5117

4807

كارشناسي ارشد

زراعت

اصفهان: دانشگاه صنعتي اصفهان،دانشكده كشاورزي

1388

نه،84ص.:مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

پرويز احسان زاده

احمد ارزاني،خورشيدرزمجو

89/1/28

مجيد طالبي،مينا رستم زا

1396/09/28

كتابنامه

مهندسي كشاورزي

ID4807

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

AbstractShortage of water resources imposes serious decreases in crop productivity annually inIran Therefore this research was aimed at studying the effect of irrigation regimes onantioxidant enzymes Membrane Stability Index MSI Relative Water Content RWC in leaves yield and yield components of safflower genotypes A 3 replicate split plotRCBD field experiment was conducted at the Lavark Research Farm College ofAgriculture Isfahan University of Technology Isfahan Iran in 2009 Three levels ofirrigation based on evaporation from a standard Class A Pan consisting I1 ascontrol irrigation after 75 mm I2 as moderate drought irrigation after 115 mmevaporation and I3 as severe drought irrigation after 155 mm evaporation served as mainplots Six safflower genotypes consisting Arak 2811 Kooseh Nebraska 10 C111 S149 andK12 were considered as sub plots Leaf Area Index LAI antioxidant enzymes MSI andRWC at flowering stage and yield attributes at two weeks after physiological maturitywere measured Catalase CAT and Ascorbate Peroxidase APX activities increasedunder I2 irrigation level by 19 and 8 5 and decreased under I3 level by 33 8 and 45 compared to I1 respectively Severe drought led to significant decreases in LAI 64 9 MSI 33 8 and RWC 34 9 While under I3 level of irrigation decreases inhead plant 27 seed head 15 6 grain yield 35 6 biological yield 33 9 andoil percntage 11 4 were observed an increase in protein percntage 17 wasdetected compared to I1 While severe drought inhanced the level of antioxidant enzymesin more resistant genotypes it decreased these enzymes in more sucesptible genotypes The greatest decreases in MSI LAI and RWC along with the decreases in CAT and APXactivities under water deficit was observed with S149 Kooseh Nebraska and Arak leading to a lower resistance to water deficit stress with the latter genotypes In K12 andC111 genotypes increases in CAT and APX along with maintenance of MSI and RWC ledto more resistance to the drought stress Therefore it can be concluded that activation ofantioxidant defence in safflower has a key role in resistance to the stress but significantinteraction between genotypes and irrigation levels for antioxidant enzymes LAI MSIand RWC indicates the quantity of these antioxidant enzymes is not a sole determinant ofresistance to water deficit stress at least with genotypes used in our study Instead plantcapabilities in maintaining its RWC MSI and LAI under water deficit stress could alsocontribute to the level of tolerance to this environmental constraint key Words safflower drought catalase ascorbate peroxidase membrane stability index relative water content yield

پرويز احسان زاده

احمد ارزاني،خورشيدرزمجو

مجيد طالبي،مينا رستم زا