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Effect of P 22 rootstocks propagated in vitro and traditionally on growth and fruiting of two apple cultivars

Alojzy Czynczyk*, Ewa Piskor**

**Research Institute of Pomology and Floriculture
**Waryńskiego 14, 96-100 Skierniewice, Poland
**Experimental Station
**Nowa Wieś near Grójec, Poland

The field performance of ‘Melrouge’ and ‘Gloster’ apple trees grafted on P 22 rootstocks propagated either traditionally in stoolbeds, in stoolbeds from in vitro-propagated mother plants, or by micropropagation was tested. The growth vigour of trees of the two cultivars grafted on rootstocks propagated either way was similar during the 6 years of experiment. The trees of cv. Gloster grafted on rootstocks propagated by all the methods bore fruits in the second year after planting, whereas ‘Melrouge’ trees grafted on in vitro-propagated rootstock started fruiting a year later than those grafted on rootstocks propagated traditionally. The cumulative yield during 6 years of experiment from trees of both cultivars grafted on micropropagated rootstocks was higher than that from trees grafted on rootstocks propagated traditionally. The trunk diameter at planting of traditionally propagated trees had no significant effect on their subsequent growth and fruiting. In the trees grafted directly on in vitro-propagated rootstocks the trunk diameter of maidens had no effect on their further growth but affected their fruiting - in Gloster cv. it had a positive effect on fruit yield whereas in Melrouge cv. the opposite was observed. The obtained results justify recommendation of micropropagated P 22 rootstocks for establishing commercial stoolbeds.

Czynczyk A., Piskor E., 2000. Effect of P 22 rootstocks propagated in vitro and traditionally on growth and fruiting of two apple cultivars. Folia Horticulturae 12/1: 29-39.