In order to investigate the physiological mechanism of salt tolerance in the seedlings of cut flower Gerbera jamesonii'Curtis Cream'and'Anna',G.jamesonii seedlings as object,using NaCl solutions of different concentrations(0 mmol/L,100 mmol/L,125 mmol/L,150 mmol/L,200 mmol/L,100 mmol/L)to simulate the saline soil,its effects on the growth and physiological characteristics of G.jamesonii seedlings were studied.The results showed that low salt stress stimulated the leaves of G.jamesonii'Curtis Cream'and'Anna'seedlings at NaCl concentrations of ≤100 and≤ 125 mmol/L,respectively,and promoted the accumulation of reactive oxygen species(ROS)in the plants by increasing the activities of protective enzymes such as superoxide dismutase(SOD),peroxidase(POD)and catalase(CAT),and maintaining the stability of the plasma membrane.It maintained the stability of the plasma membrane,maintains normal osmotic balance and cellular metabolism,and promoted the increase of fresh weight and chlorophyll contents of G.jamesonii above and below ground.When the NaCl concentrations were≥125 and ≥ 150 mmol/L,respectively,the high salt stress led to excessive accumulation of reactive oxygen species in the plants,and the contents of malondialdehyde(MDA)increased rapidly.The osmotic balance of metabolism was broken,resulting in cellular water loss and serious inhibition of the growth of G.jamesonii seedlings.Therefore,G.jamesonii'Curtis Cream'seedlings could tolerate ≤ 100 mmol/L NaCl stress,and'Anna'seedlings could tolerate ≤125 mmol/L NaCl stress.
关键词
非洲菊/单盐胁迫/生长发育/抗氧化酶/渗透调节物质
Key words
Gerbera jamesonii/single salt stress/growth and development/antioxidant enzymes/osmoregulation substances
维普
万方数据