Yahia Nourredine

• Biodiversity Journal, 11 (4): 1037-1044

  Arbaoui Mohamed, Yahia Noredine & Ghelamallah Amine
  Influence of salinity soil on the sodium, potassium and calcium content of tomato Lycopersicum esculentum Mill. (Solanales Solanaceae) at 5-leaf stage
  https://doi.org/10.31396/Biodiv.Jour.2020.11.4.1037.1044

  ABSTRACT
  The effect of salinity (NaClCaCl₂) on the evolution of mineral ions (Na⁺, K⁺ and Ca⁺⁺) and the variation of (Na⁺/K⁺ and Na⁺/Ca⁺⁺ ratios) in the roots of a Rio grande (Rg) tomato variety (Lycopersicon esculentum Mill., Solanales Solanaceae) at the 5-leaf stage was investigated. After germination of the seeds, the seedlings obtained are transferred to their environment to receive the nutritive solution. At 5 leaf stage, salt stress was applied with four concentrations (0, 100, 200 and 300 meq L-1 NaClCaCl₂) for 15 days. The results shows that salt stress increased Na⁺ and decreased K⁺ content significantly in both cultivars. Increase of salinity resulted in an increase of ions Na⁺ and Ca⁺⁺ in the tomato root cultivated on the two substrates but a decrease of K⁺. The Na⁺/K⁺ and Na⁺/Ca⁺⁺ ratio in roots of both cultivars cultivated on the two substrates increased significantly when concentration of NaClCaCl₂ increased in the medium. The presence of calcium in the medium (irrigation solution and bentonite) favored an increase in the average amount of calcium ions in the roots of tomato grown in sand substrate mixed with bentonite compared to those cultivated in the sand substrate alone.

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• Biodiversity Journal, 11 (4): 0931-0937

  Tahri Miloud, Arbaoui Mohamed, Yahia Nourredine & Chadli Rabah
  Anatomical changes of roots and steams of Phaseolus vulgaris L. (Fabales Fabaceae) under salinity at juvenile state
  https://doi.org/10.31396/Biodiv.Jour.2020.11.4.931.937

  ABSTRACT
  In Algeria, the region of Mostaganem is known for its agricultural soils with a sandy tendency and abnormally loaded with soluble salts affecting the yields of crops. To assess the salt tolerance threshold of the bean culture Phaseolus vulgaris L. (Fabales Fabaceae) variety “coco rose” was grown in plastic pots filled with two types of substrate, sand and sand amended with 7% bentonite (calcium clay of mining origin). The test was carried out in a greenhouse with controlled climatic conditions (variant temperature between 23-25°C, humidity is around 75% and a photoperiod of 12 hours). At the 5-leaf stage, irrigation with saline was provided with four saline concentrations (0, 50, 100 and 200 meq), the control is irrigated with distilled water. Two weeks later, the microscopic observations were made with an Optica type microscope, the results show a variability of the effect of saline stress depending on the organ and the concentration of the saline treatment. The anatomical structure of the treated roots and stems has shown significant anomalies; thus, the changes are marked by the decrease in the size of the parenchymal cells, that of the diameter of the xylem vessels and the increase in their number, under the action saline concentration (NaClCaCl₂) and according to the type of culture substrate sand (S) and sand with bentonite (SB).

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