Influence of Different Tree Species on Nutritional Composition and Selenium Content of Epiphytic Dendrobium officinale
To explore the impact of different epiphytic tree species on the nutritional composition of Dendrobium officinale,this study focused on epiphytic D.officinale from eight tree species(i.e.Quercus glauca,Castanea spp.,Liquidambar formosana,Schima superba,Myrica rubra,Albizia julibrissin,Benincasa hispida,and Juglans regia)as well as their corresponding barks from Anlong.In addition,four essential nutrients and selenium content in D.officinale,as well as eleven mineral elements in the barks,were measured and subjected to correlation analysis.Through the SPSS software,principal component analysis(PCA)was performed on the four nutrients and selenium elements in D.officinale medicinal materials to reflect the differences in the quality of D.officinale medicinal materials cultivated in different epiphytic tree species.As shown by the results,there were significant variations in the influence of different mineral elements in the barks on the nutritional composition of D.officinale.The contents of Se was 20.3-49.7 pg/kg,extract was 7.2％-11.5％,polysaccharide was 23.7％-36.8％,total flavonoid was 23.6-49.9 mg/g,free amino acid was 0.3-6.8 mg/g,respectively in 8 species of epiphytic D.officinale.The results of principal component analysis showed that the three main components which had great influence on the quality of D.officinale were Se,polysaccharide and free amino acid.The comprehensive scores from PCA indicated the quality ranking of the eight D.officinale medicinal materials as follows:Schima superba,Castanea spp.,Albizia julibrissin,Liquidambar formosana,Myrica rubra,Juglans regia,Benincasa hispida,and Quercus glauca.Overall,the results of this study can provide scientific basis for the quality evaluation of D.officinale and the selection of its epiphytic tree species.
Dendrobium officinaleepiphytic plantnutritional componentsseleniummineral elements
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