اثر ترينگزاپك اتيل بر خصوصيات ظاهري و مقاومت به سرماي سه رقم چمن برموداگراس

چكيده انگليسي :

Effect of Trinexapac ethyl on Visual Quality and Cold Tolerance of Three Bermudagrass Cultivar Shekofeh farahmand shfarahmand@yahoo com 2011 Department of Horticultural Science IsfahanUniversity of Technology Isfahan 8415683111 IranDegree M Sc Language FarsiSupervisor Assist Prof N Etemadi etemadin @cc iut ac irSupervisor Assist Prof B Baninasab b banin@cc iut ac irAbstractTurfgrasses are monocotyledonous plants from the Poaceae Gramineae family and they are one of themajor factors in landscape design Bermudagrass Cynodon dactylon is one of the most important Turfgrassin warm season and since It is valued for their drought tolerance and salinity Bermudagrass are frequentlyused in temperate regions Bermudagrass also used in transition zone in this plant growth rate was increasedin high humidity low resistance to freezing couses damage to cynodon dactyloncold This damage will bemore intensive in compact areas such us golf ground low clipping level and heavy traffic Plant growthregulator have an appropriate role in program turfgrass management plant growth inhibitors and growthretardants appliction in grasses would reduce the vegetative growth improve the root density color qualityand would increase the photosynthetic rates respiration decrease and resistance to biotic and abiotic stresses Trinexapac ethyl is one the retardants that used in recent year Regarding to sensitivity of Bermudagrass tolow temperature and its importance in landscape therefore we studied the effects of different concentrationsof Trinexapac ethyl on the morphological characteristics increase of cold tolerance in three varieties ofBermuda grass and introduced one variety which has short dormancy duration So this research was done withsplit plot factorial in time by Randomized complete block design method with three replications and eachreplication consist of two pots and three varieties of Bermuda grasses named Regles Tifway and Tifdwarf inresearch training greenhouses of Agricultural department in Isfahan university of technology Treatmentsincluded four concentrations 0 4 6 12 mg m2 of Trinexapac ethyl were used monthly in September October and November 1388 and from March to October of 1389 During this period factors such as height color wet and dry weight were measured regularly The amount of Proline was measured twice in Novembermonths of 1388 and 1389 when weather was getting cold To study the Rhizomes survival in late January andFebruary in 1388 Rhizomes were transferred to incubator at low temperatures and percent survival ofrhizome was measured after get out of the incubator and planting in pots At the end of the test and afterremoval of plants from spots the root densiy depth wet and dry weight of roots were measured Trinexapac ethyl compared to control reduced the growth rate and height root in all three varieties however anysignificant differences were not observed between these concentrations The most reduction in grass heightwas seen in Tifdwarf variety applictionTrinexapac ethyl hormones in all three varieties increased the amountof Proline compared to control Based of this result the Maximum amount of proline was observed inTifdwarf applictionTrinexapac ethyl did not show any significant effects in increasing of color in Novemberand March time These results show that there is not any significant difference between these hormoneconcentrations and control in survival of Rhizomes The use of this hormone caused increases in depth of rootdensity wet and dry weight in roots and the results showed that the concentration of 12 mg m2 hormonewas more effective Keywords Cynodon Cynodon dactylon Trinexapac ethyl resistance to cold conditions

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اثر ترينگزاپك اتيل بر خصوصيات ظاهري و مقاومت به سرماي سه رقم چمن برموداگراس

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