The article presents the results of studies to determine the compatibility of scion-rootstock combinations of apricot and peach at the stage of growing planting material in the nursery fields by using different methods. When growing planting material of apricot and peach in the field, three forms of incompatibility are determined to exist: localized disease, starvation of the root system, weak cohesion between the scion and rootstock. Initially during laboratory based testing the content of RNA and DNA was determined (using the “ArtRNA MiniSpin” reagent kit) as well as their ratio for 3 clonal rootstocks and 18 scion-rootstock combinations of apricot and peach, on the basis of which the compatibility coefficients were calculated, which made it possible to distinguish three groups: good compatibility (K = 0.01–0.17); medium compatibility (K = 0.18–0.20) and poor compatibility (K > 0.20), coinciding with groups according to the results of agrobiological evaluation in the field. Apricot varieties Znakhodka and Pamyat Loiko, incompatible with the stock VPK-1, were established.
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