Visn. Hark. nac. agrar. univ., Ser. Biol., 2019, Issue 2 (47), pp. 82-91


https://doi.org/10.35550/vbio2019.02.082




INFLUENCE OF SEDAXANE ON GROWTH AND RESISTANCE OF SEEDLINGS OF SCOTCH PINE TO ROOT ROT DISEASE AND SOIL DROUGHT


Yu. V. Karpets, M. A. Shkliarevskyi

Dokuchaev Kharkiv National Agrarian University
(Kharkiv, Ukraine)


Sedaxane (mixture of trans- and cis-isomers of N-[2-(1,1'-bicyclopropyl)-2-ylphenyl]-3-(difluoromethyl)-1-methyl-1-H-pyrazole-4-carboxamide) is the synthetic compound with perfectly expressed fungicide properties. There are data not only about its contact action but also about the systemic effects due to the absorption by some organs of plants and transportation through conducting tissues to other organs. On the number of species of grassy cultivated plants it is established the positive effect of Sedaxane on their resistance not only to fungal diseases, but also to abiotic stressors. At the same time, the possible effects of Sedaxane on woody species (including coniferous) remain unexplored. In general the phenomenology of the physiological effects of Sedaxane on plants is also low-investigated. The effect of pre-sowing treatment of seed on the resistance of seedlings of Scotch pine (Pinus sylvestris L.) to root rot disease (on natural infectious background) and soil drought (decrease of relative humidity of soil to 25-30 % of full water capacity) was studied. The significant increase in the resistance to root rot disease was established at treatment of seeds with Sedaxane in the range of concentrations of 0,01-1 g/L. In the condition of 10-day drought, pre-sowing treatment of seeds with Sedaxane in the same range of concentrations positively influenced the indicators of linear growth of plants, raised the accumulation of fresh and dry masses by plants, increased the hydration and reduced the water deficit. The conclusion about the perspective of use of Sedaxane to the increase of resistance of seedlings of Scotch pine to biotic and abiotic stresses is made. Possible mechanisms of its stress-protective influence are discussed.


Key words: Pinus sylvestris, Sedaxane, root rot disease, drought, growth, resistance

 


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