Consulta: subjectFacets:"Xylem"
Registros recuperados: 5
Data/hora: 04/06/2024 06:40:16

Estimation of transpiration of the 'Valencia' orange young plant using thermal dissipation probe method
Provedor de dados: Engenharia Agrícola
Autores: Coelho,Rubens D.; Vellame,Lucas M.; Fraga Júnior,Eusímio F.
Most studies on measures of transpiration of plants, especially woody fruit, relies on methods of heat supply in the trunk. This study aimed to calibrate the Thermal Dissipation Probe Method (TDP) to estimate the transpiration, study the effects of natural thermal gradients and determine the relation between outside diameter and area of xylem in 'Valencia' orange young plants. TDP were installed in 40 orange plants of 15 months old, planted in boxes of 500 L, in a greenhouse. It was tested the correction of the natural thermal differences (DTN) for the estimation based on two unheated probes. The area of the conductive section was related to the outside diameter of the stem by means of polynomial regression. The equation for estimation of sap flow was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lysimetry; Sap flow; Xylem.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000300016

Embolism resistance as a key mechanism to understand adaptive plant strategies
Provedor de dados: Naturalis Digital Academic Repository
Autores: Lens, F.; Tixier, A.; Cochard, H.; Sperry, J.S.; Jansen, S.; Herbette, S.
One adaptation of plants to cope with drought or frost stress is to develop wood that is able to withstand the formation and distribution of air bubbles (emboli) in its water conducting xylem cells under negative pressure. The ultrastructure of interconduit pits strongly affects drought-induced embolism resistance, but also mechanical properties of the xylem are involved. The first experimental evidence for a lower embolism resistance in stems of herbaceous plants compared to stems of their secondarily woody descendants further supports this mechanical-functional trade-off. An integrative approach combining (ultra)structural observations of the xylem, safetyefficiency aspects of the hydraulic pipeline, and xylem–phloem interactions will shed more light on...
Tipo: Article / Letter to the editor
Palavras-chave: Embolism resistance; Adaptive plant strategies; Drought stress; Air bubbles (emboli); Xylem; 42.42.
Ano: 2013
URL: http://www.repository.naturalis.nl/record/453852

Boron affects the growth and ultrastructure of castor bean plants
Provedor de dados: Scientia Agricola
Autores: Silva,Denis Herisson da; Rossi,Monica Lanzoni; Boaretto,Antonio Enedi; Nogueira,Neusa de Lima; Muraoka,Takashi.
The cultivation of oleaginous plants like the castor bean guarantees employment for agricultural families and can contribute in energy and chemical sectors, especially in the northeastern semi-arid regions of Brazil. Boron (B) deficiency is a widespread nutritional disorder despite the fact that various anthropogenic sources with high B content may increase soil B to toxic levels for plants. The present study was designed to investigate the ultrastructural effects of boron deficiency and toxicity on castor bean plants which were grown under greenhouse condition using plastic containers with 10 L of nutrient solution. Boron treatments comprised: control (no B); 0.27 mg L-1, 5.40 mg L-1 B pots (one plant per pot), tested in a completely randomized design...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electron microscopy; Middle lamellae; Micronutrient; Xylem; Starch.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600014

Hydraulic architecture of lianas in a semiarid climate: efficiency or safety?
Provedor de dados: Acta Botanica Brasilica
Autores: Carvalho,Ellen Cristina Dantas; Martins,Fernando Roberto; Soares,Arlete Aparecida; Oliveira,Rafael Silva; Muniz,Celli Rodrigues; Araújo,Francisca Soares.
Xylem anatomical traits can provide insights regarding the mechanisms affecting the distribution of vascular plants across environmental gradients. In this study, we aimed to investigate the hypothesis that lianas occurring in semiarid environments have characteristics that maximize the xylem resistance to tension-induced cavitation along the root-stem-branch continuum. To gather information regarding the hydraulic architecture of the lianas, we analyzed several anatomical traits of wood: cross-sectional area occupied by the parenchyma (AP), fibers (AF), and vessels (AV); average vessel diameter (d); wood density (WD); pit diameter in the vessel wall (dpit); pit density (Npit), and potential hydraulic conductivity (Kp) in branches, stems, and roots of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potential hydraulic conductivity; Vessel diameter; Wood anatomy; Wood density; Xylem.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200198

Anatomical root variations in response to water deficit: wild and domesticated common bean (Phaseolus vulgaris L)
Provedor de dados: Biological Research
Autores: Peña-Valdivia,Cecilia B; Sánchez-Urdaneta,Adriana B; Meza Rangel,Joel; Juárez Muñoz,Juana; García-Nava,Rodolfo; Celis Velázquez,Raquel.
Root anatomical responses to water deficit are diverse and regulation of water uptake strongly depends on plant anatomy. The ancestors of common bean (Phaseolus vulgaris L.) cultivars are the wild common beans. Because wild beans adapt and survive well in theon atural environment, it is hypothesized that wild common bean roots are less affected than those of domesticated beans at low substrate water potential (&amp;#968;W). A wild common bean accession from Chihuahua Mexico and cv. Bayomex were studied. Seedlings with a mean root length between 3 and 4 cm were maintained for 24 h in vermiculite at &amp;#968;W of -0.03 (well hydrated), -0.65, -1.48 and -2.35 MPa (partially dry). Ten anatomical characteristics of differentiation and cell division in root...
Tipo: Journal article
Palavras-chave: Endodermis; Protoderm; Seedlings; Water potential; Xylem.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000400006