بررسي مقاومت به شوري رقم هاي مختلف چمن آبي ﴿Poa pratensis L.)

چكيده انگليسي :

Evaluation of Salinity Tolerance of Kentucky Bluegrass Cultivars Ebrahim Kiani e kiani 1983@gmail com 2011 Department of Horticultural Science Isfahan University of Technology Isfahan 8415683111 IranDegree M Sc Language FarsiSupervisor Assist Prof N Etemadi etemadin @cc iut ac irAbstractTurf is one of the most important ground covers and it is one of the main elements of landscape designing It coverssoil surface and provide a pleasant enviroment Iran is one of the driest countries in the world and dry condition hasrsulted in soil salinity Farthermore a lot of water resources are salty Therefore it is important to select salt tolerantturfgrass for planting in landscap The purpose of this expriment was to determine the relative salt tolerance of tenKentucky bluegrass cultivars Ampellia Park Harmony Merion Crusade Nutop Balin Challanger Geome andBanf A factorial expriment based on completely randomized design with 6 salinity level 0 3 1 5 3 4 5 6 and 7 5ds m and ten cultivars of Kentucky bluegrass with trhee replicatios was conducted in the Isfahan University ofTechnology The analysis of variance showed that the effect of cultivar salinity and their interaction weresignificant at 1 The results also showed that shoot and root dry weight leaf water contet LWC and turfgrassquality reduced as salinity leval increased whareas leaf firing of turfgrass increased Ampellia Park and Harmonyproduced the highest of shoot and root dry wheight whareas the Banf and Nutop produced the lowest Ampellia andPark had maximum while Banf and Crusade the minimum leaf water content LWC The highest turfgrass qualitywas recorded in Ampellia and Harmony while the lowest quality was found in Banf and crusade Ampellia showedthe least leaf firing followed by Harmony whareas Banf and Crusade showed the highest leaf firing respectively Banf produced the highest but Park produced the lowest proline contents Though chlorophyll content reduced assalinity level increasd the reduction was lowest in Ampellia and highest in Banf As salinity level increased Na nad Cl contents increased while K reduced However Ampellia showed the lowest Na nad Cl contents whareasBanf showed the highest The correlation study between traits showed that with increasing proline content of leaves turfgrass quality shoot dry weight root dry weight and water content percentag significantly reduced also turfgrassleaf firing increased proline production rate was higher in the sensitive cultivars of this species that probably couldbe as an index of stress level and plant health It was state also found that along with increasing salt sodium andchloride of shoot was increased that caused leaf firing and reduced turf quality It seems Sodium and chlorideaccumulated under salinity is one of the major reasons for the reduction in growth indices the observved differencebetween cultivars could be due to the ability of some cultivars in ion excertion such as sodium and chloride fromshoot More potassium uptake in shoot could also reduce salinity damage It was concluded the more potassium wasaccumulated in shoots the lower the salinity damage was and decrease leaf firing ratio of potassium to sodium inthe leaves were more important that their individual concenteration Based on overall measured parameters in thisstudy Ampellia was the most salt tolerant cultivar followed by Harmony Park and Nutop respectively Moreover Na Cl and the ratio of shoot K Na could be used as selective criterion for salt tolerance evaluation amongturfgrasses Also the results showed that there was a wide variation among cultivars for their salt tolerance therby selection for more salt tolerant among the cultivars is possible Keywords Turfgrass Cultivar Salinity K Na ratio Chlorophyll

كياني، ابراهيم

بررسي مقاومت به شوري رقم هاي مختلف چمن آبي ﴿Poa pratensis L.)

نسبت پتاسيم به سديم , كلروفيل