اثر تنش‌های خشکی، شوری و تیمار اسیدآبسیزیک بر خصوصیات جوانه‌زنی گیاه دارویی شاهدانه (Cannabis sativa L.)
محورهای موضوعی : تکنولوژی بذر
علی صالحی ساردویی
1
(گروه علوم باغبانی، دانشگاه کشاورزی و منابع طبیعی گرگا)
هاجر معتمدی شارک
2
(گروه علوم باغبانی دانشگاه کشاورزی و منابع طبیعی گرگان)
خدایار همتی
3
(گروه علوم باغبانی، دانشگاه کشاورزی و منابع طبیعی گرگان)
کلید واژه: بنیه بذر, ریشه‌چه, ساقه‌چه, اسیدآبسیزیک,
چکیده مقاله :
به‌منظور بررسی اثر اسیدآبسیزیک بر خصوصیات جوانه‌زنی بذر شاهدانه در شرایط یکسان خشکی و شوری، دو آزمایش مستقل همزمان در آزمایشگاه گروه علوم باغبانی دانشگاه علوم کشاورزی و منابع طبیعی گرگان در قالب طرح کاملا تصادفی با چهار سطح اسیدآبسیزیک (0، 5، 10 و 20 میلی‌گرم در لیتر) و پنج سطح تنش (0، 5/1-، 3-، 5/4- و 6- بار) به‌ترتیب برای تنش خشکی و شوری در سه تکرار انجام شد. از محلول‌های PEG و NaCl به‌ترتیب برای ایجاد تنش خشکی و شوری استفاده گردید. نتایج نشان داد که با افزیش تنش خشکی و شوری به‌طور معنی‌داری از درصد جوانه‌زنی، سرعت جوانه‌زنی، شاخص بنیه بذر، طول ریشه‌چه و ساقه‌چه، وزن تر و خشک گیاهچه کاسته شد. اسیدآبسیزیک اثر معنی‌داری بر صفات مورد ارزیابی داشت به‌طوری که در غلظت بالا اثر منفی بر خصوصیات جوانه‌زنی داشت. اثر متقابل اسیدآبسیزیک و تنش خشکی و شوری (به جز وزن تر گیاهچه) اثر معنی‌داری بر تمام صفات مورد ارزیابی در سطح یک درصد نشان داد. به‌طور کلی، نتایج نشان داد که جوانه‌زنی بذرهای شاهدانه تا حدودی شرایط تنش خشکی را بهتر از شرایط شوری تحمل می‌کند. همچنین تیمار اسیدآبسیزیک بسته به سطح تنش و غلظت استفاده شده، اثر متفاوتی داشت به‌طوری که غلظت‌های پایین باعث بهبود خصوصیات جوانه‌زنی شد.
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