TAILIEUCHUNG - Báo cáo khoa học: "Structure and development of vegetative buds, from the lower crown of Picea abies"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Structure and development of vegetative buds, from the lower crown of Picea abies". | Ann Sci For 1995 52 433-447 Elsevier INRA 433 Original article Structure and development of vegetative buds from the lower crown of Picea abies A Hejnowicz E Obarska Department of Genetics Institute of Dendrology Polish Academy of Sciences 62-035 Kórnik Poland Received 20 December 1993 accepted 8 March 1995 Summary Seasonal changes in the development of Norway spruce Picea abies L Karst vegetative buds in the lower crown position of 4 18-year-old free standing grafts in the climatic conditions of Poland are described. Bud awakening varies with the season while the end of shoot elongation after about 6 weeks seems to be weather independent. Mitotic activity of the embryonic shoot starts about 1 month before bud-burst. The new winter bud develops in 2 periods of bud scale primordia initiation autumn and spring and 1 period of needle primordia initiation during summer . The curves of apical dome size width and height have 2 peaks the 1st one in late April just before the 1st spring bud scale primordium emerges and the 2nd one during the time of rapid needle initiation mid-August . There is seasonal variation in starch accumulation. Starch is absent in the dormant bud. In the developing bud starch is associated with areas of high morphogenic activity. Picea abies I spruce vegetative bud anatomy I development Resume Structure et développement des bourgeons vegetatifs de la partie basse de la cou-ronne de Picea abies. L etude porte sur les changements au cours du temps et dans les conditions climatiques de la Pologne observes dans le développement de bourgeons vegetatifs situés dans la partie basse de la couronne d epiceas commons Picea abies L Karst . Elie concerne 4 arbres greffes âgés de 18 ans et poussant hors concurrence. La reprise de croissance des bourgeons varie seton les conditions saisonnières propres à chaque année alors que la fin d elongation des pousses environ 6 sem après le débourrement semble indépendante du climat. L activite mitotique de la jeune .

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