Abstract
In this work, tolerance of five genotypes of white poplar (Populus alba L.) on five concentrations of sodium chloride (1 mM, 3 mM, 10 mM, 33mM and 100 mM) in rooting medium was examined, based on 20 parameters that included biomass, photosynthetic and biochemical parameters. Concentration of 100 mM NaCl was inhibitory for biomass accumulation, content of photosynthetic pigments, total flavonoids content, total phenolics, increment of radical scavenging ability against ABTS+and DPPH+radicals, the increment of sodium content, the decrement of potassium and magnesium content, and the increment of potassium/sodium ratio in shoots of examined white poplar genotypes. This and medium with 33 mM could be purposed for further research on salt tolerance in white poplar. It could be concluded that genotype L-80 is the most tolerant against salinity, and that examined parameters can be indicative for the selection of white poplar genotypes tolerant to salinity.
Highlights
Knowledge on the tolerance of plants to abiotic factors can considerably help in the selection of species, especially in the establishment of multiannual plantations considering that stressful abiotic factors cause damage and decrease the productivity of plants
Concentration of 100 mM NaCl was inhibitory for biomass accumulation, content of photosynthetic pigments, total flavonoids content, total phenolics, increment of radical scavenging ability against ABTS+and DPPH+radicals, the increment of sodium content, the decrement of potassium and magnesium content, and the increment of potassium/sodium ratio in shoots of examined white poplar genotypes
The interaction that describes the differences in the reaction of genotypes on the examined media achieved a statistically significant effect on the content of total phenolics and flavonoids, as well as on the content of sodium, potassium, magnesium, and the K/Na ratio. (Table 1)
Summary
Knowledge on the tolerance of plants to abiotic factors can considerably help in the selection of species, especially in the establishment of multiannual plantations considering that stressful abiotic factors cause damage and decrease the productivity of plants. Salinity in soils becomes a growing problem on our planet. According to data presented by Flowe rs (2004), around 6% of the total area of agricultural soils are saline. It is estimated that around 20% of irrigated soils were affected by salinization, which leads to considerable yield losses (Munns , 2002; F l owers , 2004). Sodium chloride (NaCl) presents a serious threat, especially along the roads in urban areas. Plants exposed to stress caused by NaCl have stagnated growth, limited branching and yield. Na+ion was especially harmful in large concentrations in leaf, because it interferes with metabolic processes in leaf, on photosynthesis in particular (Schmöc ke l and Jar vi s , 2017)
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