نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه علوم باغبانی دانشکده کشاورزی دانشگاه تهران - تهران- کرج
2 گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران
چکیده
تحقیق در مورد تاثیر تنش شوری و خشکی بر جوانه زنی و الگوی رشد در بین جمعیت علف‌های مرتعی برای تعیین پتانسیل گونه‌های مناسب جهت ترمیم و حفاظت و همچنین تولید علوفه بسیار مهم است. به این منظور پژوهشی جهت ارزیابی تنش شوری و خشکی گیاه ریش پری دو شاخ در مرحله جوانه زنی و رشد گیاهچه سال 1399در آزمایشگاه بذر دانشکده کشاورزی دانشگاه تهران- کرج در قالب طرح کاملا تصادفی و در 3 تکرار انجام گردید. تیمارهای این آزمایش شامل 4 سطح شوری (100،150،200 و 300 میلی مولار سدیم کلرید)، 4 سطح خشکی (2-، 4-، 6- و 8- بار پلی اتیلن گلیکول) و آب مقطر (شاهد) بود. صفات مورد ارزیابی شامل درصد جوانه‌زنی، سرعت جوانه‌زنی، طول ساقه‌چه و طول ریشه‌چه بود. نتایج نشان داد درصد جوانه‌زنی، سرعت جوانه‌زنی، طول ریشه‌چه و طول ساقه‌چه با افزایش شدت تنش شوری تا 200 میلی مولار افزایش و پس از آن کاهش یافت به طوری که عملا هیچ بذری جوانه نزد. در تنش خشکی صفات مورد مطالعه تا 6- بار افزایش یافته و پس از آن شروع به کاهش کردند. نتایج نشان داد گیاه ریش پری دو شاخ گیاهی نسبتا مقاوم به تنش شوری و خشکی می‌باشد.
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