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- Title
Anatomical study on Lessonia nigrescens (Phaeophyceae, Laminariales) from Chile.
- Authors
Scrosati, Ricardo A.
- Abstract
The anatomy of young branches of Lessonia nigrescens Bory from central Chile was analyzed using light and transmission electron microscopy. Three regions are recognized: meristoderm, cortex, and medulla. The meristoderm is a few cell layers thick. Cortical cells have several primary pit fields with plasmodesmata 33-60 nm in diameter. Indirect evidence from pit field distribution suggests that symplasmic transport is mainly longitudinal in the inner cortex. The medulla contains hyphae, that originate from the inner cortical cells, and trumpet filaments. These cell systems do not communicate with each other. The hyphae have plasmodesmata in their cross walls, apparently in primary pit fields. The trumpet filaments have sieve areas in the transverse walls, with pores 70-170 nm in diameter. Occasionally, callose accumulates in some of these sieve areas. In general, cell walls are composed of microfibrils which are arranged in lamellae. The cell walls are surrounded by an intercellular matrix, which is more abundant in the medulla than in the meristoderm and the cortex.
- Subjects
PLANT species; CULTIVARS; TRANSMISSION electron microscopy; PLASMODESMATA; PLANT cells &; tissues
- Publication
Darwiniana, 1993, Vol 32, Issue 1-4, p271
- ISSN
0011-6793
- Publication type
Article