اثر هیدروپرایمینگ و اسموپرایمینگ با GA3 و KNO3 بر جوانه‌زنی بذر ناترک (Dodonaea viscosa) تحت شرایط شوری

علوم باغبانی

مقاله 1، دوره 30، شماره 1، اردیبهشت 1395، صفحه 102-111   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jhorts4.v30i1.37975

نویسندگان

صفدر پورممبنی؛ نوراله معلمی^*

دانشگاه شهید چمران اهواز

چکیده

ناترک (Dodonaea viscosa) درختچه‌ای زینتی، همیشه سبز دایمی و دارای گسترش وسیعی در سرتاسر مناطق گرم دنیا می‌باشد. به منظور بهبود جوانه‌زنی بذر ناترک، اثرات آماده‌سازی (پرایمینگ) و سطوح مختلف شوری بر شاخص‌های جوانه‌زنی بذر این گیاه مورد مطالعه قرار گرفت. در این بررسی دو آزمایش متوالی بصورت طرح کاملاً تصادفی با چهار تکرار انجام شد. در آزمایش اول تیمارها شامل هیدروپرایمینگ (تیمار با آب مقطر به عنوان شاهد) و اسموپرایمینگ شامل (نیترات پتاسیم 5/0 و 1 درصد و اسید جیبرلیک 50 و 100 میلی‌گرم در لیتر) و در آزمایش دوم بر اساس بهترین نتایج آزمایش اول (تیمار اسید جیبرلیک 50 میلی گرم در لیتر) تیمار شوری با کلرید سدیم (0، 3، 6، 9 و 12 دسی‌زیمنس بر متر) مورد مطالعه قرار گرفت. نتایج آزمایش اول نشان داد تیمار اسموپرایمینگ اثر معنی‌داری روی درصد جوانه‌زنی، طول ریشه‌چه و ساقه‌چه و وزن تر ریشه‌چه داشت. اسید جیبرلیک50 میلی‌گرم در لیتر نسبت به بقیه تیمارها موثرتر بود. حداکثر درصد جوانه زنی (68 درصد)، طول ریشه‌چه (25/41 میلی‌متر) و ساقه‌چه (50/71 میلیمتر) و وزن تر ریشه‌چه (12/0 گرم) تحت تاثیر جیبرلیک اسید 50 میلی‌گرم در لیتر بدست آمد. نیترات پتاسیم 1 درصد کمترین تاثیر را بر درصد جوانه‌زنی (50 درصد)، طول ریشه‌چه (75/21 میلی‌متر) و وزن تر ریشه‌چه (06/0) گرم داشت. در آزمایش دوم اسید جیبرلیک 50 میلی‌گرم در لیتر در سطح احتمال 1 درصد بر تمام شاخص‌های جوانه‌زنی اثر معنی‌دار مثبت داشت و در سطح شوری 3 و 12 دسی‌زیمنس بر متر به ترتیب بیشترین و کمترین تاثیر را داشت. بطور کلی اسید جیبرلیک 50 میلی‌گرم در لیتر در سطح شوری 3 دسی‌زیمنس بر متر برای تکثیر ناترک با بذر نتایج بهتری را نشان داد.

کلیدواژه‌ها

پرایمینگ؛ ساقه‌چه و ریشه‌چه

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