results provided a theoretical basis for the rational application of hormones and trace elements in flue-cured tobacco production.
auxinmolybdenumflue-cured tobaccocarbon and nitrogen metabolismquality
万方数据
维普
