Effects of exogenous calcium on the growth and physiological characteristics of Glycyrrhiza uralensis Fisch.
[Objective]In order to reveal the adaptation mechanism of Glycyrrhiza uralensis in response to different calcium concentrations during high-efficiency cultivation in the arid zone of Ningxia,the present paper determined the effects of exogenous calcium on the growth,physiological and biochemical characteris-tics of G.uralensis,and to find out the appropriate concentration of calcium applied for licorice.[Method]The cultivated G.uralensis was used as the experimental material,and five levels of calcium concentrations were performed as follows:0(CK),5(G1),10(G2),15(G3),and 20 mmol/L(G4).The changes in growth,photosynthetic characteristics and antioxidant enzyme activities of G.uralensis were analyzed,and the optimal calcium concentration suitable for licorice growth was comprehensively evaluated by principal component analysis and subordinate function method.[Result]With the increase of calcium concentration,the main root length,main root diameter and fresh weight of root of G.uralensis first increased and then de-creased,and there was no significant difference among different treatments;the chlorophyll content,net pho-tosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs)and intercellular CO2 concentration(Ci)of G.uralensis leaves first increased and then decreased,the activity changes of superoxide dismutase(SOD),catalase(CAT)and peroxidase(POD)first increased and then decreased.When 10 mmol/L cal-cium concentration was applied,the Tr,Pn,Gs,SOD and CAT activities reached peak values,and the Pn,Gs were significantly higher than that of the control(P<0.05).The MDA content first decreased and then in-creased with the increase of calcium concentration,and there was a significant difference among different cal-cium concentrations(P<0.05).When the calcium concentration was 10 mmol/L,the MDA content was the lowest.The comprehensive evaluation results showed that the average value of subordinate function was the maximum at 10 mmol/L treatment,which was 0.739.[Conclusion]The exogenous calcium was beneficial to improve the growth,physiological and photosynthetic characteristics of Glycyrrhiza uralensis,the suitable calcium concentration for the growth of licorice was 10 mmol/L,which provided a theoretical basis for the cultivation pattern of G.uralensis in arid areas.
Glycyrrhiza uralensis Fisch.exogenous calciumphysiological characteristicssubordi-nate function methodprincipal component analysis
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