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Biomolecular Structure and Composition Changes in the Root System of Long-Lipped Serapias (Serapias vomeracea) After In Vitro Chitosan and Plant Growth Regulator Treatments

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Abstract

In the current study, effects of chitosan oligomers (CHI-OM) with different polymerization degrees (DP) between 2 and 15, and polymeric chitosan (CHI-P) with a DP of 70 were compared with kinetin (KIN), 6-benzylaminopurine (BAP), indole-3-butyric acid (IBA), indole-3-acetic acid (IAA), and jasmonic acid (JAS) on the structure and composition of several biomolecules in the root system of Serapias vomeracea. Evaluation of molecular alterations in the root system of S. vomeracea through an infrared spectroscopic approach provided insight into the differentiation between action mechanisms of chitosan and commonly used plant growth regulators. The results revealed that CHI-P and JAS treatments at low concentrations might enhance the lignin content in the cell walls. Also, JAS, CHI-OM, and CHI-P treatments enhanced cell wall lignification. The water-associated cellulose content of the cell walls was affected by the DP of chitosan. Membrane lipid stabilization and protein content were enhanced after CHI-P, JAS, and KIN treatments, while BAP and CHI-OM treatments triggered lipid, protein, and cell wall polysaccharide synthesis. In particular, CHI-OM treatment also enhanced rhamnogalacturonan and β-galactan content as well as xyloglucans and glucomannans, while the auxin treatments had a similar impact only on glucomannan content. These findings suggest that chitosan may show either purine-based cytokinin-like or lipid-based jasmonic acid-like activity in the root system of S. vomeracea. Additionally, depending on its degree of polymerization, the effects of chitosan may vary on root system development in S. vomeracea.

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Acknowledgements

The chitosan samples were supplied by Nour Eddine El Gueddari of the University of Münster, Münster, Germany. Nour Eddine El Gueddari passed away on February 8, 2018.

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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AA designed and performed the experiments and analyzed the data. AA and STK wrote the manuscript. All authors read and approved the final manuscript.

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Correspondence to Arda Acemi.

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Acemi, A., Türker-Kaya, S. Biomolecular Structure and Composition Changes in the Root System of Long-Lipped Serapias (Serapias vomeracea) After In Vitro Chitosan and Plant Growth Regulator Treatments. J Plant Growth Regul 40, 1315–1326 (2021). https://doi.org/10.1007/s00344-020-10191-4

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  • DOI: https://doi.org/10.1007/s00344-020-10191-4

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