بررسي مقاومت به سايه و خشكي گونه بومي چمن علف گندمي ﴿Agropyron deseturum﴾

چكيده انگليسي :

Assessment of Shade and Drought Tolerance of Wheat grass Agropyron deserturum Amir sadeghi Amir sadeghi@yahoo com January 23 2013 Department of Horticultural Science Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Assoc Prof N Etemadi Etemadin@cc iut ac irAssist Prof A Nikbakht anikbakht@cc iut ac irAbstractDrought and Low light issue and shadding though human constituents and also shading due to trees inlandscape are main problems in term of For resolution of such problems selection of resistant particularly native species and varieties to shade and drought is one of the most useful andrecommendable method This study was undertaken in 1390 91 in Greenhouse of Isfahan Universtiy ofTechnology during two experiments in order to evaluate resistance to shade and drought at differentlevels of shade of native species of Wheat grass Agropyron desertorum and digital type fescue Festucaarundinaceae The first experiment consisted of four level of shades 0 50 70 and 90 and two levels ofspecies was performed in frame of completely randomized design with 3 replicates The secondexperiment including three levels of shade 0 50 and 70 and two levels of irrigation no irrigation andfull irrigation was conducted in frame of factorial completely randomized design with three replications Analysis of data in both experiments was performed in form of compound variance The results of thefirst trial study of resistance to shade showed that shade increased height of both species delicateness ofleaves and reduced tillering Fresh and dry weight of roots and shoots in fescue species than Agropyronspecies showed more reduction with increasing shading severity photosynthetic rate of Tal fescue wasmore than Agropyron in full light but in relatively high 70 shade Agropyron had morephotosynthetic ability With increasing shade levels soluble sugar content decreased as that the fescuespeceies showend 46 reduction agains 21 reduction in Agropyron species Results of the second study Study of drought resistance in different shades showed that a contrasting shade and drought causereduction in negative effect of drought on leaf color and wilt in both species Reversibility percentage ofAgropyron species was more than Tal Fescue under 50 and 70 shade Agropyron species showed lessreduction in root fresh and dry weights than Fescue species in shade and drought conditions Also Agropyron showed low percentage of root mortality in 0 to 20 cm depth and 50 to 70 shade In droughtand ful light conditions Tall fescue produced more proline than Agropyron but in 70 shade theAgropyron produced more proline than Tall fescue In full light and drought conditions there was no anysignifincant difference between two species in term of production content of malondialdehyde In 50 shade Tall fescue produced less MDA than Agropyron but under 70 shade content of this compoundwas low in Agropyron Plants those were faced to drought Agropyron had more activity of Peroxidaseenzyme than Tall fescue It s expected that Agropyron species under irrigation and dorught conditionsable to tolerate shadding levels upto 70 while Tall fescue species may had acceptable efficiency upto50 shadding Keywords Agropyron Tall fescue shade drought proline malondialdehyde peroxidase

صادقي، امير

بررسي مقاومت به سايه و خشكي گونه بومي چمن علف گندمي ﴿Agropyron deseturum﴾

آگروپاپرون , تال فسكيو , پرولين , مالون دي آلدهايد , پراكسيداز