Effects of zinc on carbon and nitrogen metabolism in leaves of Pinellia ternata and their yield / 中草药

ABSTRACT

Objective To find out the proper concentration of ZnSO4?7H2O as foliar fertilizer used for Pinellia ternata, and to provide reference for high yield of P.ternate,effects of zinc on the carbon and nitrogen metabolism in leaves of P.ternata and the yield were studied.Methods Seedlings of P.ternata were employed as the experiment material.At the stage of full seedling,ZnSO4?7H2O of different concentration was sprayed on the leaves,the indexes of carbon and nitrogen metabolism were determined on the day 10,the weight of tubers and bulbils were measured at the sprout tumble stage.Results The yield of P.ternata has an exceedingly significant positive correlation with the contents of soluble sucrose and starch in the leaves,a significant positive correlation with the content of photosynthetic pigment and the aldolase activity,and a negative correlation with the amylase activity.In addition,the yield shows both an exceedingly significant positive correlation whith the nitrate reductase activity and a significant positive correlation with the content of protein.At the stage of full seedling,zinc sprayed on leaves can increase the content of photosynthetic pigment and improve the capability of photosynthesis.Meanwhile,spraying zinc can also promote the accumulation of soluble sucrose and starch in the leaves because of its stimulation on aldolase and inhibition on amylase.Besides,spraying zinc on leaves could improve the activity of nitrate reductase and the content of protein,and finally increase the yield of P.ternata.Conclusion The concentration of 600 mg/L is the best for ZnSO4?7H2O used as foliar fertilizer for P.ternate at the stage of full seedling.