Effect of Silicon Si Application on Phoenix dactylifera L. Growth under Drought Stress Induced by Polyethylene Glycol PEG in VitroReport as inadecuate




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This study was carried out to investigate theeffects of silicon Si 3.6 mM as calcium silicate under drought stressinduced by polyethylene glycol -PEG- at 15% MW 8000, in addition to thecontrol treatment on growth and some biochemical constituents of date palm cv.Barhee cultured in vitro. Drought stress 15% PEG depressed the growthof shoot and decreased protein content and chlorophyll concentration. Additionof 3.6 mM Si could improve the growth of shoot and increase the protein contentand leaf chlorophyll concentrations of stressed plants. The inclusion of Si tothe PEG containing medium significantly increased the catalase CAT andsuperoxide dismutase SOD activity in regenerated shoot, compared to othertreatments. As well as drought stress 15% PEG induced significant accumulationof shoots proline, which were decreased by added silicon. Moreover, the resultswere also supported by the observation that PEG stress-induced decrease theresponse percentage of root induction and root lengths was reversed by addedsilicon. Addition of Si obviously significantly increased the wax content inleaves, response percentage of root induction and root lengths of plantlets underdrought stress. The results of this study indicate that the application ofsilicon improved growth attributes, effectively mitigate the adverse effect ofdrought, and increase tolerance of date palm plants for drought stress duringthe course of date palm tissue cultures.

KEYWORDS

Silicon Si, Drought Stress, Polyethylene Glycol PEG, Tissue Culturing, Antioxidant Activity, Waxy Layer

Cite this paper

Al-Mayahi, A. 2016 Effect of Silicon Si Application on Phoenix dactylifera L. Growth under Drought Stress Induced by Polyethylene Glycol PEG in Vitro. American Journal of Plant Sciences, 7, 1711-1728. doi: 10.4236-ajps.2016.713161.





Author: Ahmed Madi Waheed Al-Mayahi

Source: http://www.scirp.org/



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