اثر پیش‌تیمار اسید‌هیومیک بر جوانه‌زنی گیاه دارویی و اقتصادی سرخارگل (.Echinacea purpurea L) در شرایط یکسان تنش‌های خشکی و شوری

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی‌ارشد گیاهان دارویی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

2 استادیارگروه علوم باغبانی، دانشکده تولید گیاهی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

چکیده

به‌‌منظور بررسی اثر پیش‌تیمار اسیدهیومیک بر خصوصیات جوانه‌زنی بذر سرخارگل در شرایط یکسان خشکی و شوری، دو آزمایش مستقل همزمان در آزمایشگاه فیزیولوژی گروه علوم باغبانی دانشگاه علوم کشاورزی و منابع طبیعی گرگان در قالب طرح کاملاً تصادفی با چهارسطح اسیدهیومیک (0، 20، 40 و 60 میلی‌گرم بر لیتر) و پنج سطح تنش (0، 1- ، 2- ، 3- و 4- بار) به‌ترتیب برای تنش شوری و خشکی در سه تکرار انجام شد. از محلول‌های NaCl و  PEGبه‌ترتیب برای ایجاد تنش شوری و خشکی استفاده گردید. نتایج نشان داد که با افزایش تنش شوری و خشکی به‌طور معنی‌دار از درصد جوانه‌زنی، سرعت جوانه‌زنی، طول ریشه‌چه، ساقه‌چه و وزن تر ریشه‌چه و ساقه‌چه و بنیه بذر کاسته شد و در سطح 4- بار شوری و خشکی به صفر رسید. اسید‌هیومیک نیز تا سطح 3- خشکی و شوری اثر معنی‌داری بر خصوصیات یاد شده داشت. اثر متقابل اسید‌هیومیک و تنش خشکی فقط برای درصد جوانه‌زنی و وزن ریشه‌چه معنی‌دار بود ولی شرایط شوری روی تمامی خصوصیات جوانه‌زنی در سطح یک ‌درصد معنی‌دار بود. به طورکلی، نتایج نشان داد که جوانه‌زنی بذرهای سرخارگل تا حدودی شرایط تنش خشکی را بهتر از شرایط شوری تحمل می‌کند. همچنین پیش‌تیمار بذر توسط اسید‌هیومیک در مناطق شور و خشک می‌تواند باعث مقاومت بذر گیاه دارویی سرخارگل در مرحله جوانه‌زنی شود.

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