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اثر خراشدهی و شوک دمایی بر جوانهزنی بذر و طول دانهرست کنگر وحشی Gundelia tournefortii L. | ||
| علوم و فناوری بذر ایران | ||
| مقاله 6، دوره 13، شماره 4 - شماره پیاپی 36، دی 1403، صفحه 63-96 اصل مقاله (1.66 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijsst.2024.363226.1497 | ||
| نویسندگان | ||
| ابوالفضل خدادادی1؛ ریحانه عموآقایی* 2 | ||
| 1دانش آموخته کارشناسی ارشد، گروه زیست گیاهی، دانشکده علوم، دانشگاه شهرکرد، ایران | ||
| 2استاد، گروه زیست گیاهی، دانشکده علوم، دانشگاه شهرکرد و عضو پژوهشکده بیوتکنولوژی دانشگاه شهرکرد، ایران | ||
| چکیده | ||
| بذرهای کنگر وحشی به دلیل پوشش به شدت لیگنینی شده حاصل از کاپیتول ثانویه، نمیتوانند به آسانی جوانه بزنند. در این مطالعه، سه آزمایش جداگانه، برای بررسی اثر خراشدهی شیمیایی (تیمار با آب، هیپوکلریت سدیم، پراکسید هیدروژن، اسید کلریدریک، اسید سولفوریک و اسید استیک20 درصد به مدت 20، 40 و 60 دقیقه)، خراشدهی مکانیکی (شاهد، 5 و 10 دقیقه سنبادهزنی، تیغ و اسکالپل) و شوکهای دمایی (کاربرد منفرد یا ترکیبی 60 دقیقه فروبردن در آب جوش و 1، 2 و 3 روز فریز کردن بذر) بر جوانهزنی بذرهای توده چلگرد انجام شد. نتایج نشان داد بدون خراشدهی، جوانهزنی بذرها بسیار کم بود امّا همه روشهای خراشدهی مکانیکی، در حد معنیداری جوانهزنی را افزایش دادند. در بین تیمارهای خراشدهی شیمیایی، بیشترین جوانهزنی با تیمار 20 دقیقه فرو بردن در اسید کلریدریک (76/54 درصد) بهدست آمد اما رشد دانهرست مطلوب نبود. تیمار ترکیبی60 دقیقه خیساندن در آب جوش و سپس 3 روز فریز بذر، بهتر از شوک دمایی منفرد بود و شاخصهای جوانهزنی، طول دانهرست و بنیه را افزایش داد. درکل نتایج نشان داد بهترین شیوه برای شکست خواب فیزیکی بذرهای کنگر وحشی، خراشدهی با اسکالپل بود که بیشترین درصد جوانهزنی (46/58)، عدد پیک (5/3)، میانگین جوانهزنی روزانه (2/3 عدد در روز) و ارزش جوانهزنی (53/11) را ایجاد کرد. | ||
| کلیدواژهها | ||
| اسکالپل؛ اسید کلریدریک؛ پراکسید هیدروژن؛ فریز کردن؛ هیپوکلریت سدیم | ||
| عنوان مقاله [English] | ||
| The effect of scarification and temperature shock on seed germination and seedling length of Gundelia tournefortii L. | ||
| نویسندگان [English] | ||
| Abu-Alfazl Khodadadi1؛ Rayhaneh Amooaghaie2 | ||
| 1MSc Graduate, Plant Science Department, Faculty of Science, Shahrekord University, Shahrekord, Iran | ||
| 2Professor, Plant Science Department, Faculty of Science, Shahrekord University, Shahrekord, Iran and Biotechnology Research Institute, Shahrekord University, Shahrekord, Iran. | ||
| چکیده [English] | ||
| Gundelia tournefortii L. seeds owing to the strongly lignified disseminule from secondary capitulum, cannot germinate easily. In current study, three individual experiments were done to investigate the impact of chemical scarification (treatment with water, hydrochloric acid, sulfuric acid, acetic acid, sodium hypochlorite and hydrogen peroxide in durations of 20, 40, 60 min), physical scarification (control, scalpel, blade and 5, 10 min sand paper) and temperature shocks (individual or combined treatment with boiled water for 60 min and 1, 2, 3 days freezing on seed germination of chelgerd population. Results showed that in non-scarified seeds, germination was very low, but all mechanical scarification methods significantly increased seed germination. Among chemical scarification treatments, the highest seed germination obtained by 20 min soaking in hydrochloric acid but seedling growth was not favorable. The combined treatment of 60 min soaking in hot water and 3 days freezing, better than individual temperature shock increased germination indices, seedling length and vigor. In sum, results showed that the best method for physical dormancy breaking of kenger seeds was scarifying with scalpel that imparted the maximum germination percentage (58.46%), peak value (3.5), mean daily germination (3.2 days) and germination value (11.53). | ||
| کلیدواژهها [English] | ||
| Freezing, Hydrochloric acid, Hydrogen peroxide, Scalpel, Sodium hypochlorite | ||
| مراجع | ||
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