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کمیسازی پاسخ جوانهزنی بذرهای پیر شده شکر تیغال (Echinops spp) به تنش اسمزی با استفاده از مدلهای غیرخطی و هیدروتایم | ||
| علوم و فناوری بذر ایران | ||
| دوره 11، شماره 1 - شماره پیاپی 25، خرداد 1401، صفحه 101-116 اصل مقاله (963.47 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijsst.2021.354650.1396 | ||
| نویسندگان | ||
| طیبه السادات چراغی تخت چوبی1؛ سید امیر موسوی* 2؛ احمد زارع3؛ احمد کوچک زاده4؛ قاسم پرمون5 | ||
| 1گروه مهندسی تولید و ژنتیک گیاهی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان | ||
| 2عضو هیأت علمی گروه مهندسی تولید و ژنتیک گیاهی، دانشکده کشاورزی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان. | ||
| 3استادیار گروه مهندسی تولید و ژنتیک گیاهی. دانشگاه علوم کشاورزی و منابع طبیعی خوزستان | ||
| 4گروه مهندسی تولید و ژنتیک گیاهی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان | ||
| 5دانشگاه محقق اردبیلی | ||
| چکیده | ||
| اثر پیری تسریع شده بر روی جوانهزنی بذر شکر تیغال با استفاده از مدلهای غیر خطی سیگموئید، دندانهای، گامپرتز و ریچارد و همینطور هیدروتایم در توزیعهای ویبول، نرمال و گامبل کمیسازی شد. آزمایش به صورت فاکتوریل در قالب طرح کامل تصادفی با سه تکرار انجام شد. عاملهای آزمایشی شامل پیری بذر برای مدت (0، 24، 48، 72 و 96 ساعت) در رطوبت نسبی 100RH=، دمای (T) 40 درجه سلسیوس و هفت پتانسیل اسمزی (صفر، 2/0-، 4/0-، 6/0-، 8/0-، 1-، 2/1- MPa) بود. نتایج آزمایش نشان داد که اثر متقابل میان پیری و تنش اسمزی روی درصد و سرعت جوانه زنی شکر تیغال معنیدار بود. صفات جوانهزنی بذر شکر تیغال با افزایش زمان پیری تار 72 ساعت افزایش یافت اما در تیمار 96 ساعت کاهش پیدا نمود. گامپرتز بهترین برازش را برای تیمار پیر نشده، 24 و 48 ساعت پیر شده ایجاد نمود و مدل سیگموئید برای 72 و 96 ساعت پیری بهترین برازش را نشان داد. در بین تمامی توزیعهای مورد بررسی، توضیع نرمال مناسب ترین بود و بنابراین پتانسیل پایه (ψb) و ثابت هیدروتایم (θH) بر اساس آن به ترتیب MPa 68/0- و MPa h 6 براورد شدند. اگرچه پس از 96 ساعت تیمار پیری، ψb و θH یه ترتیب MPa 731/0- و MPa h 3/19 برآورد شدند. میتوان نتیجه گرفت که بذرهای برداشت تازه شکرتیغال دارای درجاتی از خواب بذر هستند که در شرایط تیمار پیری خفیف تا متوسط برطرف شده اما پس از 72 ساعت، مکانیسمهای پیر باعث ایجاد آسیب شده و کیفیت جوانهزنی کاهش مییابد. | ||
| کلیدواژهها | ||
| تنش اسمزی؛ زوال؛ گامبل | ||
| عنوان مقاله [English] | ||
| Quantification of seed germination response of Echinops aged seeds under osmotic stress using various nonlinear models and hydrotime function | ||
| نویسندگان [English] | ||
| Tayebeh Alsadat Cheraghi Takht Choobi1؛ Seyed Amir Moosavi2؛ ahmad zare3؛ Ahmad KoochekZade4؛ ghasem parmoon5 | ||
| 1Department of Plant Production and Genetics, Faculty of Agriculture, Agricultural Sciences and Natural Resources University of Khuzestan. | ||
| 2Department of Plant production of Genetics, Khuzestan University of Agricultural Sciences and Natural Resources. | ||
| 3Assistant Professor of Plant Production and Genetics Department, Faculty of Agriculture, Agricultural Sciences and Natural Resources University of Khuzestan. Bavi, Mollasani, Iran | ||
| 4Department of Plant Production and Genetics, Faculty of Agriculture, Agricultural Sciences and Natural Resources University of Khuzestan. | ||
| 5University of Mohaghegh Ardabili | ||
| چکیده [English] | ||
| The effects of accelerated aging treatment on seed germination of Echinops was quantified using nonlinear models using Sigmoid, Segmented, Gompertz and Richards models and hydrotime model in Weibull, Normal and Gombel distribution functions. Experimental factors were seed aging for (0, 24, 48, 72 and 96 hour) at relative humidity (RH)=100%, temperature (T) =40 oC and seven osmotic potential (0, -0.2, -0.4, -0.6, -0.8, -1, -1.2 MPa). Results of experiment revealed that interaction effect of aging and osmotic stress on seed germination and germination rate of Echinopsis was significant. Seed germination parameters of Echinops were increase by aging treatment up to 72 h but it was declined at aging treatment of 96 h. Seed germination and germination rate were increased by aging treatment till 72 h but at 96 h, both were declined. Gompertz exhibited the best fit for no aged, 24 h and 48 h while sigmoid function was provided the best fit for aging at 72 and 96 h. Among all studied distribution function, it was revealed that normal distribution was the most effective one thus base potential (ψb) and hydrotime constant (θH) were -0.68 MPa and 6 MPa hour, respectively. However, after 96 h of aging treatment ψb and θH were estimated 0.731 MPa and 19.3 MPa hour, respectively. It can be concluded that freshly harvested Echinops exhibited some levels of seed dormancy which was alleviated at mild to moderate aging conditions, but after 72 h, deteriorative mechanism led to damaging effects and declined seed germination quality. | ||
| کلیدواژهها [English] | ||
| Osmotic stress, deterioration, Gumbel | ||
| مراجع | ||
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