Peter G^1,2, FA Funk³, A Loydi⁴, AI Casalini⁵, CV Leder⁴

Phyton-International Journal of Experimental Botany, Vol.81, pp. 233-237, 2012, DOI:10.32604/phyton.2012.81.233

Abstract In the western Monte Phytogeographical Province of Rio Negro, vegetation is a shrubby-grassland steppe, where plants are interspersed within a bare soil matrix forming “phytogenic islands”. The objective of this study was to evaluate the specific composition and cover of the study ecological system under different grazing pressures. We selected areas with high, moderate and low grazing intensity at three sites. In each area we established five linear transects, where basal cover and all intercepted species were registered. Sites were arranged through a Principal Component Analysis using the Infostat software. We analyzed similarity between sites, More >

Zhang YG, SX Guo, HY Dai

Phyton-International Journal of Experimental Botany, Vol.81, pp. 229-232, 2012, DOI:10.32604/phyton.2012.81.229

Abstract The length, dimension and type of the vessel elements in the secondary xylem of columnar and standard apple trees were studied by isolation method and micrograph. Results showed that the shoot xylem vessel cells were reticulate and pitted in columnar and standard apples. Most of the end walls were simple perforation plates. Compared with columnar apple trees, standard apple trees showed more abnormal cells in the xylem vessel cells. The average diameter of the xylem vessel cells of shoots was significantly wider in columnar apple (43.27μm) than in standard apple, (32.64 μm). Length of the More >

Guadarrama-Martínez N¹, M Rubí-Arriaga¹, A González-Huerta¹, LM Vázquez-García², I Martínez-De La Cruz¹, JA López-Sandoval¹, GV Hernández-Flores¹

Phyton-International Journal of Experimental Botany, Vol.81, pp. 221-228, 2012, DOI:10.32604/phyton.2012.81.221

Abstract The southeast region of the “Estado de México” is a transitional floristic zone. The municipalities which constitute are: “Tenancingo”, “Villa Guerrero”, “Malinalco”, “Zumpahuacán”, “Ixtapán de la Sal”, “Tonatico”, “Coatepec Harinas”, “Almoloya de Alquisiras” and “Texcaltitlan”. They present wood of Pinus, wood of Abies, wood of Quercus, mountainous mesophyll wood and deciduous rainforest as the main kind of vegetation. Our objective was to obtain a list of trees and bushes, which can have a potential ornamental use, in the southeast of that state. The botanical material was gathered with the conventional techniques during bimonthly trips to the studied… More >

Martín Montiel DC¹, SM Pérez de Bianchi¹, A Etcheverry¹, C Camardelli², M Alemán¹, T Figueroa¹

Phyton-International Journal of Experimental Botany, Vol.81, pp. 215-220, 2012, DOI:10.32604/phyton.2012.81.215

Abstract We studied the growth habit and root anatomy on two species of the Macroptilium genera, Fabaceae. These species, potential forages, are native to the Northwest Provinces in Argentina. The aims of this paper were to determine the survival capacity of the study species relating its growth habit and persistence with morphological and anatomical features. Root samples were collected and cut using either a microtome or by hand, at varying distances from the root tip. Cuts were examined under a light microscope, and with scanning electron microscopy (SEM) using staining techniques. Macroptilium bracteatum and M. erythroloma are perennial herbs. More >

Bhat RB

Phyton-International Journal of Experimental Botany, Vol.81, pp. 211-213, 2012, DOI:10.32604/phyton.2012.81.211

Abstract Types of leaf margin serration were investigated in ten species of the genus Hibiscus. Types and frequency of serration varied widely from species to species, from common to occasional to rare. Leaf serration is an important taxonomical feature in Hibiscus. More >

Cohen¹ G, L Mascarini¹, CC Xifreda²

Phyton-International Journal of Experimental Botany, Vol.81, pp. 199-204, 2012, DOI:10.32604/phyton.2012.81.199

