PJB-2023-470
ANATOMICAL CHARACTERIZATION OF VEGETATIVE ORGANS OF ENDANGERED HALOPHYTE PLANT ODONTARRHAENA BORZAEANA (NYÁR.) D. A. GERMAN
Loreley Dana JIANU
Abstract
Odontarrhena borzaeana (formerly Alyssum borzaeanum) is an endemic and endangered halophyte Brassicaceae species growing on the sandy shores of the Black Sea. The aim of this research was to improve the knowledge of this species by assessing some anatomical features of its vegetative organs. Cross sections of root, stem and leaves were treated with specific stains and analyzed by microscopy.
Roots had a secondary structure with less developed suber and secondary cortex and bundle-like arrangement of the primary xylem towards the centre of the root (alternating with pith tissue). Stem had a primary structure, with differentiated cortex (the innermost 2-3 cell layers having a flattened shape), Flattened blocks of phloem were followed by xylem. Well-developed sclerenchymal layers were found both within and between vascular bundles, forming a continuous ring around the stem. Pith was parenchymatic and abundant.
Leaf blades were amphystomatic and equifacial, with few layers of spongy parenchyma in the middle and well-developed palisade parenchyma towards both sides. Typical collateral bundles were each surrounded by a sheath of parenchymatous cells. Both stem and leaves were covered with massive stellate trichomes (larger on leaves), similarly to the ones reported in several related species.
To Cite this article:
Download
