caa a22 4500 477039081 CHVBK 20180405111312.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00984901 doi (NATIONALLICENCE)springer-10.1007/BF00984901 Organogenetic capacity of leaves: The significance of marginal blastozones in angiosperms [Elektronische Daten] [Wolfgang Hagemann, Stefan Gleissberg] A new term — the "blastozone” — is proposed to designate regions of the shoot competent for organogenesis. It is argued that the notion of "marginal meristems” is based on the cell theory and thus may not be appropriate to elucidate the process of organ formation. For instance, with respect to the occurrence of initials and of an elevated cell division rate marginal meristems have been shown to be doubtful structures. Furthermore, organogenetic competent regions form only parts of the meristems of the shoot. The study of blastozones from an organismic perspective reveals primary morphogenetic events such as initiation, incorporation, and fusion processes. Loss of morphogenetic competence is associated with histogenetic events, e.g., trichome outgrowth, and indicates the onset of processes leading to maturation. The marginal blastozone of the leaf is then used up although meristem features continue to be expressed. A series of SEM studies in several genera exemplifies the proposed viewpoint, demonstrating some of the morphogenetic potentialities of angiosperm leaf marginal blastozones. Springer-Verlag, 1996 Angiosperms nationallicence Leaf development nationallicence organismal approach nationallicence blastozone nationallicence organogenetic competence nationallicence primary morphogenesis nationallicence marginal meristems nationallicence topography nationallicence eumeristem nationallicence cytohistological gradients nationallicence Hagemann Wolfgang Werderplatz 11a, D-69120, Heidelberg, Federal Republic of Germany aut Gleissberg Stefan Institut für Systematische Botanik, Universität Heidelberg, Im Neuenheimer Feld 345, D-69120, Heidelberg, Federal Republic of Germany aut Plant Systematics and Evolution Springer-Verlag 199/3-4(1996-09-01), 121-152 0378-2697 199:3-4<121 1996 199 606 https://doi.org/10.1007/BF00984901 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00984901 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hagemann Wolfgang Werderplatz 11a, D-69120, Heidelberg, Federal Republic of Germany aut NATIONALLICENCE 700 1- Gleissberg Stefan Institut für Systematische Botanik, Universität Heidelberg, Im Neuenheimer Feld 345, D-69120, Heidelberg, Federal Republic of Germany aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 199/3-4(1996-09-01), 121-152 0378-2697 199:3-4<121 1996 199 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer