Effects of nutrients deficiency on growth and saponin accumulation of Panax quinquefolium
【Abstract】Mineral nutrient elements are the key factors to maintain the growth and quality of Panax quinquefolium. In order to understand the comprehensive effect of different nutrient elements deficiency on P. quinquefolium, 2-year-old P. quinquefolium samples were cultivated by Hoagland complete nutrient solution (CK) or 10 different nutrients deficiency solution in sand culture. During the cultivation, the deficient symptom was observed. The plant height, leaf area, biomass, photosynthetic indicator, root activity, ginsenoside content were measured. The results showed that N, K or Fe deficiency could lead to leaves of P. quinquefolium yellowing. N, K, Ca, Mg and B deficiencies were the main factors decreasing plant height and leaf area. The biomass of plant decreased significantly in all the nutrient deficiency treatments (P < 0.05) compared with that in the control group, and that in the N, K, Ca or Fe deficiency groups descended over 50%. In the absence of N, K and Fe elements, the Pn, Gs, Ci, Tr and chlorophyll of leaves were decreased mostly. The first three factors decreasing root activity were N, K and Ca deficiencies. The effects of nutrient deficiency on saponins of P. quinquefolium were different. Generally, N, P, B, Zn and Cu deficiencies resulted the synthesis of saponins decreased significantly (P < 0.05). This study contributed to clarify the demand characteristics of P. quinquefolium for different nutrient elements, which is of great significance for the diagnose of nutrient deficiency, the rational fertilizer and the improvement of yield and quality of P. quinquefolium.
【Keywords】 P. quinquefolium; nutrient deficiency; symptom; growth; physiological characteristic; saponin;
(Translated by ZHAO B)
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