تاثیر تنش شوری و خشکی بر خصوصیات تاثیر تنش شوری و خشکی بر خصوصیات جوانه‌زنی و رشدی گیاهچه جو دره (Hordeum spontaneum Koch)
محورهای موضوعی : تنش های محیطیسعیده عالی پور 1 , شکوفه غلامی 2 , طیبه رستمی 3
1 - دانشجو
2 - دانشگاه شاهد تهران
3 - دانشجو
کلید واژه: علف هرز, کلرید سدیم, گیاهچه, پلی اتیلن گلایکول,
چکیده مقاله :
به منظور بررسی جوانه‌زنی بذر جو دره در سطوح مختلف تنش شوری و خشکی دو آزمایش جداگانه در قالب طرح کاملا تصادفی با 5 سطح پتانسیل شوری (صفر (شاهد)،3-، 6-،9 - و12- بار) در 4 تکرار و تنش خشکی شامل 5 سطح پتانسیل خشکی (صفر (شاهد)، 3- ، 6- ، 9- و12- بار) با 4 تکرار در آزمایشگاه تحقیقاتی دانشگاه کشاورزی و منابع طبیعی رامین اهواز در سال 95 انجام شد. از پلی اتیلن گلایکول 6000 و کلرید سدیم به ترتیب برای ایجاد تنش خشکی و شوری استفاده شد. نتایج نشان داد که با افزایش تنش شوری و خشکی به صورت معنی‌داری درصد جوانه‌زنی، سرعت جوانه‌زنی، شاخص بنیه بذر، طول ساقه‌چه و ریشه‌چه، وزن تر ریشه‌چه و ساقه‌چه کاسته شد و زمان 50 درصد جوانه‌زنی نهایی افزایش یافت. به نظر می‌رسد وزن تر و خشک گیاهچه در بین سایر صفات حساسیت بیشتری به تنش شوری و خشکی دارد. علاوه بر این مقایسه گروهی بین تیمارها ناشی از PEG و NaCl نشان داد به دلیل حساسیت بالاتر جودره نسبت به تنش خشکی طول ساقه‌چه، وزن تر گیاهچه و بنیه گیاهچه در شرایط ناشی از PEG به طور معنی‌داری کمتر از تنش ناشی از NaCl بود.
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