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The paper presents the results of the researches carried out regarding the assessment of growing cells and tissues resistance. Actively growing cells and tissues have resistance ranges between 400-1300 kom, and the pre-cambium complex of stress-damaged or incompatible vaccine tissues in the nursery beyond 3300 kom. Field studies with a portable ohmmeter, (YX-360 TRD tester), with modified needle-type probes, allow a diagnostic assessment of the plants condition before the detection of visual signs of oppression from stress, or incompatibility in seedlings. The increase in ohmic resistance (impedance) to 4 kom is a signal of a decrease in adaptability and a disturbance in the metabolism of conducting structures. Large differences in the impedance readings in the grafting zone (budding) of the variety-rootstock combinations indicate to increased requirements for the plant care conditions in the nursery and for planting outside the nursery. Cuvinte cheie: impedanță, compatibilitate, adaptabilitate, varietăți de portaltoi, pepiniera, Republica Moldova.

IMPEDANCE OF THE PRE-CAMBIAL TISSUES AS AN INDICATOR OF ADAPTABILITY AND AFFINITY OF PLANTS IN THE FRUIT NURSERY