Effect of Arbuscular Mycorrhizal Fungus on Nitrogen Metabolism of Maize Seedlings under Low Temperature Stress

doi:10.7668/hbnxb.2014.04.036

Abstract

Abstract: We aimed to reveal the potential effects of AM fungi on low temperature resistance of host plants,and provide reference for developing biological fertilizer and promoting agricultural sustainable development.Using pot experiment,the influences of AMF inoculation to biomass,total nitrogen(N),NO₃^--N,NH₄⁺-N,protein,amino acid and relative N metabolism enzyme of maize seedlings were studied under low temperature stress.Study results showed that AMF inoculation increased aboveground biomass of maize seedlings compared with non-inoculation treatment under low temperature.Low temperature stress decreased total N,NO₃^--N and soluble protein content of maize leaf,and total N content of maize root,but increased NH₄⁺-N content of maize leaf and soluble protein content of maize root.AMF inoculation could increase total N,NO₃^--N and soluble protein content of unit mass maize leaf.At ambient temperature,AMF inoculation could increase NH₄⁺-N concentration of maize leaf,however at low temperature,AMF inoculation decreased NH₄⁺-N concentration of maize leaf.Low temperature decreased each amino acid and total amino acid content of maize root,AMF inoculation increased each amino acid and total amino acid content of maize root.Both AMF inoculation and temperature significantly impacted NR and GPT activity,however,GS activity only significantly was impacted by temperature,GOT activity only was impacted by AMF inoculation.Study results showed that low temperature intensely damaged the growth and N absorption metabolism of maize seedling.Under low temperature stress,AMF inoculation could improve physiological growth and N absorption metabolism enzyme activity of maize through personal N absorption and transportation,and further to increase low temperature resistance of maize seedlings.

Key words: Low temperature stress, Arbuscular mycorrhiza, Nitrogen metabolism, Maize seedlings

CLC Number:

CHEN Xiao-ying, SONG Feng-bin, ZHU Xian-can, SUN Lu-ying, MA Fu, LIU Sheng-qun. Effect of Arbuscular Mycorrhizal Fungus on Nitrogen Metabolism of Maize Seedlings under Low Temperature Stress[J]. journal1, 2014, 29(4): 205-212. doi: 10.7668/hbnxb.2014.04.036.

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