4125

202 دكتري

دكتري

خاكشناسي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1387

دوازده،171،[II] ص: مصور، جدول، نمودار

ص.ع. به: فارسي و انگليسي

حسين شريعتمداري، محمد علي حاج عباسي

خورشيد رزمجو، فريبرز معطر، امير حسين خوشگفتار منش

8/7/87

عليرضا حسين پور، نصرالله قاسمي، مهدي بصيري، محمود كلباسي

مهندسي كشاورزي

ID202 دكتري

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

AbstractMatricaria is an important medicinal species that is widely planted in salt affected soils The influence of salinity and drought tolerance on Matricaria has not been welldocumented in the literature This investigation was undertaken to study the effects ofNaCl and drought on germination and physiological biochemical and growth responsesof two chamomile species Seeds were germinated at five osmotic potential levels 0 0 175 0 358 0 541 and 0 716 MPa NaCl equal to control 5 10 15 and 20 dS m for salinity and 0 0 05 0 1 0 2 and 0 3 MPa polyethylene glycol PEG6000 fordrought Then the growth of chamomile was studied at five salinity levels 0 5 10 15and 20 dS m by NaCl in hydroponic solution media In order to examine droughtstress gravitational method and four treatments FC soil moisture content and 75 90and 95 depletion percent of soil AWC in a pot experiment were used Shoot and rootdry weight shoot height root depth macro and micro element concentrations NO3 RWC proline flavonol O glycosides chlorophyll a and b was determined Seeds werenot germinate at 0 8 MPa NaCl and 0 4 MPa of PEG Germination reduction insolution of PEG was more significant than in NaCl M aurea and M chamomilla werenot grown at 20 and 25 dS m NaCl respectively Plant growth significantly increasedwith increasing NaCl concentration up to 40 mM while decreased at higher salinitylevels The concentration of chloride and sodium ions was increased significantly invarious parts of the plant with salinity There were a decrease in K Na and Ca Na ratiosin shoots and roots Plants maintained considerably higher K Na ratio in the shoots thanthose in the roots Chamomile species are tolerant to moderately salt tolerant cropduring growth This might be associated with maintenance of high K Na and Ca Naratios in shoots accumulation of Na in roots and proline accumulation in shoots Thisstudy showed that M chamomilla is more salt tolerant than M aurea The M aureaspecies was more drought tolerant than M chamomilla Mineral nutrient concentrationsdecreased with drought severity The Results showed that both salinity and droughtreduced flower dry weight and flavonoids concentration but the effect of drought wasmore pronounced than salinity Flowers dry weight significantly increased withincreasing NaCl concentration up to 40 mM while decreased at higher salinity levels There were no significant differences between salinity treatments up to 80 mM NaCl forflavonol O glycosides concentration Regarding the dry flower yield the highestcontent of flavonol O glycosides was observed in 40 mM NaCl treatments Flower dryweight and flavonol O glycosides decreased as drought levels increased

حسين شريعتمداري، محمد علي حاج عباسي

خورشيد رزمجو، فريبرز معطر، امير حسين خوشگفتار منش

عليرضا حسين پور، نصرالله قاسمي، مهدي بصيري، محمود كلباسي