Effect of Single-walled Carbon Nanotubes on Growth and Development of Wheat Seedlings Under Potassium Stress
To explore the biological effects of carboxylated single-walled carbon nanotubes(SWCNTs-COOH),this work selected"Pinyu 8012"wheat as the experimental material and used hydroponics cultivation method to investigate the effects of various concentrations of SWCNTs-COOH(0,5,10,30,50,70,and 90 mg·L-1)on the growth and development of wheat seedlings under low potassium stress(K+,0.01 mmol·L-1).With the most nota-ble impact being observed at a concentration of 50 mg·L-1,the results revealed that SWCNTs-COOH concentra-tions ranging from 5 to 50 mg·L-1 positively affected growth parameters(plant height,root system,leaf area,fresh weight,dry weight),photosynthetic indicators(cytochrome content,chlorophyll fluorescence parameters),and an-tioxidant enzyme(SOD,POD)activities in wheat seedlings.However,at doses of 70 mg·L-1 or higher,growth in-dicators,photosynthetic parameters,SOD activity,and POD activity in wheat seedlings dropped while the malondial-dehyde(MDA)content rose dramatically.This implies that high quantities of SWCNTs-COOH exacerbate the toxi-cological effects of low potassium stress on wheat.In summary,there is a significant concentration effect of SWCNTs-COOH on the growth and development of wheat seedlings under low potassium stress.Low concentra-tions of SWCNTs-COOH can help to reduce some of the low potassium stress-induced damage in wheat seedlings,while high concentrations of SWCNTs-COOH can cause certain physiological toxicity to wheat seedlings.
carboxylated single-walled carbon nanotubeswheatphysiological toxicitypotassium stressgrowth and development
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