Amino Acid: Its Dual Role as Nutrient and Scavenger of Free Radicals in Soil

2018-11-23 本站

题目:Amino Acid: Its Dual Role as Nutrient and Scavenger of Free Radicals in Soil


作者:Rahul Datta1, 2, * ,Divyashri Baraniya3,Yong-Feng Wang 4, Aditi Kelkar5,Ram Swaroop Meena6, Gulab Singh Yadav 7 ,Maria Teresa Ceccherini3,Pavel Formanek1

单位:1.Department of Geology and Pedology, Faculty of Forestry and Wood Technology, Mendel University,Brno 61300, Czech Republic; or;2.School of Environment & Natural Resources, Ohio State University, Columbus, OH 43210, USA; 3.Department of Agri-food Production and Environmental Sciences, University of Florence,Firenze 50121, Italy; (D.B.); (M.T.C.) ; 4.Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, Guangdong Academyof Forestry, Guangzhou 510520, China; or; 5.College of Professional Studies Northeastern, University, Boston, MA 02115, USA;;6.Department of Agronomy, Institute of Agricultural Sciences, BHU, Varanasi, Uttar Pradesh 221005, India;;7.ICAR Research Complex for NEH Region, Tripura Centre, Lembucherra, Tripura 799210, India;;*:Correspondence: or; Tel.: +420-773-990-283

摘要:Ascorbic acid is a bacteriostatic agent; one of the many ways by which ascorbic acidhampers bacterial growth is by the production of hydrogen peroxide, which further converts intohydroxyl free radicals. Certain amino acids can counteract the inhibitory effect of hydroxyl freeradicals by checking their oxidizing effect. Though ascorbic acid is bacteriostatic in nature, it facilitatesprokaryotic respiration by decarboxylation. This study was carried out to understand how microbesfrom different horizons of the forest soil respond to the addition of a bacteriostatic agent (ascorbic acid)and growth promoting agent (amino acids), with respect to the soil respiration. We observed that theaddition of either ascorbic acid or a combination of it with amino acid consistently results in increasedsoil respiration, and this increase is different for different soil types depending on soil compositionand origin. Furthermore, we also found that beta alanine-induced maximum respiration in basic soilsand L-glutamic in acidic soils. This study is significant because it can be used to explain how a strongreducing sugar, i.e., ascorbic acid, affects the soil respiration mediated via soil microbes. To the bestof our knowledge, it is the first report that demonstrates the effect of bacteriostatic and the growthpromoting agent together on microbe-mediated soil respiration.

关键词:bacteriostatic,ascorbic acid,free radical,decarboxylation,bete alanine,microbe