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  • Author or Editor: T. Hura x
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PEG-6000 induced osmotic stress caused differences in the relative water content (RWC), in the leaves of tested varieties of winter triticale. The highest values of RWC were observed for the Hortenso, Kazo and Gniewko varieties. The observed, low values of osmotic potential, allow one to conclude, that these varieties have adapted to stress conditions by maintaining the osmoregulation. Since osmotic tolerance is part of drought tolerance, the ability to maintain the osmotic regulation can be an important factor in the selection of varieties/genotypes resistant to the water deficit in the soil. The effectiveness of the photosynthetic apparatus was observed for above-mentioned varieties, with high values of RWC. The response test to the osmotic stress induced by the PEG solution, carried out under laboratory conditions, justified the decision to include Timbo in the group of drought resistant plants and as a standard physiological response to drought.

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5-Aminolevulinic acid relieves the effects of environmental stresses in plants. Therefore, the aim of our study was to evaluate the effects of 5-aminolevulinic acid (5-ALA) on the activity of the photosynthetic apparatus in spring wheat. Other analyzed parameters involved plant height, relative turgidity, membrane status, and chlorophyll level. The plant material consisted of three genotypes of spring wheat (J × Z, R × K, K × M), subjected to mild and severe drought in the early phase of vegetative development.

5-ALA showed a positive effect on the activity of the photosynthetic apparatus under water stress. The relieving action of 5-ALA on PSII was the most evident in J × Z genotype during severe soil drought. 5-ALA positively influenced the maximum photochemical efficiency of PSII (Fv/Fm), the overall performance index of PSII photochemistry (PI) and the effective quantum field of PSII (φEo). In the same genotype, the investigated acid stimulated light energy absorption (ABS/CSm), and enhanced the amount of excitation energy trapped in PSII reaction centers (TRo/CSm) and the amount of energy used for electron transport (ETo/CSm).

Moreover, 5-aminolevulinic acid showed its potential to overcome the adverse effects of water deficit on Triticum aestivum L. by increasing plant growth, relative turgidity, and chlorophyll content and reducing the degree of damage to cell membranes at the early phase of vegetative development.

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