Titre : | (Seed orchards : flower induction) |
Auteurs : | G. Philippe ; CEMAGREF NOGENT SUR VERNISSON AGNO |
Type de document : | article/chapitre/communication |
Année de publication : | 1995 |
Format : | p. 139-145 |
Note générale : |
Sigle : CEMAGREF Sigle : AGNO Diffusion tous publics |
Langues: | = Anglais |
Catégories : | |
Mots-clés: | PICEA ABIES ; VERGER A GRAINES ; CLONE ; SEMIS ; FLORAISON ; HORMONE ; SUBSTANCE CROISSANCE VEGETALE ; TRAITEMENT CHIMIQUE ; FREQUENCE ; DOSAGE ; INDUCTION FLORALE |
Résumé : | GA 4/7 injected 1 week after flushing strongly increased 1994 male and female flowering in 2 experiments set up in a 17-year-old clonal seed orchard of Norway spruce. However, the same treatment proved to be ineffective in a 2 years olders seedling seed orchard. Experiment 1 showed that full efficiency could be obtained through injection of 60 mg GA 4/7 per graft since a higher dose (90mg) did not give additional gain. On the other hand, application of 30 mg/graft resulted in a lower seed cone production. In experiment 3, no significant difference was found between pure GA 4/7 + ethanol mixture (hardly available in large quantities) and 2 commercial products including GA 4/7 (Régulex and Promalin). However, on the average since 1991, Pormalin injection led to half the seed cone production than the 2 other products. This difference may be due to the cytokinin that goes to its making. Therefore, il pure hormones are not available, Regulex shoult be preferred to Promalin. In addition, study of flowering in different years indicates that GA 4/7 tend to stimulate flowering of the same grafts and tend to favour those which flower naturally. |
Source : | Northern conifers in fast growing conditions : a step towards an adequate wood supply for industry : second year progress report (Air contract n° CT 920143), MONCHAUX P. (coord.) |
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