Abstract Micromorphological and anatomical differences in leaf epidermis and stem xylem of Rosa hybrida ‘Lovely Red ‘ (LR) and ‘Rouge Baiser’ (RB), commercially grown in Buenos Aires, Argentina, were examined in the lower half of the terminal leaflet of 5-foliate leaves and in the basal part of stem, respectively. Digital images obtained from SEM and a phase contrast microscope were used with this purpose. Epicuticular wax, which was present on both sides of the leaves, was more abundant in LR than in RB. Stomata were only present on the abaxial side; they were 111 and 129 per… More >

Valdés Oyervides FJ¹, C Rivas Morales², A Benavides Mendoza¹, MA Núñez González², J Verde Star², A Oranday Cárdenas², V Robledo Torres²

Phyton-International Journal of Experimental Botany, Vol.81, pp. 191-198, 2012, DOI:10.32604/phyton.2012.81.191

Abstract Four dynamic conditions to evaluate the effects of stress on production of biomass, essential oils, Thymol, carvacrol and proline accumulation in Lippia graveolens H.B.K. were investigated under greenhouse conditions. A bifactorial design assessed four environmental conditions (factor B): commercial nutritive solution (B0); Water (B1); moderate stress (B2), and intermediate (B3) stress nested under (Factor A) salinity (NaCl) and ion concentration (Cu²⁺) and (Fe²⁺) stresses. Average production of fresh weight and number of leaves were reduced under NaCl and both ion concentration conditions. However, there were no significant differences on average for the four environments. The amounts of… More >

Redha A, P Suleman, R Al-Hasan, M Afzal

Phyton-International Journal of Experimental Botany, Vol.81, pp. 181-190, 2012, DOI:10.32604/phyton.2012.81.181

Abstract Cococarpus lancifolius Engl. grows wild in Djibouti, Somalia and East Africa, and South Asia. The species was introduced into Kuwait, where it is exposed to several stresses: oil pollution, salinity, high temperature and harsh climatic conditions. These conditions are prevalent in its semi-arid environment. In this study, the impact of salinity (2, 6 and 10%), temperature (20, 30 and 40 °C), polyethylene glycol (10, 30 and 60%) and drought has been investigated on C. lancifolius. Proline (Pro) accumulation (5.5 ± 0.03 µg/g dry weight; p≤0.05-0.005), protein (16.47 ± 0.052 mg/g; p≤0.001), free amino acids (10.92 ± 0.082… More >

He XY^1,2, H Ye¹, JL Ma^1,2, RQ Zhang², GC Chen¹, YY Xia¹

Phyton-International Journal of Experimental Botany, Vol.81, pp. 177-180, 2012, DOI:10.32604/phyton.2012.81.177

Abstract Annual leaf segments of eight Camellia species were used to study the heat tolerance by an electrical conductivity method, in combination with a Logistic equation to ascertain the semi-lethal high temperature by fitting the cell injury rate curve. The relationship between the processing temperature and the cell injury rate in Camellia showed a typical "S" shaped curve, following the Logistic model. The correlation coefficient was above 0.95. The semi-lethal high temperature LT₅₀ of the eight Camellia species, determined by the inflection point on the curve, varied from 50 to 57 LT₅₀ / °C, following the descending order: Camellia oleifera More >

Ruiz M¹ y O Terenti²

Phyton-International Journal of Experimental Botany, Vol.81, pp. 169-176, 2012, DOI:10.32604/phyton.2012.81.169

Abstract In Argentina cultivated grasses are the livelihood of the traditional livestock systems. Actually, the introduction of pastures in arid zones is one of the major challenges for ranchers. The aim of this work was to assess the germination of four forage species: Agropyron elongatum, Antephora pubescens, Cenchrus ciliaris cv Texas and Panicum coloratum cv Klein verde under water stress and salinity. Were used solutions of NaCl, KCl, Na₂SO₄, K₂SO₄ and Mannitol as inert solute, obtaining osmotic potentials (Ψo) of -0.5, -1, -1.5 -2.0, or -2.5 MPa. Seeds were cultivated in Petri dishes on germination paper, watered with 4… More >