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Open Access Article
1 - Evaluating Some Physiological Characteristics of Safflower Cultivars )Carthamus tinctorius L.( Under Water Deficit Stress and Brassionosteroide Application
Mahnaz Zafari Ali Ebadi Sodabeh Jahanbakhsh godehahriz Mohammad SedghiTo evaluate the effects of water deficit stress and growth regulator (Brassinosteroid) on some physiological characteristics cultivars of safflower, an split plot factorial experiment based on randomize complete block design with 3 replications was conducted at the Rese MoreTo evaluate the effects of water deficit stress and growth regulator (Brassinosteroid) on some physiological characteristics cultivars of safflower, an split plot factorial experiment based on randomize complete block design with 3 replications was conducted at the Research Farm of Faculty of Agriculture, Mohaghegh Ardabili University in 2014. Water stress was in three levels: 80 mm evaporation (normal irrigation); 120 mm evaporation (low water stress); 160 mm evaporation (high water stress) from evaporation pan of class A which were assigned to main plots and three cultivars of safflower (Goldasht, Spiny Sina and Faraman) and two levels of Brassinosteroid, control and 10 -7 mol. in sub plots. The reasults showed that water stress decreased stomatal conductance, photosynthetic rate, sub-stomatal CO2, water-use efficiency, chlorophyll content index (SPAD), seed yield, leaf soluble protein and transpiration rate. The results also showed that use of brassinosteriod, increased photosynthetic parameters and reduced transpiration. Irrigation at evaporation of 80 mm from pan, resulted in the maximom amount of transpiration and stomatal conductance to the Faraman cultivar, sub-stomatal CO2 to Sina spiny cultivar and chlorophyll content index (SPAD) to Goldasht cultivar. Irrigation at 120 mm evaporation from class A pan resulted in the maximum amount of transpiration and stomatal conductance to Goldasht cultivar, while the highest sub-stomatal CO2, belonged to Sina spiny. Irrigation at 160 mm evaporation from class A pan resulted in the maximum amount of transpiration, stomatal conductance, chlorophyll content index (SPAD) and the sub-stomatal CO2 to Goldasht cultivar. It seems that Goldasht cultivar under both mild and severe drought stresses tolerates drought better than the other two cultivars in Ardabil rigion. Manuscript profile -
Open Access Article
2 - Effect of adding perlite in soil on some growth and physiology characteristics of Queues castanifolia seedlings under water deficit stress
zohreh zoghi Seyed Mohsen Hosseini Masoud Tabari Kouchaksaraei Yahya KoochDraught stress is the most important abiotic stress significantly affecting plants’ growth, development, and performance. This study was carried out to determine the effect of perlite, as a modifying element of soil, on growth and physiological responses of Queues MoreDraught stress is the most important abiotic stress significantly affecting plants’ growth, development, and performance. This study was carried out to determine the effect of perlite, as a modifying element of soil, on growth and physiological responses of Queues castanifolia seedlings under water deficit stress. A factorial experiment was conducted as randomized complete block design under greenhouse condition of the Agricultural and Natural Resources Research Center in Gorgan, 2015. Perlite treatments at 4 levels (0, 15, , and 35% (V/V)) were added in soil and water stress at 3 levels (40, 70, and 100% irrigation at field capacity) were applied in the pot experiment for 5 months. Some parameters including gas exchange (photosynthesis, stomatal conduction, and transpiration), leaf water potential of seedlings, diameter and height growth, and dry weight of root, stem, leaf, and seedlings were measured in different treatments at the end of the experiment period. Results showed that all parameters were affected by different levels of irrigation and perlite. Water deficit by 40% FC reduced 51% and 68% of photosynthesis and stomatal conductance, respectively. The highest diameter and height growth and dry weight of the seedlings were observed in 25% and 35% (V/V) perlite application under normal and stress conditions, respectively. The use of perlite alleviated the negative effects of water deficit and ameliorated seedling growth. The findings suggest that perlite application in soil is suitable for the production of desirable seedlings under water deficit condition. Manuscript profile -
Open Access Article
3 - بررسی پاسخهای فیزیولوژیکی گل مریم (Polianthes tuberosa L.) در شرایط تنش کم آبیاری
خانی شاکرمی بهمن زاهدی عبدالحسین رضایی نژاد صادق موسوی فردتنش آب یکی از عوامل اصلی محدوده کننده تولید و آسیبهای شدید به گیاهان در ایران است. به­منظور بررسی و مقایسه اثر تنش کم آبیاری بر روی برخی خصوصیات فیزیولوژیکی، بیوشیمیایی و فعالیت آنزیمهای آنتیاکسیدانی گل مریم، آزمایشی با دو رقم گل مریم (پرپر و کم پر) و سه سطح تنش Moreتنش آب یکی از عوامل اصلی محدوده کننده تولید و آسیبهای شدید به گیاهان در ایران است. به­منظور بررسی و مقایسه اثر تنش کم آبیاری بر روی برخی خصوصیات فیزیولوژیکی، بیوشیمیایی و فعالیت آنزیمهای آنتیاکسیدانی گل مریم، آزمایشی با دو رقم گل مریم (پرپر و کم پر) و سه سطح تنش کم آبیاری (بدون تنش W1= 90% FC، تنش متوسط W2=75% FCو تنش شدید W3=60% FC) به­صورت فاکتوریل بر پایه طرح کاملاً تصادفی با سه تکرار انجام شد. محتوای آب نسبی، نشت الکترولیت، کلروفیل کل، کاروتنوئید، پرولین، میزان مالوندیآلدهید، فعالیت آنزیمهای آنتیاکسیدانی (سوپراکسیددیسموتاز، آسکوربات پراکسیداز و کاتالاز)، میزان فتوسنتز، میزان تعرق و مقاومت روزنهای مورد بررسی قرار گرفت. نتایج نشان داد که ویژگیهای فیزیولوژیکی و بیوشیمیایی گل مریم تحت تأثیر تنش کم آبیاری قرار گرفتند. میزان مالوندیآلدهید و نشت یونی همبستگی معنیداری با اکثر خصوصیات فیزیولوژیکی نشان داد. محتوای آب نسبی، کلروفیل کل، میزان فتوسنتز، میزان تعرق، مقاومت روزنهای، فعالیت سوپراکسیددیسموتاز و آسکوربات پراکسیداز در رقم کم پر نسبت به رقم پرپر افزایش معنی­داری نشان داد. همچنین میزان کاتالاز، مالوندیآلدهید و محتوای پرولین در رقم پرپر نسبت به رقم کم پر به­طور معنیداری بیشتر بود. نتایج این تحقیق نشان داد که رقم کم پر نسبت به رقم پرپر در شرایط تنش کم آبیاری، رشد بهتری داشت. Manuscript profile -
Open Access Article
4 - Response of Pistachio (Pistacia vera L.) Seedling Rootstocks to Salicylic Acid Foliar Application under Water Stress
Mostafa Ghasemi Kazem Arzani Abbas Yadollahi Hossein Hokmabadi Majid Agha-Alikhani