بررسی اثر کیفیت نور بر جوانه‌زنی و برخی ویژگی‌های فیزیکوشیمیایی گیاهچه‌های سنبل‌الطیب ((Valeriana officinalis

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

2 دانشیار، گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

به­منظور مطالعه اثر کیفیت نور بر شاخص‌های جوانه‌زنی بذر و خصوصیات رویشی نشای سنبل‌الطیب، آزمایشی در قالب طرح کاملا تصادفی باسه تکرار انجام شد. تیمارهای مورد استفاده شامل ترکیب نور در چهار سطح (قرمز، 15 درصد آبی + 85 درصد قرمز،30 درصد آبی +70 درصد قرمز و نور لامپ‌های فلورسنت) بودند. نتایج این آزمایش نشان داد که بیش­ترین درصد جوانه‌زنی (63 درصد)، سرعت جوانه‌زنی (87/41)، میانگین جوانه‌زنی روزانه (21/9)، ارزش جوانه‌زنی (81/68)، ارزش حداکثر (50/7) و کم­ترین میانگین زمان جوانه‌زنی (66/2) با کاربرد نور قرمز به­دست آمد. بیش­ترین وزن خشک ساقه‌چه (36/0 میلی‌گرم در گیاهچه)با کاربرد نور قرمز و ترکیب‌ 15درصدآبی + 85 درصد قرمز، بیش­ترین وزن خشک ریشه‌چه (3/0 میلی‌گرم در گیاهچه) با ترکیب‌30 درصدآبی +70 درصد قرمز و 15 درصدآبی + 85 درصد قرمز، بیش­ترین طول ساقه‌چه و ریشه‌چه (18/1 و 03/3 سانتی‌متر) با نور قرمز و ترکیب 15درصد آبی + 85 درصد قرمز، بیش­ترین میزان قند محلول ریشه‌چه و ساقه‌چه (37/63 و 54/72 میلی‌گرم در گرم وزن تازه) با نور قرمز و ترکیب 15 درصد آبی + 85 درصد قرمز، بیش­ترین مقدار کلروفیل a، b و کل (37/0، 47/0 و 84/0 میلی‌گرم در گرم وزن تر)،کارتنوئید (44/0 میلی‌گرم در گرم وزن تر) با ترکیب30 درصد آبی +70 درصد قرمز، بیش­ترین فعالیت آنتی‌اکسیدانی ریشه‌چه و ساقه‌چه (09/60 درصد و 04/71 درصد) با ترکیب‌30 درصد آبی +70 درصد قرمز و 15 درصد آبی + 85 درصد قرمز، بیش­ترین محتویات فنلی ریشه‌چه و ساقه‌چه (40/4 و 65/8 میلی‌گرم در گرم وزن تازه) با ترکیب‌ 30 درصد آبی +70 درصد قرمز و 15 درصد آبی + 85 درصد قرمز به­دست آمد. نتایج این آزمایش بیانگر امکان بهبود یافتن شاخص‌های جوانه‌زنی و رویشی گیاهچه‌های سنبل‌الطیب با کاربرد ترکیب‌های نورهای آبی و قرمز در مقایسه با نور لامپ فلورسنت بود.

کلیدواژه‌ها


عنوان مقاله [English]

The effect of light quality on germination and some physicochemical characteristics of valerian (Valeriana officinalis) seedlings

نویسندگان [English]

  • Azadeh Rashidi 1
  • Rasoul Narimani 1
  • Mohammad Moghaddam 2
1 Ph.D. Student, Department of Horticulture Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
2 Associate Professor, Department of Horticulture Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده [English]

To investigate the effect of light quality on germination indices and some vegetative traits of valerian seedlings, a research was conducted as completely randomized design with three replications and light combinations in four levels (R light, 15% B + 85% R , 30% B + 70% R and fluorescent light) were used. The results showed that the highest percentage of germination (63%), germination rate (%41.87), mean daily germination (9.21), germination value (68.81), peak value (7.50) and lowest mean time to germination (2.66) were obtained under R light.The highest dry weight of plumule (0.36 mg/seedling) were obtained under R light and 15%B + 85%R ratio. The highest dry weight of radicle (0.3 mg/seedling) were acquired under30%B + 70% R and 15%B + 85%R ratios. The highest length of plumule and radicle (1.18 and 3.03 cm, respectively) were obtained under R light and 15%B + 85%R ratio. The highest amount of radicle and plumule soluble sugar (63.37 and 72.54 mgg
-1
FW, respectively) were acquiredunder R light and 15%B + 85%Rratio. The highest amount of chlorophyll a, b, totalchlorophyll (0.37, 0.47, 0.84 mg g
-1
FW, respectively) and carotenoids (0.44 mg g
-1
FW) were obtained under 30%B + 70%Rratio, the highest amount of radicle and plumule antioxidant activity (60.09% and 71.04%) under 30%B + 70%R and 15%B + 85%Rratios and the highest amount of radicle and plumule phenolic compounds (4.40 and 8.65 mg g
-1
FW, respectively) under 30%B + 70%R and 15%B : 85%Rratios were obtained. The results of this experiment showed that it is possible to improve germination indices and biochemical and vegetative traits of valerian seedlings by the usage of the R and B spectra compare with fluorescent light.To investigate the effect of light quality on germination indices and some vegetative traits of valerian seedlings, a research was conducted as completely randomized design with three replications and light combinations in four levels (R light, 15% B + 85% R , 30% B + 70% R and fluorescent light) were used. The results showed that the highest percentage of germination (63%), germination rate (%41.87), mean daily germination (9.21), germination value (68.81), peak value (7.50) and lowest mean time to germination (2.66) were obtained under R light.The highest dry weight of plumule (0.36 mg/seedling) were obtained under R light and 15%B + 85%R ratio. The highest dry weight of radicle (0.3 mg/seedling) were acquired under30%B + 70% R and 15%B + 85%R ratios. The highest length of plumule and radicle (1.18 and 3.03 cm, respectively) were obtained under R light and 15%B + 85%R ratio. The highest amount of radicle and plumule soluble sugar (63.37 and 72.54 mgg
-1
FW, respectively) were acquiredunder R light and 15%B + 85%Rratio. The highest amount of chlorophyll a, b, totalchlorophyll (0.37, 0.47, 0.84 mg g
-1
FW, respectively) and carotenoids (0.44 mg g
-1
FW) were obtained under 30%B + 70%Rratio, the highest amount of radicle and plumule antioxidant activity (60.09% and 71.04%) under 30%B + 70%R and 15%B + 85%Rratios and the highest amount of radicle and plumule phenolic compounds (4.40 and 8.65 mg g
-1
FW, respectively) under 30%B + 70%R and 15%B : 85%Rratios were obtained. The results of this experiment showed that it is possible to improve germination indices and biochemical and vegetative traits of valerian seedlings by the usage of the R and B spectra compare with fluorescent light.

کلیدواژه‌ها [English]

  • Light quality
  • Light spectrum
  • Phenolic compounds
  • Phytochrome
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