اثر تلقيح گياه ذرت با ريز جانداران محرك رشد بر برخي ويژگي هاي فيزيكي خاك و شاخص هاي رشد گياه در شرايط تنش خشكي

چكيده انگليسي :

109 Effect of Corn Inoculation with the Promoting Growth Plant Microorganisms on Some Soil Physical Properties and Plant Growth Indices in Water Stress Conditions Arman Pourraeisi arman pourraeisi@yahoo com december 16 2014 Department of Soil Science College of Agriculture Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Mozhgan Sepehri e mail msepehri@cc iut ac irAbstract Drought is the most common environmental stresses that limits crop production in 25 of agricultural lands inthe world s and is considered as the most important factor in reducing crop yield Soil aggregate stability is also animportant property which controls plant growth in arid and semi arid regions Therefore finding effectiveapproaches to increase plant resistance to drought and improve soil structure is of great importance Rootsinoculated with useful soil microorganisms can be considered as an effective strategy for reducing detrimentaleffects of stress and improve soil structure This research was conducted in research greenhouse of IsfahanUniversity of Technology to investigate the influence of individual and combined inoculation of endophyticfungus Piriformospora indica mycorrhizal fungi Glomus intraradices and plant growth promotingrhizobacteria Pseudomonas fluorescens on some growth parameters of maize single cross 704 and somephysical properties of soil series Khomeinishahr under drought stress Greenhouse experiment using a completelyrandomized factorial design with treatments including mycorrhizal fungi inoculated and non inoculated P indica inoculated and non inoculated bacterium inoculated and non inoculated and three levels of droughtstress 80 50 and 25 of available water were performed in tree replicates at Isfahan University ofTechnology The results showed that with increasing drought stress decrease of soil water from 80 AW to25 AW corn fresh and dry weights and shoot height decreased significantly in all treatments Reduced soilmoisture in control treatment decreased content of the phosphorus shoots of corn but the shoots potassium ofshoots and proline content of leaf in this treatment increased significantly Also soil water repllency WR andmechanically dispercible clay MDC significantly decreased by reducing soil water but water sorptivity andmean weight diameter of aggregate MWD increased Plant inoculation with mycorrhizal fangus at all levels ofdrought stress P indica only at the third level of stress 25 AW and bacterium at the first and second levels ofstress 80 AW and 50 AW increased significantly shoot dry weight in comparison to control Inoculation ofplant with mycorrhizal fungi at all levels of stress bacterium and P indica at the first and second levels of stress 80 AW and 50 AW increased shoot fresh weight compared to the control Individual inoculation withmycorrhizal fungi and bacterium significantly increased shoot height at all levels of stress While the height of theplants inoculated with P indica significantly increased only in the first and third levels of stress No significantdifferences were found between content of shoot potassium of inoculated plant with mycorrhizal fungi and controltreatment at all levels of stress But individual inoculation with bacterium and P indica significantly increasedconcentration of shoot K in compared to the control at the first and third levels of drought stress Plants inoculatedwith mycorrhizal fungi had higher phosphorus than control and plant inoculated individually with bacterium andP indica at all levels of stress While individual inoculation with P indica only at the third level of stress 25 AW and bacterium at the first and second levels of stress 80 AW and 50 AW significantly increasedshoot phosphorous content in comparison to control Individual inoculation with any studied microorganismssignificantly resulted in higher proline than the control treatment at all levels of stress The results showed thatmycorrhizal fungi at all levels of st

پور رئيسي، آرمان

اثر تلقيح گياه ذرت با ريز جانداران محرك رشد بر برخي ويژگي هاي فيزيكي خاك و شاخص هاي رشد گياه در شرايط تنش خشكي

قارچ ميكوريزا , باكتري هاي محرك رشد , قارچ پي اينديكا , پايداري ساختمان خاك , آب گريزي خاك