Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Physiological correlations and bud dormancy in the apple tree (Malus domestica Borkh.). | 220s Ann. Sci. For. 1989 46 suppl. 22ŨS-222S Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Physiological correlations and bud dormancy in the apple tree Malus domestica Borkh. o. Bailly and . Mauget Laboratoire de Bioclimatologie INRA Domaine-de-Crouelle 63039 Clermont-Ferrand Cedex France Introduction During their autumn rest period terminal and axillary buds of apple trees exhibit different behaviours the terminal bud is always much more dormant than the axillary ones so that one can wonder whether the latter are not simply inhibited by physiological correlations Williams et al. 1979 Mauget and Rageau 1988 . To check this hypothesis the following experiment was carried out on apple trees cultivar Golden delicious. Long shoots were defoliated and or pruned in fall and early winter in order to release buds from all physiological inhibitive influences apex leaves . The subsequent dormancy of buds on control and treated shoots was studied from fall until budburst on the trees. tember until January or c simultaneously defoliated and pruned or pinched in September and October. Bud dormancy on control and treated shoots was studied with the method of isolated node cuttings. For each treatment about 10 shoots were collected at intervals of 15 days and were cut into 8 cm cuttings on which a single node was left. The cuttings were stood in water at a constant temperature of 20 C under long days of 16 h. The time needed for budburst of each bud was recorded by daily observation. The average state of dormancy of the population of sampled buds was quantified by the mean time of budburst MTB expressed in days this was the arithmetic mean of the time to budburst for each bud from a given population and at each date of collection. The higher the MTB the more dormant the buds. Distal median or basal buds could be studied separately. Results are expressed as the change of MTB during the vegetative rest period. This described the time course of dormancy. Results .
