نوع مقاله : مقاله پژوهشی
نویسنده
عضو هیئت علمی دانشگاه جیرفت
چکیده
این تحقیق با هدف تعیینشرایط بهینه جوانهزنی بذر و رشد گیاهچه و اثر برخی تنش‌های غیرزنده بر گیاه چغندر‌برگی (Betavulgaris var. cicla)، با آزمایش‌های جداگانه، دمای ثابت (10، 15، 20، 25، 30 و 35 درجه سانتی‌گراد)، دمای متناوب (10/20، 15/25 و 20/30 درجه سانتی‌گراد)، آبشویی (صفر، 6، 12، 18 و 24 ساعت)، شوری (صفر، 44.8، 89.7، 134، 179، 224 و 336 میلی مولار)، اسیدیته (5، 6، 7، 8، 9 و 10) در قالب طرح کاملاً تصادفی و آزمایش خشکی (صفر، 0.2-، 0.4-، 0.6-، 0.8- و 1- مگاپاسکال) و دما (25، 20 و 15 درجه سانتی‌گراد) به‌صورت فاکتوریل در قالب طرح کاملاً تصادفی با سه تکرار‌انجام شد.نتایج نشان داد دمای کمینه 1.24±1.92، بهینه 0.74±25 و بیشینه جوانهزنی 1.67±45.8 درجه سانتی‌گراد است. حداکثر سرعت جوانهزنی در دمای متناوب 10/20 درجه سانتی‌گراد مشاهده شد. هیدرو پرایم 18 ساعته، 38 درصد جوانهزنی بذر را افزایش داد. سطحی از شوری که جوانهزنی را به نصف کاهش داد 7.4±186 میلی‌مولار بود. تغییراسیدیته محیط، از 7 به 5 و 9 به ترتیب جوانهزنی را 28.3 و 15 درصد کاهش داد. در دمای 25، 20 و 15 درجه سانتی‌گراد به ترتیب، پتانسیل آب پایه 0.96-، 0.80- و 0.78- مگاپاسکال برآورد شد. برطبق نتایج حاصل، چغندر برگی در مرحله جوانهزنی و رشد اولیه، گیاه پرتوقعی نبوده و با 17.3 درصد جوانهزنی و توانایی سازگاری در سطح شوری 336 میلی‌مولار، جهت کشت و کار در مناطق شور قابل توصیه است.
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