Effects of salt stress on physiological and biochemical indicators and total saponin accumulation of Platycodon grandiflorus(Jacq.)A.DC.
In order to study the effect of salt stress on the growth and development of Platycodon grandiflorus,the experiment was conducted with two-year-old Platycodon grandiflorus as test material,four treatment groups including control(CK,normal watering),low concentration salt stress(S1,200 mmol/L NaCl),medium concentration salt stress(S2,400 mmol/L NaCl)and high concentration salt stress(S3,600 mmol/L NaCl)were set up,the biomass,physiological and biochemical indexes and total saponins content of Platy-codon grandiflorus seedlings were determined.The results showed that salt stress inhibited the growth of Platycodon grandiflorus and reduced its biomass with the increase of salt stress concentration,and S1 could promote the increase of chlorophyll content of Platyc-odon grandiflorus,S2 and S3 decreased the content of chlorophyll,the relative water content of leaves decreased with the increase of salt stress concentration,the activities of antioxidant enzymes in leaves and roots of Platycodon grandiflorus decreased significantly at S3 and the 30th day after treatment.The contents of proline,MDA and total saponins in leaves and roots of Platycodon grandiflorus in-creased significantly with the increase of salt stress concentration and treatment time.This study can provide a theoretical basis for im-proving the growth,yield and quality of Platycodon grandiflorus in salt-alkali soil.
万方数据
维普
