اثر پاکلوبوترازول بر برخی ویژگی های مورفولوژیک و فیزیولوژیک گل اطلسی تحت تنش خشکی
Subject Areas : Journal of Ornamental Plantsنیوشا حاتمی فر 1 , رامین بابادائی سامانی 2
1 - گروه علوم باغبانی، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران
2 - استادیار گروه علوم باغبانی، واحد استهبان، دانشگاه آزاد اسلامی، استهبان، ایران
Keywords: نشت یونی, کلروفیل, وزن خشک, کاروتنوئید, آنتی جیبرلین,
Abstract :
این آزمایش به منظور بررسی تاثیر پاکلوبوترازول به عنوان یک آنتی‌جیبرلین بر برخی ویژگی های مورفوفیزیولوژیک گل اطلسی و تعیین مناسب‌ترین غلظت پاکلوبوترازول برای ایجاد مقاومت به تنش خشکی در این گیاه انجام شد. آزمایش به صورت فاکتوریل در قالب طرح کاملا تصادفی با سه تکرار در گلخانه اجرا شد. پاکلوبوترازول در 4 سطح (شامل غلظت‌های صفر، 25، 50 و 75 میلی‌گرم در لیتر) و تنش خشکی در سه سطح (آبیاری هنگام رسیدن رطوبت خاک به 90 درصد ، 75 درصد و 50 درصد ظرفیت زراعی) فاکتورهای مورد بررسی در این آزمایش بودند. نتایج نشان داد که استفاده از پاکلوبوترازول باعث افزایش تعداد گل، وزن خشک اندام هوایی و تعداد شاخه فرعی شده است و استفاده از این ماده باعث کاهش ارتفاع بوته، وزن خشک ریشه و مقدار کاروتنوئید گردید. در حالی که پاکلوبوترازول اثر معنی‌داری بر میزان نشت یونی، تعداد شاخه اصلی و مساحت برگ نداشت. همچنین نتایج نشان داد که تنش خشکی باعث افزایش تعداد گل در بوته گردید و کاهش محتوای کلروفیل، کاروتنوئید، قطر گل، وزن خشک اندام هوایی و ریشه گیاه و سطح برگ اطلسی را در پی داشت. غلظت 75 میلی‌گرم در لیتر پاکلوبوترازول بیشترین تاثیر را در کنترل ارتفاع اندام رویشی گیاه اطلسی تحت تنش خشکی از خود نشان داد. از طرفی با افزایش غلظت پاکلوبوترازول تحت تنش 50 درصد ظرفیت زراعی روند افزایشی در میزان کاروتنوئید و کلروفیل کل دیده شد . به طور کلی می‌توان استنباط کرد که پاکلوبوترازول توانسته است مانع کاهش مقدار کلروفیل و کاروتنوئید تحت شرایط تنش شدید خشکی شود و استفاده از آن تا حدی در غلبه بر عوارض جانبی ناشی از تنش خشکی موثر است.
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