4833

4552

كارشناسي ارشد

خاكشناسي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1388

سيزده،92ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

فرشيد نوربخش

آقافخرميرلوحي

17/9/88

مهران شيرواني، محمدرضا سبز عليان

1396/09/22

كتابنامه

مهندسي كشاورزي

ID4552

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

The Response of Tall Fescue Residue Decomposition Kinetics to Endophyte Neotyphodium coenophialum Symbiosis Somayeh Ghasemi ghasemi s @yahoo com July Department of Soil Science Collage of Agriculture Isfahan University of Technology Isfahan Iran Degree M Sc Language Farsi Dr F Nourbakhsh farshid@cc iut ac ir Abstract Plants have developed mutualistic symbiosis with diverse organisms for their mutual benefit The symbiosis between fungal endophyte Neotyphodium coenophialum and the cool season grasses tall fescue Festuca arundinacea Schreb represent a widespread type of mutualism Infected plant express increased tolerance to biotic and abiotic stresses which may result in better persistence Some of the benefits derive primarily from the production of toxic alkaloids by the endophyte within the host plant Therefore in the presence of endophyte greater plant production capability could lead to greater C input to soil Moreover residue quality can be changed by the presence of endophyte metabolites i e various alkaloids and phenolics produced by the endophyte association The bio chemical characteristics of plant residues are important factors that governing residue decomposition in soil Therefore the objectives of this study were to investigate i the effects of tall fescue genotype on residues quality C and N mineralization kinetics and some of the soil biological properties ii the effects of endophyte symbiosis on tall fescue residues quality C and N mineralization kinetics and some of the soil biological properties For these purposes soil samples were collected from to cm depth Chamaseman and Shervedan research stations Two tall fescue genotypes B and C either infected by their natural fungal endophyte N coenophialum E or their non infected isolines E were chosen in this experiment Soil samples were mixed thoroughly with tall fescue plant residues including BE BE CE CE at the rate of g C kg soil and incubated at C and WHC The C mineralization kinetic was monitored during days and some of the biological properties were evaluated after months of incubation Results indicated that C cellulose hemicellulose and lignin concentrations were higher in the residues of E than E In contrast N concentration was lower in the E residues The cumulative amounts of organic C mineralized in all treatments were non linear over time The influence of endophyte on C mineralization was time dependent so that the decreasing effects of endophytes increased with time Furthermore in the both tall fescue genotype net N mineralization immobilization Nm i net changes of amino acid concentration and arginine ammonification were significantly lower in E treatments Tall fescue genotype and endophyte status did not affect the enzyme activities in both soils To study the kinetics of N mineralization and amino acids plant residues of BE and BE were added to Shervedan soil and the soils were incubated for week under the optimum conditions Nitrogen immobilization was observed in the first weeks of incubation followed by N mineralization In the Chamaseman soil Nm i was significantly correlated with N concentration r C N r and lignin N r ratio of the plant residue pdfMachine is a pdf writer that produces quality PDF files with ease Get yours now Thank you very much I can use Acrobat Distiller or the Acrobat PDFWriter but I consider your product a lot easier to use and much preferable to Adobe s A Sarras USA

فرشيد نوربخش

آقافخرميرلوحي

مهران شيرواني، محمدرضا سبز عليان