Assessment of salt stress effect on wheat (Triticum aestivum L.) cultivars at seedling stage

Salinity is one of the major abiotic environmental stresses affecting plant crops. The present study was conducted at the regional lab of the National Seed and Plant Control and Certification Center (CNCC) of Sétif, Algeria. The purpose of this study was to assess the behavior of twenty bread wheat (Triticum aestivum L.) varieties under different salt stress concentrations (0, 50, 100 and 150 mM NaCl) at seedling stage under hydroponic conditions. Accordingly, the results indicated that NaCl induced significant decreases in roots length and number, coleoptile length, root and shoot fresh weights; and each variety reacted differently as indicated by the ‘genotype x salinity’ effect. Moderate (100 mM) and high (150 mM) salt stress were the most discriminating traits between sensitive and tolerant cultivars. Based on salt sensitivity index (SSI), the evaluated genotypes were grouped into three clusters. SSI identified Mezghana (V1), Almirante (V8), Sensas (V18), Florence Aurore (V19) and Pinzon (V20) as the most tolerant cultivars. These genotypes could be used in local wheat breeding programs for the improvement of salt tolerance

Assessment of salt stress effect on wheat (Triticum aestivum L.) cultivars at seedling stage

Salinity is one of the major abiotic environmental stresses affecting plant crops. The present study was conducted at the regional lab of the National Seed and Plant Control and Certification Center (CNCC) of Sétif, Algeria. The purpose of this study was to assess the behavior of twenty bread wheat (Triticum aestivum L.) varieties under different salt stress concentrations (0, 50, 100 and 150 mM NaCl) at seedling stage under hydroponic conditions. Accordingly, the results indicated that NaCl induced significant decreases in roots length and number, coleoptile length, root and shoot fresh weights; and each variety reacted differently as indicated by the ‘genotype x salinity’ effect. Moderate (100 mM) and high (150 mM) salt stress were the most discriminating traits between sensitive and tolerant cultivars. Based on salt sensitivity index (SSI), the evaluated genotypes were grouped into three clusters. SSI identified Mezghana (V1), Almirante (V8), Sensas (V18), Florence Aurore (V19) and Pinzon (V20) as the most tolerant cultivars. These genotypes could be used in local wheat breeding programs for the improvement of salt tolerance

Enhancement of the photoluminescence property of hybrid structures using single-walled carbon nanotubes/pyramidal porous silicon surface

This work presents additional physical results about the enhancement of the photoluminescence property of hybrid structures using single walled carbon nanotubes/pyramidal porous silicon surface, in comparison with what has already been published on these structures in terms of synthesis conditions and FTIR investigations as reported recently by the same authors in Journal of Alloys and Compounds 694 (2017) 1036 1044. Herein, the effect of the single walled carbon nanotubes (SWCNTs) layer on the optical properties of pyramidal Porous Silicon (pPSi) in hybrid SWCNTs/pPSi structure synthetized by chemical and electrochemical etching of silicon wafer was studied. Using both scanning electron mi croscopy (SEM), SWCNTs formed a thin film on pPSi surface and they are partly embedded in its pores. An analysis of Raman spectra for the realized structures confirmed the passivation of pPSi surface by SWCNTs film. The surface bond configurations were also monitored. Moreover, SWCNTs modified Pho toluminescence (PL) spectrum of pPSi by shifting PL peaks towards high energies, showed that the defect created in the materials can result in an efficient and stabilized photoluminescence response on Silicon (Si)