نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد، گروه باغبانی، پردیس ابوریحان، دانشگاه تهران، پاکدشت، ایران
2 استادیار گروه باغبانی، پردیس ابوریحان، دانشگاه تهران، پاکدشت، ایران
چکیده
بیوسنتز رنگیزه‌های گیاهی به‌شدت تحت تأثیر عوامل محیطی به‌ویژه شدت نور قرار می‌گیرد. به‌منظور بررسی تأثیر شدت‌های مختلف نور بر غلظت رنگیزه‌های فتوسنتزی در برگ و غیرفتوسنتزی در گلبرگ دو رقم رز تجاری، شدت‌های مختلف نور شامل 240، 520، 640 و 1200 (شاهد، بدون استفاده از تور) میکرومول بر متر مربع بر ثانیه با استفاده از تورهای پلاستیکی روی بوته‌های دو رقم رز (‘ردوان’ و ‘گلمیرا’) اعمال شد. نتایج تجزیۀ واریانس داده‌ها، اختلاف معناداری را در مقدار کلروفیل کل و کاروتنوئید در تأثیرات اصلی شدت‌های مختلف نور نشان داد، به‌طوری‌که در شدت نور 240 میکرومول بر متر مربع بر ثانیه، مقدار کلروفیل کل و کاروتنوئید افزایش یافت و در تیمار شاهد از مقدار آنها کاسته شد. همچنین در شدت نور 240 میکرومول بر متر مربع بر ثانیه، کمترین مقدار آنتوسیانین تولید شد. نتایج این آزمایش نشان داد که با کاهش شدت نور تا 240 میکرومول بر متر مربع بر ثانیه، غلظت کلروفیل افزایش می‌یابد. همچنین همراه با افزایش کلروفیل در شدت نور 240 میکرومول بر متر مربع بر ثانیه، کاروتنوئیدهای برگ رز افزایش یافتند. اگرچه اختلاف معناداری در غلظت فلاونوئید مشاهده نشد، تجمع آنتوسیانین در شدت نور 1200 میکرومول بر متر مربع بر ثانیه نشان می‌دهد که تأثیر این ماده، سازوکاری حفاظتی برای گیاهان در برابر سطوح مضر نور بوده است.
کلیدواژه‌ها
عنوان مقاله [English]
Photosynthetic and nonphotosynthetic pigments of two rose cultivars under different light intensities
نویسندگان [English]
- Mansoure Hatamian 1
- Mostafa Arab 2
- Mahmoud Reza Roozban 2
1 M.Sc. Student, Department of Horticulture, College of Aburaihan, University of Tehran, Pakdasht, Tehran, Iran
2 Assistant Professor, Department of Horticulture, College of Aburaihan, University of Tehran, Pakdasht, Tehran, Iran
چکیده [English]
Biosynthesis of plant pigments is affected by environmental factors especially light intensity. An expriment was conducted to evaluate the effect of different light intensities on photosynthetic and non-photosynthetic pigments of two rose cultivars including ‘Red One’ and ‘Gulmira’ under greenhouse conditions. In this experiment, the effects of different light intensities including 240, 520 and 640 mol/m2/s and control with 1200 mol/m2/s (without application of plastic nets) on the rose cultivars was evaluated under greenhouse conditions. Plastic nets were used to obtain different levels of light intensities. The results showed that photosynthetic pigments, chlorophyll and carotenoids, significantly increased in the light intensity of 240 mol/m2/s vs. control. In this light intensity, antocyanin content was significantly reduced. Reducing light intensity to 240 mol/m2/s could result in higher chlorophyll as well as carotenoid content without significant changes in flavonoids. Increasing anthocyanin content with increasing light intensity to 1200 mol/m2/s could be a defense mechanism in plants against toxic levels of light intensities.
کلیدواژه‌ها [English]
- Antocyanin
- Carotenoid
- Chlorophyll
- flavonoid
- Light intensity
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