بنزیل آدنین نسبت به سیلیکات پتاسیم در کاهش اثرات مضرتنش گرما بر فلفل موثرتر است

نوع مقاله : مقاله کامل

نویسندگان

گروه باغبانی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، اصفهان، ج. ا. ایران

چکیده

چکیده- تنش گرما موجب ریزش گل و میوه در فلفل می­گردد. این پژوهش در گلخانه­های دانشگاه صنعتی اصفهان به منظور ارزیابی تاثیر کاربرد برگی بنزیل آدنین (BA) و سیلیکات پتاسیم (K2SiO3) تحت شرایط تنش گرما بر فلفل دلمه­ای انجام شد. دو آزمایش فاکتوریل بر اساس طرح کاملا تصادفی با چهار غلظت BA (0، 06/0، 6/0و 6 پی پی ام) و دومین بار با دو سطح K2SiO3(0 و 5 میلی­مولار) در دو تیمار دمایی( اپتیمم (2±25) و دمای بالا (2±35)) با شش تکرار انجام شد. نتایج پژوهش نشان داد که استفاده BA (بخصوص غلظت 6 پی­پی­ام) فاکتورهای رشد را بهبود می­بخشد، پرولین، میزان فنول و محتوای آنتی­اکسیدان را افزایش می­دهد. همچنین کاربرد BA با غلظت 6 پی­پی­ام  پایداری غشا سلولی را بهبود می­بخشد یا نشت یونی را در فلفل دلمه­ای را کاهش می­دهد و همچنین ریزش گل را کاهش می­دهد. بنابراین کاربرد BA اثرمنفی تنش گرما را کاهش می­دهد. BA با غلظت 6 پی­پی­ام، ارتفاع گیاه و ریزش گل را بهبود می­بخشد، کاهش وزن تر و خشک شاخساره و ریشه، پرولین و فنول کل را کاهش می­دهد. وزن تر ریشه و غلظت پتاسیم را افزایش و ریزش گل را کاهش می­دهد. محتوای آنتی­اکسیدان با تنش گرما در همه سطوح BA  افزایش می­یابد. نتایج پژوهش نشان می­دهد که وزن تر و خشک ریشه و غلظت پتاسیم با غلظت سیلیکات پتاسیم 5 میلی­مولار افزایش می­یابد. همچنین، در غلظت 5 میلی­مولار سیلیکات پتاسیم ، وزن تر ریشه و غلظت پتاسیم بهبود و محتوای آنتی­اکسیدان تحت تنش گرما افزایش می­یابد.

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موضوعات


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