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تعیین دماهای کاردینال جوانهزنی علفهرز مهاجم فرفیون خوابیده maculata) (Euphorbia و مدل هیدروتایم جوانهزنی آن | ||
| علوم و فناوری بذر ایران | ||
| مقاله 7، دوره 9، شماره 2 - شماره پیاپی 18، شهریور 1399، صفحه 87-100 اصل مقاله (1.07 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/ijsst.2019.124011.1237 | ||
| نویسندگان | ||
| شایسته صالحی1؛ مرجان دیانت* 2؛ قربان نورمجمدی3 | ||
| 11- دانشجوی کارشناسی ارشد، گروه علوم باغی و زراعی، دانشکده کشاورزی و صنایع غذایی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران | ||
| 2هیات علمی دانشگاه ازاد اسلامی-واحد علوم و تحقیقات تهران | ||
| 33- استاد، گروه علوم باغی و زراعی، دانشکده کشاورزی و صنایع غذایی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران | ||
| چکیده | ||
| به منظور بررسی مولفههای جوانهزنی و تعیین دماهای کاردینال جوانهزنی بذر علفهرز مهاجم فرفیون خوابیده، بذور در دماهای ثابت 2 تا 45 درجه سانتیگراد قرار گرفتند. نتایج نشان داد که که بذر فرفیون خوابیده در دماهای 2، ٥، ١0، و ٤٥ درجه سانتیگراد جوانه نزد و بهترین دما برای جوانهزنی بذر، دمای 30 درجه سانتیگراد (91 درصد) بود. جهت تخمین دماهای کاردینال ٣ مدل دوتکهای، دندان-مانند، چندجملهای درجه٢ مورد استفاده قرار گرفتند. با توجه به ضریب تبیین و جذر میانگین مربعات خطا، بهترین مدل جهت تعیین دماهای کاردینال جوانهزنی بذر فرفیون خوابیده، مدل خطوط متقاطع بود. دماهای کمینه، بهینه و بیشینه برآورد شده توسط این مدل به ترتیب 80/9، 33/28 و 16/43 درجه سانتیگراد بودند. برای بررسی اثر پتانسیل آب بر جوانهزنی در دمای بهینه 28 درجه سانتیگراد بذور در معرض پتانسیلهای اسمزی (0، 2/0-، 4/0-، 6/0- و 8/0-0 مگاپاسکال) قرار گرفتند. بر اساس مدل سیگموئیدی سه پارامتره مقدار برای سرعت جوانهزنی، طول ریشهچه، طول ساقهچه، طول گیاهچه و وزن تر ریشهچه به ترتیب 53/0، 48/0، 51/0، 48/0 و 52/0 مگاپاسکال بود. ثابت هیدروتایم و پتانسیل آب پایه (آستانه پتانسیل آب برای شروع جوانهزنی) بذرفرفیون خوابیده در دمای 28 درجه سانتیگراد به ترتیب 32/291 مگاپاسکال ساعت و 20/1- مگاپاسکال براساس مدل هیدروتایم بر مبنای توزیع نرمال برآورد شد. بدین ترتیب این علف هرز پتانسیل زیادی برای پراکنش به سایر مناطق از جملهها استانهای دارای اقلیم خشکتر نسبت به گلستان را دارا خواهد بود و اقدامات لازم در جهت جلوگیری از پراکنش آن ضروری میباشد. | ||
| کلیدواژهها | ||
| پتانسیل آب؛ دماهای کاردینال؛ سرعت جوانهزنی؛ مدل هیدروتایم | ||
| عنوان مقاله [English] | ||
| Determination of cardinal temperature of Euphorbia maculata and its hydrothermal model of germination | ||
| نویسندگان [English] | ||
| Shayesteh Salehi1؛ Ghorban Noormohammadi3؛ | ||
| 1M.Sc Student, Department of Agriculture and Food Industry, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
| 3Professor, Department of Agriculture and Food Industry, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
| چکیده [English] | ||
| In order to quantify the germination characteristics and determine the cardinal temperature of germination of Euphorbia maculata, seeds were placed at constant temperatures (2- 45 °C). Results showed that seed of E.maculata had no germination at temperatures of 2, 5, 10 and 45 ° C, and the temperature of 30° C was the best temperature for germination seeds (91% Germination percentage). Three models of intersected-line, dent-like segmented and quadratic polynomials were used to estimate the cardinal temperatures. The best model for estimating the cardinal temperatures in E.maculata was intersected-line model with respect to coefficient of determination and mean square error. According to the intersected-line the minimum, optimum and maximum temperatures were calculated 9.8, 28.33 and 43.16 °C. In order to investigate water potential on germination percentage, seeds treated with water potentials (0, -0.2, -0.4, -0.6 and -0.8 MPa) at optimum temperature of 28°C. Baesd on the three-parameter sigmoid method, the value of speed, root length, stem length, seedling fresh weight and dry weight were estimated to be -0.53, -0.48, -0.51, -0.48, -0.52Mpa respectively. According to the hydro-time model based on normal distribution, the hydro-time constant and the base-water potential (which is a threshold for germination beginning) of E.maculata degree were 291.32 (MPa/h) and -1/2 (MPa) at 28 °C, respectively. Thus, this weed species has a great potential for distribution to other areas such as provinces with a dryer climate than Golestan, and the necessary measures to prevent its distribution is necessary. | ||
| کلیدواژهها [English] | ||
| Cardinal temperatures, Germination rate, Hydro-time model, Water potential | ||
| مراجع | ||
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