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Potential benefits and phytotoxicity of bulk and nano-chitosan on the growth, morphogenesis, physiology, and micropropagation of Capsicum annuum.
Plant Physiology and Biochemistry : PPB 2018 June
Concerning environmental issues of metal based-nanomaterials and increasing demand for nano-based products; various strategies have been employed to find eco-friendly natural nano-compounds, among which nano-polymer chitosan is mostly considered. Herein, the various aspects of the way in which bulk or nano-chitosan may modify growth, morphogenesis, micropropagation, and physiology of Capsicum annuum L. were considered. Culture medium was manipulated with different concentrations of bulk chitosan or synthesized chitosan/tripolyphosphate (TPP) nano-particle. The supplementations of culture media led to changes in morphology (especially, the root architecture) and differentiation. Toxic doses of bulk (100 mgL-1 ) or nano-chitosan (5, 10, and 20 mgL-1 ) dramatically provoked cessation of plant growth and development. Plant growth and biomass accumulations were increased along with the suitable levels of bulk or nano-chitosan. Peroxidase and catalase activities in a dose and organ-dependent manners were significantly modified by the supplements. Phenylalanine ammonia lyase was induced by the mentioned supplements. Also, the contents of soluble phenols, proline, and alkaloid were found to be significantly increased by the elicitors, over the control. The nano-chitosan of 1 mgL-1 was found to be the most effective elicitor to trigger organogenesis via micropropagation. The huge differences between triggering and toxic concentrations of the supplements would be due to the physicochemical modifications of nano-polymeric. Furthermore, the results highlight the potential benefits (hormone-like activity) and phytotoxic impacts of nano-chitosan/TPP for in vitro manipulations. This is the first report on both the favorable and adverse effects of nano-chitosan/TPP, representing requirements for further investigation on such formulations for future applications.
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