tailieunhanh - Báo cáo lâm nghiệp:" Mid-winter ultrastructural changes in the vegetative embryonic shoot of Norway spruce [Picea abies (L.) Karst.]"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:" Mid-winter ultrastructural changes in the vegetative embryonic shoot of Norway spruce [Picea abies (L.) Karst.]" | Ann. For. Sci. 60 2003 461-466 INRA EDP Sciences 2003 DOI forest 2003039 461 Note Mid-winter ultrastructural changes in the vegetative embryonic shoot of Norway spruce Picea abies L. Karst. Marzenna GUZICKAa Adam WOZNYb a Polish Academy of Sciences Institut of Dendrology ul. Parkowa 5 62-035 Kórnik Poland b Laboratory of General Botany Faculty of Biology Adam Mickiewicz University al. Niepodleglosci 14 61-713 Poznan Poland Received 18 September 2001 accepted 25 September 2002 Abstract - Ultrastructural changes in the winter embryonic shoot of Norway spruce are described. In January some cell elements did undergo considerable changes even within several days while morphological and anatomical changes were not observed. These ultrastructural changes were observed primarily within plastids starch accumulation and tannin vacuoles the disappearance of aldehyde groups . A glucose released from tannins seems to be utilized for starch synthesis at the time of breakage of winter dormancy. plastid starch tannin vacuole Résumé - Changements ultrastructuraux de la tige embryonnaire végétative de Picea abies en hiver. Les changements ultrastructuraux de la tige embryonnaire vegetative d epicea durant l hiver sont décrits. En janvier on n observe pas de changements morphologiques ni anatomiques. On observe par contre en l espace de quelques jours seulement des changements considerables au niveau cellulaire. Ceux-ci concernent avant tout les plastes accumulation d amidon et les vacuoles à tanins disparition des groupes aldehydes libres . Ces changements peuvent être provoqués par differents facteurs dont la temperature paraìt être le plus important. Le glucose libéré des tanins est probablement utilise dans la synthèse d amidon au moment de la sortie du repos hivernal. plaste amidon vacuole à tanins 1. INTRODUCTION Although there are several important monographs on spruce 2 17 our knowledge of many aspects of its development is still poor. Some information on the .