نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه علوم باغبانی، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران.

2 دانشیار، گروه علوم باغبانی، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران.

3 استادیار، گروه علوم باغبانی، دانشگاه شهرکرد، شهرکرد، ایران.

چکیده

درصد و سرعت جوانه‌زنی بذرها یکی از عوامل دستیابی به عملکرد بالا در کشاورزی است ولی تحت تاثیر تنش‌های محیطی کاهش می‌یابد. پیش تیمار بذرها یکی از روش‌های افزایش قدرت و سرعت جوانه‌زنی بذرها برای مقابله با تنش شوری است. هدف از مطالعه حاضر بررسی تأثیر پیش تیمار بذر با عصاره‌ گیاه نعناع فلفلی (5/0، 1 و 2 درصد) و عصاره جلبک دریایی (05/0، 1 و 2 درصد) به همراه شاهد بر شاخص‌های رشدی و بیوشیمیایی گیاهچه گیاه دارویی آویشن دنایی در شرایط تنش شوری (0، 50، 100، 150 میلی‌مولار کلرید سدیم) بود. این آزمایش گلدانی به صورت فاکتوریل در قالب طرح کاملاً تصادفی در چهار تکرار انجام گرفت. نتایج نشان داد پیش‌تیمار عصاره جلبک دریایی و نعناع فلفلی باعث افزایش درصد و سرعت جوانه‌زنی و همچنین تعداد بذر جوانه زده در شرایط عدم تنش شوری شده بود. در صفات رشدی گیاهچه هر چند در شرایط عدم تنش شوری شرایط بهتر بود ولی پیش تیمار بذرها نسبت به شرایط کنترل اثرات تنش شوری را بطور معنی‌داری کاهش داد. بالاترین میزان کلروفیل کل در شرایط عدم تنش شوری در بذور تیمار شده با عصاره جلبک دریایی 2 درصد بود. بیشترین فعالیت آنزیم کاتالاز و آنزیم پلی فنل اکسیداز به ترتیب در شرایط تنش شوری 100 و 150 میلی مولار و در بذور تیمار شده با عصاره جلبک دریایی 1 و 2 درصد، بود. بطور مشخص تنش شوری موجب کاهش شاخص‌های رشدی شده بود ولی پیش‌تیمار عصاره جلبک دریایی باعث بهبود شرایط شده بود.

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