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

Document Type : Research Paper

Authors

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

Abstract

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.

Keywords

References

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Iranian Journal of Seed Sciences and Research
Volume 7, Issue 4
January 2021
Pages 417-431

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