7061

6603

كارشناسي ارشد

علوم باغباني

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1390

سيزده، 164ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

علي اكبر رامين، فريبا اميني

داوود بخشي

19/7/91

مصطفي مبلي، محمدرضا سبز عليان

1396/09/19

كتابنامه

كشاورزي

مهندسي كشاورزي

ID6603

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Effect of Water Deficit Stress on Growth and Development and Active Constituents of Silybum marianum Fatemeh Alam f alam 2204@yahoo com Date of submission 2012 02 08 Department of Horticultural Science Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language PersianSupervisor Prof Ali A Ramin aa ramin @cc iut ac ir Assistant prof F Amini@araku ac ir Abstract Water stress is one of the most important factors that restricts wordwide productivity of crop plants Two experiments at pot and field conditions were carried out in the College of Agriculture IsfahanUniversity of Technology In the first experiments a completely randomized design CRD wasconducted with four levels of water stress inducing soil water potential of 0 33 4 8 and 12 bar Eachtreatment was replicated four times and each replication was provided with four pots using two plants ineach pot In the second experiment five treatments inducing soil water potential of 0 33 4 8 12 and 15 bar were applied treatment were applied using a randomized complete block design with fourreplications Results indicated that water stress reduced plant length number of leaf per plant shoot freshweight shoot dry weight number of capitule per plant axillary capitule diameter seed yield in terminaland axillary capitule and one thousand seed weight in both experiments Drought caused a significantreduction in root fresh and dry weight root length and diameter in pot experiment The results indicatedthat main capitulue diameter was the only morphological trait which was not significantly influenced bywater stress levels in pot and field experiments The highest content of Silibin a b and total amount weremeasured with 4 and 12 bar in pot and field experiments respectively The highest content of Silymarinwas accumulated under water potential of 4 bar in both experiments The results demonstrated nosignificant different among the treatment in terms of antioxidant activity However The highestantioxidant activities was observed in 12 bar treatment in the field conditions The highest oil percentagewas obtained with 4 bar in both experiments However increase in drought level and time causeddecrease in leaf chlorophyll content and leaf chlorophyll florescence Fv Fm The highest leafchlorophyll content and leaf chlorophyll florescence Fv Fm was obtained in control treatment and 2weeks after water stress and control in 6 weeks after water stress in pot expriment respectively Thehighest leaf chlorophyll content was observed in 8 bar 2 weeks after waters stress treatment whichexhibited no significant difference with control treatment at 2 4 and 6 weeks after water stress treatmentin the field experiment and the highest ratio of leaf chlorophyll florescence Fv Fm was observed 2weeks after water stress In both experiment the lowest leaf chlorophyll content and leaf chlorophyllflorescence Fv Fm was obtained in 12 bar 6 and 8 weeks after stress treatment The results of thisexperiment showed that secondry metabolites were increased under water deficit Also according to theresults of this study it can be expressed that Milk Thistle plants under field conditions were moreresistance to water stress than pot conditions Keywords Milk Thistle Silymarin Silibin Antioxidant Activities and Water Stress

علي اكبر رامين، فريبا اميني

داوود بخشي

مصطفي مبلي، محمدرضا سبز عليان