Minimizing Salt Stress Negative Effects by Benzyladenine Foliar-Spray Application on Morpho-Physiological and Chemical Characteristics of Hibiscus rosa-sinensis Plant

Document Type : Original Article

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Department of Horticulture, Faculty of Agriculture, Beni-Suef University, Egypt

Abstract

The current study was carried out during the two successive seasons of 2020 and 2021 at Beni-Suef governorate, Egypt, to examine how to mitigate the negative effects of soil salinity (4, 8 and 12 dS/m) on vegetative, root and flowering parameters as well as chemical constituents of Hibiscus rosa-sinensis plants through the use of benzyladenine (25, 50 and 100 ppm). Plant height, leaf area, number of branches/plant, root length, roots fresh and dry weights, flower diameter and fresh and dry weights, photosynthetic pigments and NPK percentages, as well as relative water content were significantly and gradually reduced with the rise in soil salinity concentration, due to the highest salinity level (12 dS/m) the lowest values are presented. In contrast, as the three concentrations of benzyladenine increased, all of studied  characteristics were improved. Maximum reduction was seen at 12 dS/m soil salinity which found higher increase of the free proline content, sodium and chloride percentages. The most effective foliar application of benzyladenine was at 100 ppm. It was evident that salinity and benzyladenine work in opposition to each other for traits under the study in both seasons. The outcomes of the combined treatment with high salinization and high benzyladenine were comparable to those of the un-salinized/un-benzyladenine treatment. These findings imply that benzyladenine treatments had a beneficial impact on morpho-physiological, chemical characteristics and diminished the negative effects of salinity on Hibiscus rosa-sinensis plants.

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