5683

5305

كارشناسي ارشد

زراعت

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1389

هشت،62ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

پرويز احسان زاده

مصطفي مبلي، مرتضي زاهدي

17/12/89

علي اكبر رامين، حسن كريم مجني

مهندسي كشاورزي

ID5305

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

63 Effect of Water Deficit Stress and Nitrogen on Yield and Some Physiologic Parameters of Oilseed Pumpkin Cucurbita pepo L Amir Hussien Aghaei aaghaei1984@gmail com July 20 2010 Department of Agronomy and Plant Breeding Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Persian Parviz Ehsanzadeh ehsanp@cc iut ac ir Abstract Using medicinal plants dates back to prehistoric times Oilseed pumpkin is an introduced medicinal plant that seeds and some other organs of which are being hired for treating an array of human diseases in Iran Considering its significance in the health products industry the countrywide drought stress and a lack of information on mineral nutrition of oilseed pumpkin the present study was aimed at studying the impact of irrigation regime and N application on chlorophyll Chl content gas exchange properties proline content yield and yield components of this medicinal plant A 5 replicate split plot randomized complete block experiment was conducted at the Lavark Research Farm College of Agriculture Isfahan University of Technology Isfahan Iran at 2009 Three irrigation regimes based on evaporation from a Class A Standard Evaporation Pan including irrigation after 65 mm I1 control 95 mm I2 moderate water deficit and 130 mm I3 severe water deficit were assigned as main plots Three nitrogen N application rates including zero N N1 control 120 N N2 and 220 N N3 kg ha 1 N as urea chosen as subplots Leaf area index LAI gas exchange attributes Chl and proline content fruits plant seeds fruit 1000 seed weight fruit and seed yields oil content and yield were measured I1 and I3 irrigation levels with 2 11 and 1 46 and N3 and N1 nitrogen levels with 2 50 and 1 16 produced the greatest and smallest LAI respectively Water deficit stress and lowered N application led to significant decreases in leaf Chl content Water deficit led to decreases in the net photosynthetic rate A and leaf stomotal conductance gs but it led to increases in internal Co2 concentration Ci While A and gs increased with N application rate but C i decreased with the increace in N application Proline content increased with both increase in water deficit stress and N application rate I3 irrigation level led to 23 33 5 51 52 and 55 percent decreases in the fruits plant seeds fruit 1000 seed weight seed and fruit yield and oil yield respectively compared to the I1 level N3 level of nitrogen application resulted in 28 22 27 9 and 33 percent decreases in fruits plant fruit and seed yield oil percent and oil yield respectively compared to the N1 level It could be concluded that the negative impact of water deficit stress on yield and its components in oilseed pumpkin is mainly through the decreases in the photosynthetic surfaces and rate and chl content Furthermore application of 220 kg ha 1 N may lead to increases in LAI Chl and A though the latter increases seemingly enhance the growth of vegetative organs rather than reproductive and grain yield components Key words oilseed pumpkin water deficit N photosynthesis proline

پرويز احسان زاده

مصطفي مبلي، مرتضي زاهدي

علي اكبر رامين، حسن كريم مجني