Electron microscopy of the filiform seedling axis of Cuscuta pedicellata

The filiform seedling stem of Cuscuta pedicellata was investigated by electron microscopy at three locations: the green apical part, the middle part, and the caudate part. The epidermis is covered by a thin hydrophobic cuticle. The outer cellulose wall is divided in two by a pectic layer. Chloroplas...

Full description

Saved in:
Bibliographic Details
Published in:Botanical gazette (Chicago, Ill.) Ill.), 1989-09, Vol.150 (3), p.230-238
Main Author: Lyshede, O.B. (Danish State Seed Testing Station, Lyngby, Denmark)
Format: Article
Language:English
Subjects:
ANATOMIA DE LA PLANTA
ANATOMIE VEGETALE
Biological and medical sciences
Cell walls
CUSCUTA
Cytoplasm
Epidermal cells
Extracellular space
Fundamental and applied biological sciences. Psychology
Lipid bodies
Morphology, anatomy, histology, cytology
Parasitic plants
Parasitic plants. Weeds
Phytopathology. Animal pests. Plant and forest protection
PLANT ANATOMY
Plant cells
Plant cytology, morphology, systematics, chorology and evolution
PLANTULAS
PLANTULE
Plastids
SEEDLINGS
Sieve elements
Spermatophyta
STEMS
TALLO
TIGE
ULTRAESTRUCTURA
ULTRASTRUCTURE
Xylem
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The filiform seedling stem of Cuscuta pedicellata was investigated by electron microscopy at three locations: the green apical part, the middle part, and the caudate part. The epidermis is covered by a thin hydrophobic cuticle. The outer cellulose wall is divided in two by a pectic layer. Chloroplasts in apical epidermal and cortical cells contain few thylakoids. In the caudate part the cell contents are lost prior to wilting and simultaneously the endodermis develops wall protuberances. In the cortex large intercellular spaces develop early, some of which contain cytoplasmic remnants. The stele is narrow and is composed of three groups of phloem, several cytologically different parenchyma cells, and, usually, one inconspicuous central xylem element with annular wall thickenings. The walls of this element disintegrate after it matures. Based on seedling structure and development, I suggest that recycling of cellular content is an important feature of seedling growth and that water absorption takes place through the surface.
ISSN:0006-8071
1940-1205
DOI:10.1086/337767