TAILIEUCHUNG - Báo cáo khoa học: "Some aspects of bud in young oak activity and branch formation"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Some aspects of bud in young oak activity and branch formation. | 217s Ann. Sci. For. 1989 46 suppl. 217S-219S Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Some aspects of bud activity and branch formation in young oak R. Harmer Forest Research Station Farnham Surrey GU10 4LH . Introduction This work forms part of a programme to improve the genetic quality of oaks planted commercially some of this project is based on the vegetative propagation of selected superior genotypes. For this selection programme to be successful it must be possible to predict future development of the trees. This is particularly important when considering selection at the juvenile seedling or sapling stage when plants are more readily propagated but of unknown potential. Epicormic branches poor stem form and the unfavourable ratio of crown and trunk biomass are important characters determining the quality of a crop. Favourable changes in these will have a marked effect on value. They are probably interrelated phenoma resulting from bud production bud activity and branch growth. Detailed data on these aspects of growth are few but this information is essential for the development of procedures for early testing. The following experiments investigated the effect of nitrogen nutrition and bud position on the formation of branches in Quercus petraea seedlings. Terminology Shoot extension in oak occurs by rapid growth from a preformed bud. The distribution of leaves and buds on the shoots produced in each flush is uneven. In this study axillary bud density was ca 1 bud 20 mm length for most of the shoot but increased to ca 1 bud 2 mm at the tip the dense terminal rosette of leaves and buds of each flush is termed the whorl and the remaining longer section of shoot the interwhorl stem Fig. 1 . Mineral Nutrition In spring 1986 dormant 1 yr old seedlings of o. petraea which had flushed twice but not branched were decapitated below the 1st whorl see Fig. 1 and planted into 15 cm pots of peat-sand-perlite. Plants were grown in an unheated .

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