Effect of Light Combination and Timing of Supplemental Lighting on Growth Characteristics and Flowering of Pansy (Viola × wittrockiana Rose)
محورهای موضوعی : مجله گیاهان زینتی
Azadeh Rashidi
1
(Department of Horticultural Science and Landscape, International Campus, Ferdowsi University of Mashhad, Iran)
Ali Tehranifar
2
(Professor, Department of Horticultural Science and landscape, Ferdowsi University of Mashhad, Iran)
Hossein Nemati
3
(Assistant Professor/Department of Horticultural Science and Landscape , Ferdowsi University of Mashhad,Iran)
کلید واژه: Photoperiod, Light quality, Day-extension, LEDs, Night-interruption,
چکیده مقاله :
The goal of this study was to examine how different light combinations and timing of supplemental lighting affect the vegetative and reproductive responses of pansy (Viola × wittrockiana Rose). The present study was designed as a factorial experiment based on a completely randomized block design with three replications and two factors of timing of supplemental lighting (night-interruption and day-extension) and light combination treatments consisting of different proportion of blue (B, 467 nm) and red (R, 625 nm) light with high pressure sodium lamp (HPS) serving as control. The light combination treatments (65 mmol m-2 s-1) included 100% R, 85% R: 15% B, 70% R: 30% B, and HPS. Our results showed that the plants exposed to 85% R: 15% B had the highest foliage fresh and dry weights (2.06 g and 0.23 g), stem diameter (1.42 mm), leaf area (44.72 cm2), and leaf number (16.5), and plants exposed to 100% R had the highest root fresh and dry weights (1.63 g and 0.39 g) and height (6.17 cm), respectively. The results showed a significant interaction between light combination and the timing of supplemental lighting on Chl a, Chl b, Chl total, and carotenoids contents and flowering time. Night-interruption supplemental lighting in exposure to 85% R: 15% B led to the highest Chl a (0.86 mg g-1 FW), Chl b (0.52 mg g-1 FW) and Chl total (1.51 mg g-1 FW) contents. The highest carotenoids content (0.69 mg FW) was obtained from night-interruption supplemental lighting under 70% R: 30% B. Night-interruption supplemental lighting was related to the shortest time to flowering (56 days after seed sowing), but it did not differ significantly from day-extension supplemental lighting under 70% R: 30% B.
هدف از این تحقیق بررسی تاثیر ترکیبات مختلف نور و مقطع زمانی کاربرد نور مکمل بر نحوه رشد رویشی و زایشی بنفشه (Viola × wittrockiana Rose) بود. این پژوهش با استفاده از آزمایش فاکتوریل بر پایه طرح بلوک کامل تصادفی با سه تکرار و دو عامل مقطع زمانی کاربرد نور مکمل (شب شکنی و انتهای روز) و ترکیبات متفاوت نور شامل نسبت‌های مختلف نور آبی (طیف 467 نانومتر) و قرمز (625 نانومتر) به همراه نور لامپ پرفشار سدیم به عنوان شاهد انجام گرفت. تیمار ترکیبات نور (شدت 65 میکرومول بر متر مربع بر ثانیه) شامل 100٪ قرمز، 15٪ آبی: 85٪ قرمز، 30٪ آبی:70٪ قرمز و پرفشار سدیم بود. نتایج نشان داد که گیاهان با کاربرد ترکیب نوری 15٪ آبی: 85٪ قرمز بیشترین وزن تر و خشک برگسار (06/2 گرم و 23/0 گرم)، قطر ساقه (42/1 میلی‌متر)، سطح برگ (72/44 سانتی‌متر مربع)، تعداد برگ (5/16) و با کاربرد نور قرمز بیشترین وزن تر و خشک ریشه (63/1گرم و 39/0گرم) و بیشترین ارتفاع (17/6 سانتی‌متر) را داشتند. نتایج بیانگر اثر معنی‌دار برهمکنش مقطع زمانی بکارگیری نور مکمل و ترکیبات نور بر محتویات کلروفیلa، کلروفیلb، کلروفیل کل، کارتنویید و زمان گلدهی بود. کاربرد ترکیب نوری 15٪ آبی: 85٪ قرمز به صورت شب‌شکنی منجر به بیشترین محتویات کلروفیل a (86/0میلی‌گرم در گرم وزن تازه)، کلروفیلb (52/0 میلی‌گرم در گرم وزن تازه) و کلروفیل کل (51/1 میلی‌گرم در گرم وزن تازه) شد. بیشترین محتویات کارتنویید (69/0 میلی‌گرم در گرم وزن تازه) با کاربرد ترکیب نوری 30٪ آبی: 70٪ قرمز به صورت شب‌شکنی و کوتاه‌ترین زمان گلدهی (56 روز بعد از کاشت بذر) با کاربرد ترکیب نوری30% آبی: 70% قرمز به صورت شب‌شکنی و بدون اختلاف معنی‌دار با کاربرد این ترکیب نوری در انتهای روز بدست آمد.
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