45 YEARS OF APPLE ROOTSTOCKS BREEDING IN POLAND

An apple rootstock breeding program was started at the Research Institute of Pomology in 1954. From crosses made that year, five clonal rootstocks P 1, P 2, P 14, P 16 and P 22 were released twenty years later.
In 1968 crosses aimed at developing additional apple rootstocks were resumed.
In the following ten years some 40 families of hybrids were produced, totalling over 25,000 seeds, from which 6420 seedlings were raised.
After preliminary screening some, 500 selections were retained, of which 60 clones were selected for stoolbed and orchard performance tests.
The rootstock P 60 was released in 1994 and six more clones in 1997. At present, nine additional clones are being tested in national trials, four of which originate from a mutation breeding program.

Eucarpia symposium on Fruit Breeding and Genetics

T. Jakubowski, S.W. Zagaja

Malus domestica, vegetative rootstocks, breeding and selection

https://doi.org/10.17660/ActaHortic.2000.538.131