نوع مقاله : مقالات پژوهشی
نویسندگان
دانشگاه فردوسی مشهد
چکیده
به منظور ارزیابی اثر فواصل آبیاری و ترکیبات ضد تعرق بر خصوصیات بیوشیمیایی سیاهدانه، تحقیقی در سال زراعی 1392-1391 در دانشکده کشاورزی دانشگاه فردوسی مشهد آزمایشی بصورت کرتهای خرد شده با طرح پایه بلوکهای کامل تصادفی انجام شد. در کرتهای اصلی فواصل آبیاری (8 و 16 روز) و در کرتهای فرعی ترکیبات ضد تعرق کیتوزان (1، 5/0 ، 25/0 ،0 درصد)، موسیلاژ اسفرزه (5/1، 1 ، 5/0، 0 درصد) و صمغ عربی (75/0، 5/0، 25/0، 0 درصد) با سه تکرار قرار گرفتند. صفات مورد اندازهگیری عبارت بودند از: ترکیبات فنولی، پرولین، کلروفیل، کاروتنوئید، درصد و عملکرد اسانس. نتایج به دست آمده نشان داد اثر آبیاری و مواد ضد تعرق بر صفات مورد اندازهگیری معنیدار بود. میزان ترکیبات فنولی، پرولین، کلروفیل و کارتنوئید در فاصله آبیاری 16 روز افزایش یافت، که این افزایش خود نوعی مکانیسم مقاومت به شرایط خشکی است. ترکیبات ضد تعرق محتوی کلروفیل، کاروتنوئید، ترکیبات فنلی، پرولین را نسبت به شاهد کاهش دادند. افزایش فواصل آبیاری درصد و عملکرد اسانس را کاهش داد. ترکیبات ضد تعرق اثر معنیداری بر میزان مواد موثره گیاه داشت. در بین تیمارهای مورد مطالعه دور آبیاری 8 روز و تیمار کیتوزان 1 درصد بیشترین درصد اسانس (23/0 درصد) و عملکرد اسانس (91/12 کیلوگرم در هکتار) حاصل شد. دور آبیاری 8 روز و ترکیب کیتوزان در غلظت 1 درصد تاثیر معنیداری در کلیه صفات مورد بررسی نسبت به نمونه شاهد داشتند. با توجه به اثر بخشی ترکیبات ضد تعرق این ترکیبات طبیعی میتوانند جایگزین مناسبی برای ترکیبات شیمیایی باشند.
کلیدواژهها
عنوان مقاله [English]
The Effect of Irrigation Intervals and Anti- transpiration Compounds on Phenolic Compounds, Chlorophyll, Carotenoids, Proline, Essential Oil Percentage and Yield in the Nigella sativa
نویسندگان [English]
- Zeinab Safaei
- Majid Azizi
- Hossein Arouiee
- Gholamhossein Davarynejad
Ferdowsi University of Mashhad
چکیده [English]
Introduction: Nowadays Nigella Sativa plant is considered as a 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 water. 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 in the soluble compounds for regulating the osmotic pressure, reduction of nutrient absorption and ultimately reduction of crop production. The use of anti-transpiration 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 anti-transpiration compounds have the potential for transpiration regulation. The aim of the present study is to improve the biochemical characteristics of medicinal plant N. sativa by anti-transpiration compounds under drought stress conditions.
Materials and Methods: The research was done using a split plot experiment based on a randomized complete block design with three replications. The irrigation intervals (8 and 16 days) in main plots and anti-transpiration 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. The distance between the main plots in each block and distance between the two blocks were also assigned as 100 cm and 200 cm, respectively; so that the moisture content of a plot had no effect on the adjacent plots. Anti-transpiration compounds were sprayed simultaneously with applying drought stress till the flowering stage once a week at sunset. Phenolic compounds, proline, chlorophyll, carotenoids, essential oil 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 8-day irrigation interval and chitosan treatment. The results obtained from the study showed that the effect of irrigation intervals and anti-transpiration compounds on the measured traits were significant. The best rate of the measured traits was observed at 8-day irrigation interval and chitosan treatment. The amount of phenolic compounds, proline, chlorophyll and carotenoids increased at 16-day irrigation interval, in which the increase is considered a type of drought tolerance mechanism. Different levels of anti-transpiration compounds decreased the chlorophyll, carotenoids, phenolic compounds, proline, essential oil percentage and yield.
Conclusion: The important processes, including nutrition, photosynthesis, stomatal opening and closure and growth are all influenced by water. Plants are constantly living in tension and develop morphological and physiological changes in the structures and compositions and chemical processes for coping with this tension. In this study, it was observed that the level of phenols, proline, chlorophyll and carotenoids would increase at 16-day irrigation interval, where the increase is considered as a drought tolerance mechanism. The anti-transpiration compounds also led to the significant changes in terms of all the studied traits compared to the control, indicating the effectiveness of theses natural compounds. As the above compounds are natural and biodegradable, as well as safer and less expensive than other chemical anti-transpiration 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.
کلیدواژهها [English]
- Anti-transpiration compounds
- Irrigation intervals
- Nigella Sativa
- Biochemical characterist
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