Báo cáo lâm nghiệp: experiment on the effect of girdling and gibberellin application on flowering induction of 12 yr old seedlings of Douglas fir and Norway spruce

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: experiment on the effect of girdling and gibberellin application on flowering induction of 12 yr old seedlings of Douglas fir and Norway spruce...
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Báo cáo lâm nghiệp: "experiment on the effect of girdling and gibberellin application on flowering induction of 12 yr old seedlings of Douglas fir and Norway spruce" experiment on the effect of girdling and gibberellinFieldapplication on flowering induction of 12 yr old seedlingsof Douglas fir and Norway spruceM. Bonnet-Masimbertwith the technical assistance of G. o Chanteloup, P. Delanzy and J. CoupayeINRA, Station damdlioration des Arbres Forestiers, Ardon, 45160 Olivet, France .. - I...-- - I..-...... I ..1 ! mm wide girdles) and trunk injections of gib-Introduction berellins (GA4/7) were tested in 1986 on 12 yr old seedlings, 6-8 m high, raised in the INRAClimate has a strong influence on flow- (Orl6ans) nursery.ering of trees and, for field experiments, itis difficult to control environmental condi- Douglas firtions. Thus, many experiments on flow- 50 seedlings, belonging 7 open-pollinated toering induction in conifers are performed divided among 4 treatments families, wereon potted trees, which are at least partly applied just before vegetative bud burst: 1)maintained under greenhouse conditions. control; 2) girdling; 3) girdling + 50 mg GA4/7The benefits of establishing indoor (45% A7) + 5 mg naphthalene acetic acid (NAA); 4) girdling + 100 mg GA4/7 + 10 mgorchards instead of classical soil-based NAA. At treatment time, each tree received soilones have been proposed. However, fertilization with 200 g of Ca(N0 GA4/7 . 2 ) 3hundreds of hectares of soil-based seed injections were made in 300 pl of ethanol in theorchards have been established and must xylem of the 1981 internode. On each tree, 4 branches on both the 1982 and 1984 whorlsbe managed for a more abundant and were selected for shoot measurement and coneregular flowering. Also, besides clonal counts. Two branches were plastic-bagged (inorchards (generally grafted), some seed- order to simulate a localized ’greenhouseling seed orchards have been established effect’) for 2 wk starting 3 wk after the beginningwhich, for an equivalent size, are less of the treatment.mature than grafts. This paper deals withpreliminary field experiments on Douglas Norway sprucefir (Pseudotsuga menziesii) and Norway open-pollinated 30 seedlings, belonging to 6spruce (Picea abies) seedlings. were divided families, among 5 treatments. applied when about 50% of Treatments were the lateral shoot elongation was completed and consisted of: 1) girdling; 2) girdling + 2 x 50 mgMaterials and Methods GA4/7 at a 2 wk interval in the 1983 internode; applied in the 1981 treatment 2 3) same as application of 100 internode; 4) girdling + oneTwo experiments using com ...