Influence of Graft and Stock on the Stability of Grafted Pinus Sibirica Trees

Abstract

The growth characteristics of a 30-year-old Pinus sibirica grafted with cuttings from plus trees and a 36-year-old one of different geographical origin on the rootstock of Pinus sylvestris and Pinus sibirica, the results of their studying are presented in the article. The analysis of accretion of grafted components depending on the type, age of the rootstock was done. It has been established that 36-year-old grafted trees using cuttings of Pinus Sibirica of different geographical origin (Altai, Biryusa, Sverdlovsk, Khanty-Mansi) on the Pinus sylvestris tree differ in the growth of scion with rootstock. Ramets with good accretion (without exceeding the diameter of the stem of the scion over the stock) with maximum incompatibility (13.1 cm) were selected. The growth of 30-year-old grafted trees depends on the genotype of plus trees. The most intensive growth of ramet is noted at clone 91/55 in comparison with 100/64 and 94/58. The grafted trees of one clone (91/55) on the Pinus sylvestris had an average graft stem excess of 6.2 cm; there is practically no excess on the Pinus sibirica stock. It is recommended to use the selected specimens without sagging in the places of accretion of grafted components as uterine trees for their further reproduction and the creation of target plantations for the accelerated cultivation and use of industrial wood from Pinus sibirica.