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MARÍA G. GARCÍA, CARLOS A. BUSSO, PABLO POLCI, NORBERTO L. GARCÍA GIROU, VIVIANA ECHENIQUE
BIOCELL, Vol.26, No.3, pp. 309-317, 2002, DOI:10.32604/biocell.2002.26.309
Abstract The effects of water stress on leaf water relations and growth are reported for three perennial tussock grass genotypes under glasshouse conditions. Studies were performed in genotypes El Palmar INTA and Selección Anguil of Agropyron scabrifolium (Döell) Parodi, and El Vizcachero of A. elongatum (Host) Beauv. Agropyron scabrifolium El Palmar INTA is native to a region with warm-temperate and humid climate without a dry season, and an average annual precipitation of 900 mm. Agropyron scabrifolium Selección Anguil comes from a region with a sub-humid, dry to semiarid climate and a mean annual precipitation of 600 mm. Agropyron elongatum is a… More >

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MARÍA CECILIA JUÁREZ¹, CARLOS BERNARDO PASSERA^1,2
BIOCELL, Vol.26, No.3, pp. 319-324, 2002, DOI:10.32604/biocell.2002.26.319
Abstract The genus Opuntia is a valuable forage resource in arid and semiarid lands during periods of drought and shortage of herbaceous plants. However, absolute minimum temperatures in the plains of Mendoza represent a limiting factor to cultivate several species.
Opuntia ellisiana is a cold hardy species, so the goals of this study were to massively propagate it using in vitro culture techniques, and then to acclimatize plantlets obtained to field conditions.
Different sterilization protocols were tested. Areoles were isolated in laminar airflow cabinet, and cultured on Murashige-Skoog medium, supplemented with sucrose and different BAP and IBA combinations. Explants were… More >

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MARIO ALDO RAVAGLIA , MARÍA CRISTINA MAGGESE
BIOCELL, Vol.26, No.3, pp. 325-337, 2002, DOI:10.32604/biocell.2002.26.325
Abstract Synbranchus marmoratus (Synbranchidae), commonly known as the swamp eel, is a protogynous diandric teleost fish widely distributed throughout South America. The purpose of this work was to study the ovarian anatomy and to describe oocyte developmental stages in the swamp eel, Synbranchus marmoratus.
S. marmoratus has a unique sacular ovary. It is covered by a conspicuous muscular wall, probably involved in an egg-releasing system acting as a peristaltic-like mechanism. The internal ovarian anatomy shows a Ushaped ovarian lamella delimiting a dorsal ovarian lumen. The microscopic study shows evidence of the existence of a germinal epithelium in the inner surface… More >

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M.A. MONTENEGRO^*, M. SÁNCHEZ NEGRETTE^*, E.J. GIMENO^**, J.T. BORDA^*
BIOCELL, Vol.26, No.3, pp. 339-345, 2002, DOI:10.32604/biocell.2002.26.339
Abstract Wistar male rats, 3 months of age were given ad-libitum a nutritionally adequate diet and demineralized drinking water. The Molybdenum (Mo) and Tungsten (W) were provided in the drinking water at 200 ppm concentration. Intestinal tumors were induced by 1,2-dimethylhydrazine (DMH) given subcutaneously as 16 weekly doses at 20 mg/kg body weight. Mo in the form of (NH₄)₆ Mo₇O₂₄ 4H₂O or W in the form of (Na₂ WO₄) were provided in the drinking water two months before the first DMH treatment and were continued during 4 months more until the last DMH treatment. Three months after the last carcinogen injection,… More >

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GLADYS N. HERMIDA, ALEJANDRO FARÍAS, LUISA E. FIORITO
BIOCELL, Vol.26, No.3, pp. 347-355, 2002, DOI:10.32604/biocell.2002.26.347
Abstract The lung of the toad, Melanophryniscus stelzneri stelzneri was studied using scanning and transmission electron microscopy. In M.s.stelzneri the parenchyma forms a polygonal network arrangement, therefore the parenchyma is edicular. These spaces are delimited by the interconnection of third order septa which are covered by respiratory epithelium. Small patches of ciliated epithelium without goblet cells appear irregularly distributed on the septa. The respiratory epithelium consists of one type of pneumocyte, which shows characteristics of both type I and type II alveolar cells of higher vertebrates. The pneumocytes are irregular in shape and possess attenuated cytoplasmic processes, which spread around the… More >

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ESSI KESKINEN¹ , YASUHARU TAKAKU² , V. BENNO MEYER-ROCHOW³, TAKAHIKO HARIYAMA⁴
BIOCELL, Vol.26, No.3, pp. 357-367, 2002, DOI:10.32604/biocell.2002.26.357
Abstract The aims of this paper have been (a) to characterize marginal ommatidia from different eye regions through a detailed description of their distinct ultrastructural features in three different size-classes of L. exotica, and (b) to compare microanatomical characteristics of the marginal ommatidia with those of ommatidia of the same eye, but located further centrally. On the basis of transverse as well as longitudinal sections we conclude that new ommatidia are added from a crescentic dorso-anterio-ventral edge of the eye and that maturing ommatidia go through a sequence in which originally the nuclei of cone -, pigment-, and retinula cells are… More >

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A. VIGLIOCCO^*, B. BONAMICO^*, S. ALEMANO^*, O. MIERSCH^**, G. ABDALA^*
BIOCELL, Vol.26, No.3, pp. 369-374, 2002, DOI:10.32604/biocell.2002.26.369
Abstract In the present paper we study the possible biological relevance of endogenous jasmonic acid (JA) and exogenous salicylic acid (SA) in a plant-microbial system maize-virus. The virus disease "Mal de Río Cuarto" is caused by the maize rough dwarf virus - Río Cuarto. The characteristic symptoms are the appearance of galls or "enations" in leaves, shortening of the stem internodes, poor radical system and general stunting. Changes in JA and protein pattern in maize control and infected plants of a virus-tolerant cultivar were investigated. Healthy and infected-leaf discs were collected for JA measurement at different post-infection times (20, 40, 60… More >

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