黑果枸杞对NaCl处理的生长及生理响应OA

Lycium ruthenicum is a xerophytic species with excellent adaptability to adverse environments.To reveal the growth and physiological response of L.ruthenicum under NaCl treatment,the seed germination,seedling growth(cotyledon diameter,hypocotyl and radicle length,fresh weight,dry weight,relative growth rate),K+and Na+content,osmotic potential,and photosynthetic indicators[(net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr),water use efficiency(WUE)]were assessed after being subjected to different NaCl[0(CK),50,100,200,300,and 400 mmol/L]treatments.The results showed that compared to the control,50 mmol/L NaCl strongly boosted the germination rate,diameter of cotyledon,primary root length,fresh weight,dry weight,relative growth rate,and significantly increased the Na+concentrations in roots,stems,and leaves;the concentration of Na+in leaves was significantly higher than that in roots and stems when adding 50-300 mmol/L NaCl(P<0.05);the K+concentrations in roots also increased significantly when exposed to 50−100 and 300−400 mmol/L NaCl.Moreover,external NaCl apparently increased the Pn,Gs,Tr and WUE(P<0.05).Compared with CK,the osmotic potential of the plants significantly decreased under 50–400 mmol/L NaCl treatments.It is speculated that moderate NaCl treatment could promote the growth of L.ruthenicum by regulating the Na+,K+content and photosynthesis,and resisted to salt stress by transporting Na+to leaves in L.ruthenicum.