Effect of MWCNTs-COOH on Growth of Wheat Seedlings under Drought Stress
10%PEG was used to simulate drought stress,ultrapure water and 10%PEG solution treatments were used as non-drought treatment control(CK1)and drought treatment control(CK2),and the effects of different concentrations of carboxylated multiwalled carbon nanotubes(MWCNTs-COOH;10,20,40,80,160,320 mg/L)on the growth of wheat seedlings under drought stress were studied,so as to provide a theoretical basis and new approach for alleviating wheat drought stress.The results showed that with the increase of MWCNTs-COOH concentration,the wheat seedling height,fresh shoot weight,dry shoot weight,maximum root length,fresh root weight and dry root weight all first increased and then decreased under drought stress.The highest values were observed in the treatment with 160 mg/L MWCNTs-COOH.Compared with CK2,the treatment of 10-160 mg/L MWCNTs-COOH increased wheat seedling height,maximum root length,fresh shoot weight,dry shoot weight,fresh root weight and dry root weight under drought stress,promoting wheat growth,and the promoting effect on roots was higher than that on shoots;320 mg/L MWCNTs-COOH treatment reduced seedling height,fresh shoot weight and dry shoot weight under drought stress,and inhibited wheat growth.Analysis of physiological and biochemical indicators of wheat leaves and root activity showed that compared with CK2,the treatment with 160 mg/L MWCNTs-COOH increased the water content,relative water content,proline content and antioxidant enzyme activity of wheat leaves,decreased water saturation deficit and malonaldehyde content,and enhanced root activity.High concentration of MWCNTs-COOH(320 mg/L)led to the opposite development of various indicator values,and increased stress levels.The results indicated that low concentration of MWCNTs-COOH treatment could induce drought tolerance of seedlings by maintaining leaf water content and activating plant defense systems.In summary,appropriate concentrations of MWCNTs-COOH(10-160 mg/L)can promote the growth of wheat seedlings under drought stress,enhance drought resistance,and 160 mg/L MWCNTs-COOH treatment has the best effect;High concentration of MWCNTs-COOH(320 mg/L)has toxic effects on wheat seedlings under drought stress.
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