بررسی اثر تنش خشکی بر برخی خصوصیات مورفولوژیکی و فیزیولوژیکی کنجد (Sesamum indicum L.)
محورهای موضوعی : ژنتیکسحر مومنی 1 , لیلا فهمیده 2 , عباسعلی امام جمعه 3 , مهدی سلوکی 4 , جواد ظهیری 5
1 - گروه اصلاح نباتات و بیوتکنولوژی، دانشکده کشاورزی، دانشگاه زابل، زابل، ایران
2 - گروه اصلاح نباتات و بیوتکنولوژی، دانشکده کشاورزی، دانشگاه زابل، زابل، ایران؛ دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران
3 - گروه اصلاح نباتات و بیوتکنولوژی، دانشکده کشاورزی، دانشگاه زابل، زابل، ایران
4 - گروه اصلاح نباتات و بیوتکنولوژی، دانشکده کشاورزی، دانشگاه زابل، زابل، ایران
5 - گروه بیوفیزیک، دانشکده علوم زیستی، دانشگاه تربیت مدرس، تهران ،ایران
کلید واژه: تنظیم کننده های اسمزی, کنجد, رنگیزه‌های فتوسنتزی, آنزیم‌های آنتی‌اکسیدانی, تنش غیر زیستی,
چکیده مقاله :
تنش خشکی در اکثر مناطق جهان مهم ترین عامل کاهش عملکرد گیاهان زراعی محسوب می شود. به منظور بررسی اثر تنش خشکی بر برخی صفات مورفولوژیک و فیزیولوژیک گیاه کنجد آزمایشی در قالب طرح کاملا تصادفی با سه تکرار اجرا شد. در این آزمایش اثر سطوح مختلف تنش خشکی (سطح آبیاری 5، 10، 15 و 25 درصد ظرفیت زراعی) بر میزان فعالیت آنزیم‌های آنتی‌اکسیدانی شامل: کاتالاز، پلی فنل اکسیداز، آسکوربات پراکسیداز، پراکسیداز، برخی رنگیزه‌های فتوسنتزی (کلروفیل a، کلروفیل b، کلروفیل کل و کاروتنوئیدها)، برخی تعدیل‌کننده‌های اسمزی شامل پرولین و همچنین برخی صفات مورفولوژیکی(تعداد برگ، طول ریشه، ارتفاع ساقه، ارتفاع بوته، طول برگ، عرض برگ، وزن خشک ریشه، وزن تر ریشه، وزن تر اندام هوایی، وزن خشک اندام هوایی، وزن تر بوته، وزن خشک بوته) بررسی شد. پس از کشت گیاه در گلدان، اعمال تنش خشکی (سطح آبیاری 5، 10، 15 و 25 درصد ظرفیت زراعی) در مرحله گیاهچه‌ای (چهار برگی) انجام گردید و سپس صفات مورد مطالعه اندازه‌گیری شد. نتایج تجزیه آماری نشان داد که تنش خشکی اثر معنی داری در سطح یک درصد بر کلیه صفات فیزیولوژیکی و مورفولوژیکی داشت. با افزایش تنش خشکی (تا سطح آبیاری 5 درصد ظرفیت زراعی) کاهش در صفات مورفولوژیکی و رنگیزه های فتوسنتزی نسبت به سطح شاهد بیشتر شد. با افزایش سطوح تنش خشکی افزایش طول ریشه در گیاه کنجد مشاهده شد، به طوری که بیشترین طول ریشه مربوط به سطح آبیاری 5 درصد ظرفیت زراعی و کمترین طول ریشه مربوط به سطح کنترل (سطح آبیاری 25 درصد ظرفیت مزرعه) بود. بیشترین فعالیت آنزیم های آنتی اکسیدانی و پرولین در بیشترین تنش خشکی (سطح آبیاری 5 درصد ظرفیت زراعی) مشاهده گردید. لذا براساس نتایج حاصله پیشنهاد می شود که میزان رشد گیاه در مراحل رشدی و نموی مختلف اندازه گیری و تأثیر تنش در هر دوره مشخص گردد تا تفسیر مناسبی از تأثیر تنش بر روی گیاه بدست آید.
Drought stress is the most important factor in decreasing crop yield in most parts of the world. In order to investigate the effect of drought stress on some morphological and physiological traits of sesame plant, an experiment was conducted in a randomized complete block design with three replications. In this experiment, the effects of different levels of drought stress (5%, 10%, 15%, and 25% field capacity) were investigated on the activity of antioxidant enzymes (catalase, polyphenol oxidase, ascorbate peroxidase, and peroxidase, some photosynthetic pigments (chlorophyll a, chlorophyll b, total chlorophyll, carotenoid), some osmotic regulators including proline, and some morphological parameters (number of leaves, root length, stem height, plant height, leaf length, leaf width, dry weight of root, fresh weight of root, fresh weight of shoots, dry weight of shoots, fresh weight of plant, and dry weight of plant). After planting in pots, drought stress (5%, 10%, 15% and 25% of field capacity) was applied at seedling (four-leaf) stage and then the desired traits were measured. Statistical analyses showed that drought stress had a significant effect on all physiological and morphological features at 1% level. Morphological traits and photosynthetic pigments decreased with increasing drought stress (irrigation up to 5% of field capacity). Increasing drought stress levels increased root length in sesame. The highest root length (3.375 cm) was related to 5% of field capacity irrigation and the lowest root length (2.5 cm) was related to control (25% of field capacity irrigation). The highest levels of antioxidant enzymes and proline were also observed at the highest levels of drought stress (5% of field capacity irrigation). Based on the findings, the plant's growth measurements are recommended to be carried out at various developmental stages to find the effects of stress at each stage so as to get an appropriate understanding of the effects of stress on the plant.
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