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بررسی اثر تیمارهای مختلف در شکستن خواب و تحریک جوانهزنی بذر (Firmiana simplex) | ||
| علوم و فناوری بذر ایران | ||
| مقاله 13، دوره 7، شماره 1 - شماره پیاپی 13، مرداد 1397، صفحه 167-179 اصل مقاله (1.14 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/ijsst.2018.108272.1022 | ||
| نویسندگان | ||
| سیما بادلی* ؛ حسین زارعی | ||
| دانشگاه علوم کشاورزی و منابع طبیعی گرگان | ||
| چکیده | ||
| با توجه به اینکه جوانهزنی بذر درخت سیدالاشجار (Firmiana simplex L.) مشکل بوده و تکثیر بذری این گیاه را با مشکلاتی روبرو کرده است، لذا در این پژوهش به بررسی عوامل بازدارنده جوانه زنی بذر و چگونگی رفع آنها پرداخته شده است. این آزمایشها در قالب طرح کاملاً تصادفی و به صورت فاکتوریل با سه تکرار در آزمایشگاه علوم باغبانی دانشگاه علوم کشاورزی و منابع طبیعی گرگان در سال 1393 اجرا شد. برای رفع خواب فیزیکی (پوسته سخت) از تیمارهای مکانیکی خراشدهی با ماسه ریز به مدت صفر، 5، 10 و 15 دقیقه، آب گرم (70 درجه سانتیگراد) و اسید (قرار دادنبذور در محلول اسید سولفوریک غلیظ به مدت 1، 5 و 10 دقیقه و سپس شستشو با آب به مدت 20 دقیقه) و برای رفع خواب فیزیولوژیک، سرمادهی بهمدت 30، 45 و 60 روز در دمای3 تا 6 درجه سانتیگراد اعمال گردید. نتایج نشان داد که بالاترین درصد جوانهزنی مربوط به خراشدهی با ماسه (78 درصد) به مدت 15 دقیقه و 30 روز چینه سرمایی بود. در بین همه تیمارها کمترین میزان جوانه زنی مربوط به تیمار شاهد (4.6 درصد) بود. از تیمارهای گوناگونی که به منظور شکستن خفتگی موجود در بذر درخت سیدالاشجار از آنها استفاده شد، چنین نتیجه گیری شد که بذرهای دارای خفتگی دوگانه پوسته بذر و خفتگی رویانی میباشد. همچنین نتایج نشان داد استقرار گیاهچه های حاصل از این تیمار خراش دهی (86.6) در مقایسه با سایر تیمارها به خصوص شاهد (بدون خراشدهی) بیشتر بوده است. | ||
| کلیدواژهها | ||
| چینه سرمایی؛ خراشدهی؛ خواب فیزیولوژیک؛ درصد جوانهزنی؛ سید الاشجار | ||
| عنوان مقاله [English] | ||
| The effect of different treatments on breaking dormancy and stimulate germination of Firmiana simplex | ||
| چکیده [English] | ||
| Given that the seed germination of Chinese parasol tree (Firmiana simplex L.) and hence its propagation is experiencing difficulties, therefore, this study investigates the factors limiting seed germination of mentioned tree and how to troubleshoot them are discussed. This experiment was conducted in 2014 in a completely randomized design with a factorial arrangement with three replications in the laboratory of Horticultural Science Department, Gorgan University of Agricultural Sciences and Natural Resources of Iran. In order to remove physical dormancy (impermeable seed coat) mechanical scarification treatments with fine sand (shaking seeds and building sand for 5, 10 and 15 minutes), hot water (70 °C) and acid (treatments of seeds with solution of concentrated sulfuric acid for 1, 5 and 10 minutes and then rinse by tap water for 20 minutes) were used. Moreover to remove the physiological dormancy, stratification of seeds were applied for 30, 45 and 60 days in 3-6oC. The results showed that the highest percentage of seed germination was related to scarification by sand (78%) for 15 minutes and stratification for 30 days. The lowest seed germination rate among all treatments was related to control (4.6%). In overall, it can be concluded from various treatments which used to break dormancy in seeds of Firmiana simplex, it is clear that the seeds of mentioned tree include dual seed dormancy, including seed coat and embryo dormancy. The results also showed seedling establishment of 86.6 % related to combination of scarification and stratification in the mentioned treatment has been much higher than other treatments, specially control (without scarification). | ||
| کلیدواژهها [English] | ||
| Stratification, Scarification, Physiological dormancy, Seed germination, Chinese parasol | ||
| مراجع | ||
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