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- Title
ULTRASTRUCTURAL ASPECTS OF CELLULAR RESISTANCE TO POLLUTION. CASE STUDY - Phragmites australis (CAV.) TRIN. EX STEUD.
- Authors
CORNEANU, C. Gabriel; CORNEANU, Mihaela; CRĂCIUN, Constantin; TRIPON, Septimiu; LĂCĂTUȘU, Anca Rovena; COJOCARU, Luminița
- Abstract
Hiperaccumulator plants possess specific pathways for adaptation and growth in hostile environments, in the presence of large amounts of exogenous material, with harmful action. Reed (Phragmites australis (Cav.) Trin. ex Steud), a hyperaccumulator plant for cadmium, is also resistant to other heavy metals and radionuclides. It is a species widespread on Earth's surface with a great capacity to adapt to different environment conditions. After the analysis of the ultrastructural characteristics of three reed populations, developed in natural conditions, in different locations in the Middle Jiu Valley (Gorj, Romania), containing slightly different amounts of heavy metals and radionuclides, was established a possible resistance mechanism to heavy metals. Exogenous particles of different shapes, enter in the leaf through the stomata or penetrate the cuticle and the cell wall. In leaf tissue, the exogenous material is distributed through plasmodesmata to the neighbouring cells. Reed manifests a natural resistance to some stress factors achieved by: ferritin granules synthesis, as well as of chelating substances, with role in binding metal and in the transport of exogenous materials and active metabolic pathways, that allow a cell intense activity, even in the presence of exogenous material in the nucleus or mitochondria. In addition to this, all exogenous materials can be accumulated and stored in large vacuoles, located in some deposit cells, from the lacunar parenchyma, near the vascular system and stomata annex cells.
- Subjects
PHRAGMITES; CADMIUM content of plants; PLASMODESMATA; FERRITIN; PLANT parenchyma; VASCULAR system of plants
- Publication
Oltenia, Studii si Comunicari Seria Stiintele Naturii, 2018, Vol 34, Issue 2, p188
- ISSN
1454-6914
- Publication type
Article