Effects of Different Ionic Concentration on Plant Growth and Photosynthetic Characteristics in Virus-free Potato by Hydroponic System
Effects of different ironic concentration of nutrient solution on the growth and photosynthetic characteristics of potato were analyzed to clarify the physiological mechanisms of adaptability of virus-free potato,which would provide a theoretical basis for the potato cultivation under hydroponic system.Taken early maturing variety ‘ Yushu No.5’ and late season variety ‘ E’shu No.1'as plant materials,the effects of different ironic concentration of nutrient solution on growth and development,root activity,photosynthetic characteristics and chlorophyll fluorescence of virus-free potato by hydroponic were studied.The result showed that the numbers and production of micro-tuber per plant were the highest at an integrate ionic concentration of 3475.00 mg · L-1 (EC =2.91 ms · cm-1) compared with ultra treatments;During tuber expansion period,the root activity,net photosynthetic rate (Pn),maximal photochemical efficiency (Fv/Fm),actual photochemical efficiency (φPS Ⅱ),electron transport rate (ETR) and photochemical quenching (qP) of this treatment were all increased as well.Under high ironic concentration of 4248.51 mg · L-1,the vegetative growth and chlorophyll synthesis were promoted,and the number of stolons per plant were increased,but the tuber initiation was inhibited,and the stage of tuber formation was delayed;With low concentration of nutrient solution (C≤2124.26 mg · L-1),the early initiation and formation of tuber,but leaf area per plant,root activity,Pn,Fv/Fm,φPS Ⅱ,ETR,qP and numbers of stolons per plant were all decreased significantly so that the production of micro-tuber was reduced.Optimum ionic concentration of nutrient solution was 3475.00 mg · L-1 (EC =2.91 ms · cm-1) in the whole period;Improving the ionic concentration in vegetative period and reducing during tuber expansion period was a key method to raise the yield of micro-tuber by hydroponic.
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万方数据
维普
