9493

8775

كارشناسي ارشد

كشاورزي- علوم باغباني

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1393

سيزده،104ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

مريم حقيقي

اميرحسين خوش گفتارمنش

1/11/93

مصطفي مبلي، حسن كريم مجني

مهندسي كشاورزي

ID8775

105 The Effect of Root Zone Temperature on N Metabolism Growth and Physiological Characteristics of Lettuce and Sweet Pepper in 3 N Withholding Levels in Early Growth Stage Atena Sheibanirad atena sheibanirad@hotmail com September 15 2014 Department of Horticulture College of Agriculture Isfahan University of Technology Isfahan 84156 83111 Iran FarsiDegree M Sc Language Supervisor Maryam Haghighi mhaghighi@cc iut ac ir AbstractConsidering increasing world population vegetables cultivation also increased So that plants faced with different temperature nutritional and climatic situation which caninduced various stresses for plants Stress intensity related to the plant s type andrecovery ability under unfavorable condition In order to evaluate the effect of of plantsunfavorable root temperature and nitrogen starvation lettuce and sweet pepper plantsselected and this study conducted in factorial experiment based on control randomizeddesign CRD with five replications for each treatment in greenhouse of IsfahanUniversity of Technology with 3 nutrient treatment 100 75 and 50 precent of Johnsonnutrient solution and 3 root zone temperature 15 C 25 C and 35 C Resultsdemonstrated that by reducing nitrogen concentration in both plants under 35 C roottemperature nitrogen absorbtion and urea and nitrate concentration increased Furthermore in 25 C and 15 C root temperature higher amount of phosphorous andpotassium with reduce of nitrogen observed The highest plant biomass was in optimumroot temperature and 100 Johnson nutrient nitrogen concentration By nitrogendiminishing plants growth decreased Phenolic compound of root exudate and shootextract increased in 25 C root temperature and 15 C root temperature by reducingalthough only in lettuce only in 15 C root temperature an acceptable amount ofphenolic compound produced in lettuce Chlorophyll value by decreasing nitrogenconcentration decreased in all root temperature and this reduction was more obvious in35 C root temperature treatments Photosynthesis rate in all nitrogen concentratin of15 C root temperature in sweet pepper and 35 C root temperature in lettuce werehigher than other treatments The highest transpiration of lettuce in 50 Johnsonnutrient nitrogen concentration in all root temperature and in 15 C root temperature inall N levels in sweet pepper observed Eventually concluded that nitrogen metabolismlimited less under nitrogen deprivation and high root zone temperature and low rootzone temperature has more destructive effect in both evaluated plants Although bothunfavorable temperature and nitrogen deficiency reduced yieldKey WordsNitrogen metabolism Root temperature Nitrogen deprivation Temperature stress

مريم حقيقي

اميرحسين خوش گفتارمنش

مصطفي مبلي، حسن كريم مجني