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ABSTRACT
We have examined the influence of four phosphorus (P) levels on growth performance, photosynthetic efficiency and bioactive phytochemical production of Prunella vulgaris L. in hydroponic culture. Results that 0.20 mM P was enhanced the dry weight, shoot height, spica and root weights, spica length and number, total chlorophyll and carotenoid contents, net photosynthetic rate, transpiration rate, and stomatal conductance were determined after three months' treatment. A supply of surplus P resulted in a higher concentration of foliar P and was negatively correlated with biomass. Both P-deficient (0 mM) and high P (10.00 mM) resulted in increased concentrations of ursolic acid and oleanolic acid, with the exception of flavonoids. An increase in water extract from P. vulgaris spicas was noted with the application of increasing P concentrations. Our results indicated that the application of 0.20 mM P improves the biomass production and the yield of bioactive constituents of P. vulgaris.
Funding
This study was funded by the programs of the National Nature Science Foundation of China (Nos. 30772730, 81072986 and 31500263), Project funded by China Postdoctoral Science Foundation (2014M560726 and 2016T90869), Project Supported by Scientific Research Fund of SiChuan Provincial Education Department (13ZB0219) and Scientific Research Foundation of Chengdu Medical College (CYZ12-006; CYZ12-037) and Quality Guarantee System of Chinese Herbal Medicines (201507002).