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   اثر فواصل آبیاری و ترکیبات طبیعی ضد تعرق بر صفات مورفولوژیکی، فیزیولوژیکی و شاخص بهره‌وری آب آبیاری سیاهدانه (L. Nigella Sativa)  
   
نویسنده صفایی زینب ,عزیزی مجید ,آرویی حسین ,داوری نژاد غلامحسین
منبع علوم باغباني - 1397 - دوره : 32 - شماره : 3 - صفحه:371 -382
چکیده    به منظور ارزیابی اثر فواصل آبیاری و ترکیبات ضد تعرق بر صفات مورفولوژیکی، فیزیولوژیکی و شاخص بهره‌وری آب آبیاری سیاهدانه، تحقیقی در سال 1392-1391 در دانشکده کشاورزی دانشگاه فردوسی مشهد در قالب آزمایش کرت ‍‌های خرد شده با طرح پایه بلوک‌ های کامل تصادفی انجام شد. در کرت‌ های اصلی فواصل آبیاری (8 و 16 روز) و در کرت ‌های فرعی محلول پاشی ترکیبات کیتوزان (1، 0.5 ، 0.25 و صفر درصد)، موسیلاژ اسفرزه (1.5، 1، 0.5 و صفر درصد) و صمغ عربی (0.75، 0.5، 0.25‌و صفر درصد) با سه تکرار قرار گرفتند. ارتفاع بوته، شاخص سطح برگ، تعداد شاخه فرعی، دمای سطح برگ، میزان هدایت روزنه ای و شاخص بهره‌وری آب آبیاری اندازه‌گیری شدند. نتایج به دست آمده نشان داد که بین تیمارها از نظر تمامی صفات مورد بررسی اختلاف معنی داری وجود داشت. بهترین میزان صفات مورد اندازه‌گیری در دور آبیاری 8 روز و تیمار کیتوزان مشاهده شد. محلول‌پاشی کیتوزان با ایجاد شرایط مناسب نظیر کاهش دمای برگ، میزان هدایت روزنه ای و افزایش شاخص بهره وری آب ابیاری موجب بهبود صفات مورفولوژیکی نسبت به شرایط تنش در فواصل آبیاری 16 روز شد. محلول پاشی با تیمار صمغ عربی نه تنها موجب بهبود صفات مورفولوژیکی، فیزیولوژیکی و شاخص بهره‌وری آب ابیاری نشد، بلکه به عنوان یک عامل بازدارنده تعیین شد. کلیه ترکیبات طبیعی ضد تعرق میزان هدایت روزنه‌ای و دمای سطح برگ را نسبت به شاهد به طور معنی‌داری کاهش دادند. به نظر می رسد استفاده از ترکیب طبیعی کیتوزان می تواند در شرایط تنش رطوبتی به عنوان یک ماده ضد تعرق در شرایط آب و هوایی مشهد مورد استفاده قرار گیرد.
کلیدواژه ترکیبات ضد تعرق، تنش خشکی، دمای گیاه، گیاه دارویی، میزان هدایت روزنه ای
آدرس دانشگاه فردوسی مشهد, دانشکده کشاورزی, گروه علوم باغبانی, ایران, دانشگاه فردوسی مشهد, دانشکده کشاورزی, گروه علوم باغبانی, ایران, دانشگاه فردوسی مشهد, دانشکده کشاورزی, گروه علوم باغبانی, ایران, دانشگاه فردوسی مشهد, دانشکده کشاورزی, گروه علوم باغبانی, ایران
 
   The Effect of Irrigation Intervals and Anti transpiration Compounds on Morphological Traits, Physiological Traits, and Irrigation Water Efficiency Index in the Nigella sativa L.  
   
Authors davarynej Gholamhossein ,aroiee Hossein ,azizi majid ,safaei zainab
Abstract    Introduction: Nigella sativa L. is one of the herbs that has a variety of uses and has been used in Iran’s traditional medicine since old times. Today this plant is considered as one of the most important kinds of medicine. Almost all the metabolic activities of plant cells, including the construction of active ingredients in medicinal plants, depend on lack of absorbable water by plants can lead to the morphological, physiological and biochemical changes, including decrease of cell swelling and growth and thus reduction of leaf area and plant height, stomatal closure and photosynthesis restriction, increase of soluble compounds for regulating the osmotic pressure, reduction of nutrient absorption and ultimately reduction of crop production. The use of antitranspiration compounds is considered as a promising tool for the regulation of transpiration in respect of water conservation at an optimal level, where the strategies such as the use of antitranspiration compounds have the potential for transpiration regulation. The aim of the present study is to improve the yield and yield components of medicinal plant N. sativa by antitranspiration compounds under drought stress conditions. Materials and Methods: The research was done using a split plot experiment on a randomized complete block design with three replications. The irrigation intervals (8 and 16 days) in main plots and antitranspiration compounds of chitosan (0.25, 0.5 and 1 %), Plantago psyllium mucilage (0.5, 1 and 1.5 %) and arabic gum (0.25, 0.5 and 0.75 %) were put in subplots with three replications. Also, the distance between the main plots in each block and distance between the two blocks were assigned as 100 cm and 200 cm, respectively; so that the moisture content of a plot had no effect on the adjacent plots. Planting date was April 16 and planting was performed by hand in 0.5cmdeep furrows. Antitranspiration compounds were sprayed simultaneously with applying drought stress till the flowering stage once a week at sunset. Plant height, leaf area index, irrigation water efficiency index, leaf temperature and stomatal conductance were measured. Results and Discussion: The results showed that there were significant differences between treatments in all studied traits. The best rate of the measured traits was observed at 8day irrigation interval and chitosan treatment. Providing plant favorite conditions such as reducing plant temperature, increasing morphological traits comparing to rainfed at 16day irrigation interval. Applying arabic gum did not improve growth but acted as a growth inhibitor. Antitranspiration compounds led to significant changes in all the studied traits compared to the control, indicating the effectiveness of these natural compounds. Chitosan stimulating abscisic acid synthesis in the treated plant would result in stomatal closure, reduction of stomatal conductance, transpiration rate and water content. It also pointed out that the antitranspiration effect of chitosan was because of its stimulatory effect in increasing abscisic acid concentration in the treated leaves of bean plant. As the above compounds are natural and biodegradable, as well as safer and less expensive than other chemical antitranspiration compounds, they can serve as a good alternative to the chemical compounds. Cognition and expertise in water relations of plant and drought stress tolerance is considered as the main program in agriculture and the ability to withstand this stress is of great economic importance. Conclusion: The important processes, including nutrition, photosynthes is, stomatal opening and closure and growth are all influenced by water. In this study, it was observed canopy temperature and stomatal conductance would increase at 16day irrigation interval, where the increase is considered as a drought tolerance mechanism. Also, the antitranspiration compounds led to significant changes in terms of all the studied traits compared to the control, indicating the effectiveness of theses natural compounds. Providing the appropriate conditions, 1% chitosan treatment can enhance the yield under drought stress. Spraying by arabic gum did not improve the growth conditions. According to this experiment, 1% chitosan treatment and 1.5% Plantago psyllium mucilage is considered the most appropriate strategy to enhance the yield of Nigella sativa under drought stress.
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