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بهبود پاسخ دما-رطوبتی بذر ذرت تحت تنش خشکی با استفاده از آبسیزیک اسید، جیبرلیک اسید و سالیسیلیک اسید | ||
| علوم و فناوری بذر ایران | ||
| مقاله 4، دوره 11، شماره 3 - شماره پیاپی 27، آذر 1401، صفحه 55-71 اصل مقاله (1.08 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijsst.2019.125557.1264 | ||
| نویسندگان | ||
| الهام بحرآبادی1؛ رضا توکل افشاری* 2؛ مهدی نصیری محلاتی3 | ||
| 1گروه اگروتکنولوژی دانشگاه فردوسی مشهد | ||
| 2استاد | ||
| 3استاد گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه فردوسی مشهد | ||
| چکیده | ||
| به منظور ارزیابی تاثیر دما، خشکی و پرایمینگ بر شاخص‌های درصد و سرعت جوانه‌زنی بذر ذرت، آزمایشی به صورت فاکتوریل بر پایه طرح آماری کاملاً تصادفی با چهار تکرار انجام شد. تیمارها شامل سطوح دمایی (5، 10، 15، 20، 25، 30، 35 و 45 درجه سلسیوس)، پتانسیل خشکی (0/0، 4/0-، 8/0- و 2/1- مگاپاسکال) و اعمال پرایمینگ (شاهد، هیدروپرایمینگ، آبسیزیک اسید، جیبرلیک اسید و سالیسیلیک اسید) بودند. بنا بر نتایج این پژوهش، افزایش دما و خشکی سبب کاهش پارامترهای درصد و سرعت جوانه‌زنی شد؛ به طوری که در پتانسیل‌های کمتر از 8/0- مگاپاسکال در تمامی سطوح دما و خشکی، کاهش معناداری در شاخص های ذکر شده مشاهده گردید. در دمای 35 درجه سلسیوس، درصد جوانه‌زنی در شرایط بدون اعمال پرایمینگ از 94 به 36 درصد (خشکی2/1- مگاپاسکال) کاهش یافت. تحت این شرایط، تیمار جیبرلیک اسید سبب بهبود جوانه‌زنی شد. برای تعیین دماهای کاردینال ذرت از مدل‌های رگرسیونی (دندان- مانند، دوتکه‌ای و بتا) استفاده شد. طبق نتایج آزمایش، مدل دندان- مانند، به عنوان بهترین مدل ارزیابی شد و بر اساس آن، دمای پایه، مطلوب 1، مطلوب2 و حداکثر به ترتیب 51/9، 12/24، 35 و 6/44 درجه سلسیوس برآورد گردید. به منظور بررسی تاثیر دما و پتانسیل آب بر جوانه‌زنی بذر تحت شرایط خشکی از مدل رگرسیونی غیر خطی هیدروترمال تایم استفاده شد. با توجه به آن که افزایش مقدار انحراف معیار از دمای پایه نشان دهنده توانایی جوانه‌زنی بذر در پتانسیل‌های متفاوت اسمزی است، هیدروپرایمینگ، جیبرلیک اسید و سالیسیلیک اسید سبب افزایش این مقدار نسبت به تیمار بدون پرایمینگ شدند. | ||
| کلیدواژه‌ها | ||
| پرایمینگ؛ تنش خشکی؛ جوانه‌زنی؛ دماهای کاردینال؛ مدل هیدروترمال تایم | ||
| عنوان مقاله [English] | ||
| Improvement of hydrothermal response of corn seed under drought stress using abscisic acid, gibberellic acid, and salysilic acid | ||
| نویسندگان [English] | ||
| Elham Bahrabadi1؛ R. Tavakkol Afshari2؛ Mehdi Nassiri Mahallati3 | ||
| 1College of Agrotechnology ,Ferdowsi University of Mashhad | ||
| 2Ferdowsi Univ. Mashhad | ||
| 3Department of Agronomy, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad. | ||
| چکیده [English] | ||
| In order to evaluate the effect of temperature, drought and priming on the percentage and rate germination of corn seeds, a factorial experiment based on a completely randomized design with four replicates was conducted. Treatments included eight temperature (5, 10, 15, 20, 25, 30, 35, 40 and 45 ºC), four drought potential (0, -0.4, -0.8 and -1.2 MPa), and five priming (control, hydroprimin, GA priming, ABA priming and, SA ptiming). Both percentage and rate of germination were inhibited at osmotic potentials ≤−0.8 MPa PEG. At 35 ºC temperature. Germination percentage of unprimed seeds was reduced from 94 to 36% in −1.2 MPa. Under these conditions, gibberellic acid hormone treatment improved seed germination. The effect of temperature on germination can be defined in terms of cardinal temperatures. We compared three non-linear regression models (Dent-like, segmented and beta). The outcome revealed that the Dent-like function was suitable for use in describing seed germination response to temperature. The base, optimum 1, optimum 2 and ceiling temperature were estimated to be 9.51, 24.12, 35 and 44.62 °C, respectively. The response of germination rate to both temperature and water potential can be described as a non-linear function of the hydrothermal model. According to the results of this study, hydropriming, gibberellic acid, and salicylic acid increased the mean deviation of the base temperature compared to non-priming treatment, increasing the standard deviation of the base temperature indicates the ability of seed germination in different osmotic potentials. | ||
| کلیدواژه‌ها [English] | ||
| Priming, drought stress, Germination, Cardinal temperatures, Hydrotermal time models | ||
| مراجع | ||
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