PRODUCING AND MULTIPLICATION OF PYRUS COMMUNIS HAPLOID PLANTS

The importance of haploids for the genetics and breeding techniques lies in reducing the time for the achievement of homozigous forms ( from 7–8 generations of self crosses for one gene, 8–9 generations for 5 genes and over 10 generations for more than 10 genes ) to one generation of crosses.
At the same time, the new homozigous forms are maintained from one to another generation by self cross-fertilization and their use in genetics selection it is necessary for having faster achievemnts in the desirable characters and features introduction by a stable gene transfer.

The studies done by Lespinasse Y, Godicheau M (1980 – 1983) on the apple sp.led to identification and multiplication by grafting and in vitro of a large number of haploids plants.

The previous studies with pear sp. (Darlington, Sax,etc) showed only the possibility, the ways and the importance of haploids in genetics and breeding of this species.

At the Fruit Research Institute Pitesti-Maracineni, Romania beginning with 1980 it has been studied the possibilities of producing pear haploids both by classical and androgenesis methods.

The present paper shows the technique or tracing by indirect and direct methods and multiplication by grafting and in vitro of a haploid plant of Pyrus communis.

Symposium on Production and Preservation of Pears

N. BRANISTE, A. POPESCU, T. COMAN

https://doi.org/10.17660/ActaHortic.1984.161.9