Journal Article

Histological study of nodule morphogenesis from Cichorium intybus L. leaves cultivated in vitro

Pieron, S, Dekegel, D, Boxus, P

1998

Overview

Chicory root, stem, and leaf tissues have the propensity to regenerate organogenetic nodules following a wounding treatment. Using histological methods, we described this phenomenon on leaves of Cichorium intybus L. cv. 'Witloof' cultivated in vitro. Nodule morphogenesis and bud regeneration from nodules were characterized with the assistance of light and transmission microscopy techniques. Semithin and ultrathin sections of leaves and nodules were prepared from nodule induction to bud regeneration phases. Starch and inulin in differentiating tissues were histochemically detected in semithin and handmade sections. Our study demonstrates that nodules are formed in direct contact with vascular bundles of the leaves. The nodules consist of organized structures: a vascular center is surrounded by a large parenchyma, which is delimited by a periderm of multiple cork cell layers. Inside the vascular center near phloem tissues, a secretory network of articulated pseudolaticifers develops. From parenchymatous cells, in the vicinity of vascular centers, endogenous buds can be induced. In this region, several cords of vessel initials formed the vascular connection between neoformed buds and vascular centers. Simultaneously, transfer cell specialization occurs near the neoformed vascular strands. Vascular centers play a major role in this kind of organogenesis. Sugar metabolism appears to be closely related to nodule morphogenetic events.

• Publisher: Society for In Vitro Biology,Cambridge University Press
• Subject: ABIOTIC INJURIES / abiotic stress / Agronomy. Soil science and plant productions / ALMIDON / AMIDON / ANATOMIA DE LA PLANTA / ANATOMIE VEGETALE / APTITUD REGENERATIVA / APTITUDE A LA REGENERATION / Biological and medical sciences / BOURGEON / BUDS / Bundle sheath cells / CARBOHYDRATE METABOLISM / Cell Biology / CHEMISTRY / CHIMIE / CICHORIUM INTYBUS / CULTIVO DE TEJIDOS / CULTURE DE TISSU / Economic plant physiology / FAISCEAU VASCULAIRE / FEUILLE / FLOEMA / FORMATION DE NODOSITES / Fundamental and applied biological sciences. Psychology / Growth and development / HACES VASCULARES / HISTOCHEMISTRY / HISTOLOGY / HOJAS / INULIN / INULINA / INULINE / LEAVES / METABOLISME DES GLUCIDES / METABOLISMO DE CARBOHIDRATOS / MORFOGENESIS / MORPHOGENESE / MORPHOGENESIS / Morphogenesis, differentiation, rhizogenesis, tuberization. Senescence / NODULACION / Nodules / PARENCHYMA / PARENCHYME / PARENQUIMA / PERIDERM / PERIDERME / PERIDERMIS / PHLOEM / PHLOEME / PLANT ANATOMY / Plant cells / QUIMICA / Regeneration / REGENERATIVE ABILITY / ROOT NODULATION / STARCH / Starches / TISSUE CULTURE / VASCULAR BUNDLES / YEMA (PLANTA)