Simulation of osmotic stress during the early stages of triticale development as a promising laboratory test for screening drought resistance
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.
Keywordstriticale drought photosynthetic apparatus RWC osmotic potential
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