بررسی اثر جیبرلیک‌اسید و طیف‌های مختلف نور LED بر کیفیت نشاء Cyclamen persicum Mill.

علوم باغبانی

مقاله 21، دوره 36، شماره 1 - شماره پیاپی 53، خرداد 1401، صفحه 307-318   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jhs.2021.71343.1071

نویسندگان

بدری غلامیان دهکردی؛ سعید ریزی^* ؛ مسعود قاسمی قهساره

گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد، ایران

چکیده

به­منظور بررسی تاثیر طیف­های نور LED و جیبرلیک­اسید (GA₃) بر کیفیت نشاء سیکلمن (Cyclamen persicum) آزمایشی به­صورت فاکتوریل در قالب طرح کاملاً تصادفی انجام شد. گیاهان از مرحله جوانه­زنی به­مدت چهار ماه تحت تاثیر دو سطح از طیف­های نوری LED شامل نسبت­های 70: 20: 10 و 40: 40: 20 درصد با رنگ­های سفید: قرمز: آبی با شدت یکسان 100 میکرو­مول بر متر­مربع بر ثانیه، در محفظه­ای طراحی شده (که عوامل محیطی تا حد امکان در آن تحت کنترل بود) قرار گرفتند و GA₃ در چهار غلظت صفر، 20، 40 و 60 میلی­گرم بر­لیتر و در سه نوبت روی برگ­ها افشانش شد. بر اساس نتایج، بیشترین تعداد برگ و سطح برگ به­ترتیب در تیمار 40: 40: 20 و 70: 20: 10 مشاهده شد. طول ریشه در غلظت 60 میلی­گرم بر لیتر GA₃ افزایش یافت و نزدیکترین تاریخ گلدهی گیاه از برهمکنش تیمار 70: 20: 10 و غلظت صفر میلی­گرم بر لیتر GA₃ بدست آمد. بیشترین مقدار کلروفیل b و قند محلول برگ از برهمکنش تیمار 40: 40: 20 و غلظت صفر میلی­گرم بر­لیتر GA₃ مشاهده شد. شاخص‌های Ψ-₀ (حداکثر عملکرد کوانتومی فتوشیمیایی اولیه) و φ-E₀ (عملکرد کوانتومی انتقال الکترون) در غلظت صفر میلی­گرم بر لیتر GA₃ و V_J (فلورسنس متغیر نسبی) در غلظت 40 میلی­گرم بر­لیتر GA₃ افزایش یافت. بالاترین میزان ABS/RC (تراکم مرکز واکنش به­ازاء مقدار انرژی نورانی جذب شده) از برهمکنش تیمار 40: 40: 20 و غلظت 60 میلی­گرم بر لیتر GA₃ بدست آمد. نتایج این تحقیق نشان می­دهد کاربرد تجاری لامپ­های LED برای پرورش نشاء سیکلمن برای دستیابی به­نتایج مشابه با این پژوهش باید با در نظر گرفتن سایر هزینه­ها با احتیاط انجام شود.

کلیدواژه‌ها

تاریخ گلدهی؛ سطح برگ؛ طول ریشه؛ فلورسانس کلروفیل؛ قند محلول

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