Investigating and comparing the morphological and biochemical characteristics of annual seedling Choj and Conocarpus plants under salt stress

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Horticultural Science, Faculty of Agriculture, Azad University Jahrom, Jahrom, Iran

2 PhD Student, Department of Horticultural Science, Faculty of Agriculture, Azad University Jahrom, Jahrom, Iran

10.29252/aridbiom.2023.20709.1964

Abstract

The aim of this study was investigating and comparing the morphological and biochemical characteristics of Choj (Salvadora persica) and Conocarpus (Conocarpus erectus) plants under salinity stress and the possibility of replacing Choj plants insteade of Conocarpus trees in landscape. Three-month-old seedlings with similar morphology and height were prepared for both species. The factors used in this study were species (include Choj and Conocarpus) and salinity (include control or city water, 250, 500, and 750 mM/L of sodium chloride salt), which were investigated on both plants for 6 months. The experiment was factorial based on a completely randomized design with three replications (pots). Morphological traits (fresh and dry leaves weight, fresh and dry roots weight, stem diameter, leaf surface), biochemical (chlorophyll a and b, total protein, proline, total carbohydrate) and mineral elements (sodium, potassium, calcium and chlorine) were measured for each plant. Results showed that except dry weight of leaves and fresh and dry weight of roots, other morphological traits of Choj and Conocarpus were not affected by salinity stress. With increasing salinity levels, leaf dry weight and root fresh and dry weight showed a significant decrease. Salinity stress had no significant effect on chlorophyll a, total protein, proline and total carbohydrates, but chlorophyll b was affected by salinity stress and the amount of chlorophyll b increased with increasing salinity levels. The highest amounts of chlorophyll a and total carbohydrates were found in the Conocarpus and the highest amounts of chlorophyll a, total protein and proline were obtained in the Choj plant. Salinity stress had no significant effect on the percentage of sodium, potassium, calcium, and chlorine mineral elements in Choj and Conocarpus plants. In general, the Choj plant, which has a high tolerance to salinity and drought, can be a suitable alternative to Conocarpus plant for creating hedges, planting in gardens and landscape. However, the sensitivity of the Choj plant to cold, its slower growth and its more difficult formability should be taken into account.

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Main Subjects

References

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Journal of Arid Biome
Volume 13, Issue 1
April 2023
Pages 139-150

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