BANDAS DE CASPARY PDF

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Anatomical structure of vegetative organs of Blutaparon vermiculare Amaranthaceae y Funastrum glaucum Apocynaceae , species growing in the Venezuelan coastal zones. Destaca en B. Blutaparon vermiculare and Funastrum glaucum grow in sandy soils with low nutrients availability and low water retention capacity, also influenced by salinity, high radiation and strong winds.

The aim of this study was the anatomical characterization of vegetative organs and distinguishing characters that could be linked to habitat conditions. Roots, stems and leaves were collected and they were processed following the standard methodology for mounts observable with an optical microscope. Funastrum glaucum has diarch roots; in their young stems is evident hypodermis, palisade parenchyma and the primary vascular tissue organized in a ring with a very narrow parenchimatic radio; in secondary structure, vascular cambium with unequal activity; the leaves are fleshy, anphystomatics and bifacials with papillose abaxial epidermis.

The features that ensure their survival were discussed, among they distinguish the following: developed protective tissues, presence of water reservoir, Kranz anatomy, variants in vascular cambium activity. Blake, Gomphrena albiflora Moq. Aizoaceae y G. Entre ellas se encuentran Blutaparon vermiculare L.

Mears Amaranthaceae y Funastrum glaucum Kunth Schltr. El periciclo se divide activamente Fig. Arrows indicate xylematics poles; druses inside circle. El tallo joven Fig. Arrows indicate stomata. La nervadura central es aplanada por la superficie adaxial y convexa por la abaxial; limitada por epidermis uniestratificada en ambas caras Fig. En el caso de F. Los tallos de ambas especies tienen reservorios de agua, B. Caracteres semejantes a los observados en B. A diferencia de lo encontrado por Coelho en B.

Por otra parte, B. Smithsonian Institution, Washington, DC. Flora Acta Biologica Cracoviensia Series Botanica Thesis Magister Scientiae. Pittieria Dickison W Integrative plant anatomy. Academic Press, San Diego.

Encyclopedia of plant anatomy. Gebruder, Borntraeger, Berlin. Acta Botanica Venezuelica Gibson A Anatomy of photosynthetic old stems of nonsucculent dicotyledons from North American deserts. Botanical Gazette Johansen D Plant microtechnique. McGraw Hill, New York. Organisms, Diversity and Evolution 2: Nilsen ET Stem photosynthesis: extent, patterns, and role in plant carbon economy. In : Gartner BL ed. Plant stems: physiology and functional morphology. Oecologia Parkhust DF The adaptative signifcance of stomatal occurrence on one or both surfaces of leaves.

Journal of Ecology Press MC The functional significance of leaf structure: a search for generalizations. New Phytologist Butterworth, London. Photosynthetica PLoS one 6: e Doi: Roth I Leaf structure: coastal vegetation and mangroves of Venezuela. American Journal of Botany Bioscence Plant, Cell and Environment The Plant List The plant list. Version 1. Access on 23 January Turner IM Sclerophylly: primarily protective?

Functional Ecology 8: Wahid A Physiological significance of morpho- anatomical features of halophytes with particular reference to Cholistan Flora. International Journal og Agriculture and Biology 5: Waisel Y Biology of halophytes. Academic Press, Nueva York. Services on Demand Journal.

Abstract Blutaparon vermiculare and Funastrum glaucum grow in sandy soils with low nutrients availability and low water retention capacity, also influenced by salinity, high radiation and strong winds.

Resultados Blutaparon vermiculare L. Funastrum glaucum Kunth Schltr. Recibido: 29 de Junio de ; Aprobado: 02 de Abril de Simone Teixeira. How to cite this article.

GEOTREKKING 1 PDF

Endodermis

In plant anatomy, the Casparian strip named after Robert Caspary is a band of cell wall material deposited in the radial and transverse walls of the endodermis , and is chemically different from the rest of the cell wall - the cell wall being made of lignin [1] and without suberin - whereas the Casparian strip is made of suberin and sometimes lignin [ clarification needed ]. The chemistry of the Casparian strip has been described as composed of suberin. According to some studies, [3] the Casparian strip begins as a localized deposition of phenolic and unsaturated fatty substances in the middle lamella between the radial walls, as partly oxidized films. The primary wall becomes encrusted with and later thickened by deposits of similar substances on the inside of that wall.

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