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Effect of colchicine-induced polyploidy on morphological characteristics and essential oil composition of ajowan (Trachyspermum ammi L.)

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Abstract

Polyploidy is an amazing evolutionary event that can be used in plant breeding to improve plant material. The present study was conducted to assess the effect of in vitro-induced polyploidy on different properties of Ajowan medicinal plant. Five different concentrations of colchicine, including 0.025, 0.05, 0.1, 0.2, and 0.5% (w/v), were applied to germinating seeds of ajowan in six different durations of exposure, including 6, 12, 24, 36, and 48 h. Chromosome counting showed successful duplication of chromosome number in tetraploid plants (2n = 4x = 36) in contrast with intact diploid plants (2n = 2x = 18). DNA content duplication in induced tetraploid plants was proved through flow cytometry analysis. The highest tetraploidy induction was achieved by applying 0.05% (w/v) colchicine for 24 h with 11.53% efficiency. The tetraploid plants achieved were larger than their diploid intact plants for plant height, leaf length, stem diameter, inflorescence length, peduncle length, and seed length characteristics. The length and width of stomata were increased in induced tetraploid plants, whereas stomata density was decreased, in contrast with initial diploid plants. Gas chromatography mass spectrometry (GC/MS) analysis showed significant increases in thymol content in essential oil of tetraploid plants (69.2%) in contrast with those of diploid plants (49.67%).

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Abbreviations

ANOVA:

Analysis of variance

FCM:

Flow cytometry

GC/MS:

Gas chromatography mass spectrometry

LSD:

Least significant difference

MS:

Murashige and Skoog medium

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Acknowledgements

The authors are thankful to Dr M.H Asare, the secretary of science and technological development staff of medicinal plants and traditional medicine of Islamic Republic of Iran for his kindness helps in financial support of this research. Also the authors are thankful to the Research Institute of Forests and Rangelands of Iran for procuring the seeds.

Author contributions

MNI and SASN wrote the manuscript. KS and MNO performed tetraploidy experiments. GK helped to improve the manuscript.

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Correspondence to Mohsen Niazian.

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The authors declare that they have no conflicts of interest to disclose.

Ethical standards

The experiments were performed according to the current laws of Islamic Republic of Iran.

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Communicated by Maria Antonietta Germanà.

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Sadat Noori, S.A., Norouzi, M., Karimzadeh, G. et al. Effect of colchicine-induced polyploidy on morphological characteristics and essential oil composition of ajowan (Trachyspermum ammi L.). Plant Cell Tiss Organ Cult 130, 543–551 (2017). https://doi.org/10.1007/s11240-017-1245-0

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  • DOI: https://doi.org/10.1007/s11240-017-1245-0

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