CONTRIBUTIONS REGARDING THE APPLE TREES GENETIC VARIABILITY INCREASE IN THE PROCESS OF OBTAINING IMPROVING BIOLOGICAL MATERIAL

The researches performed at the Fruit Growing Research and Development Station Voineúti in the period 2004?2012 point out the creation of some new apple trees selection bases from the biological material, obtained by sexuate hibridation. The genetic variability increase was remarked especially at the hybrid combinations, at which we used as genitors the recently created apple trees elites with genetic resistance against diseases, which included different resistance genes. The scab and mildew resistance feature was transmited to a greater percentage in the case of hybrid combinations between the resistant breeds - and in a more reduced percentage at the hybrid combinations: resistant breed x sensitive breed. The material undergoing selection and grafted in the nursery constitutes the base of the evaluation in test culture of the apple tree elites, regarding the features of productivity, fruits quality and genetic resistance against diseases.