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Registros recuperados: 6
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Autumnal nitrogen nutrition affects the C and N storage and architecture of young peach trees Inra
Jordan, M.O.; Vercambre, G.; Le Bot, J.; Adamowicz, S.; Gomez, L.; Pagès, L..
Nitrogen fertilisation is a regular practice in orchards. Its effect on tree development, N and C acquisition and allocation were evaluated simultaneously, while coupling on the same trees in situ measurements of N uptake and shoot development and destructive determinations of organ composition in N and Total Non structural Carbohydrates (TNC). An hydroponic set-up was designed that could grow young peach trees at constant NO3 concentration while measuring N uptake. Forty-eight trees were raised outdoors under excessive N supply. Between October 2 and December 7, half of them were then N-limited to reduce N uptake by 75%. Organ N concentrations remained stable in the controls but were halved in N-limited trees. Growth (390 vs. 353 g DW tree−1) was less...
Tipo: Journal Article Palavras-chave: NITROGEN FERTILISATION; N UPTAKE; PLANT ARCHITECTURE; N ALLOCATION; NON STRUCTURAL CARBOHYDRATE.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201132df3892&uri=/notices/prodinra1/2011/06/
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GAI estimates of row crops from downward looking digital photos taken perpendicular to rows at 57.5° zenith angle: theoretical considerations based on 3D architecture models and application to wheat crops Inra
Baret, F.; de Solan, B.; Lopez Lozano, R.; Kai Ma; Weiss, M..
This study describes a technique to estimate green area index (GAI) of row crops from gap fraction measurements at 57.5° perpendicular to the row using downward looking digital photos. This particular directional configuration makes the gap fraction independent from leaf angle distribution and minimizes leaf clumping when plants overlap within the row and when rows overlap from this particular direction which is the case for several crops including wheat, maize, sorghum, sunflower and soybean. This was demonstrated from generic row crop canopy architecture models. Additional simulations over realistic 3D scenes of wheat crop allowed to calibrate the following equation relating the gap fraction (Po(57.5°)) to GAI for this particular directional...
Tipo: Journal Article Palavras-chave: MODELE TRIDIMENSIONNEL; PHOTOGRAPHIE NUMERIQUE; DISTANCE ZENITHALE LEAF AREA INDEX; GAP FRACTION; DIGITAL PHOTOGRAPHY; ROW CROPS; WHEAT; PLANT ARCHITECTURE; 3D MODEL.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201090fc8b2e&uri=/notices/prodinra1/2011/02/
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Integrating knowledge of tree biology and physiology into models of fruit tree development: a review Inra
Costes, E..
In the last decade, the consideration of fruit production as part of the entire tree development has become a new agronomic challenge, particularly with the emerging concept of the Integrated Fruit Production. This necessitates more consideration of the complexity of fruit tree biology with respect to perenniality and the year-on-year increase of tree structure. This has been made possible thanks to the development of methods used to describe and analyse entire tree structures. Over the same period, physiological processes have been investigated at a far more detailed level, thanks to progress made in cellular and molecular biology. These developments have prompted a new scientific question: how can knowledge acquired at the tree, organ, cellular or...
Tipo: Conference Paper Palavras-chave: INTERCEPTION LUMINEUSE; CYCLE DE LA PLANTE; ARBORESCENCE; RAMIFICATION STRUCTURE-FUNCTION MODELS; PLANT ARCHITECTURE; LIGHT INTERCEPTION; CARBON ALLOCATION; WATER FLUX; BIOMECHANICS.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008fa92adab&uri=/notices/prodinra1/2008/12/
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Shoot development and dieback in progenies of Nothofagus obliqua Inra
Puntieri, J.; Grosfled, J.; Stecconi, M.; Brion, C.; Azpilicueta, M.M.; Gallo, L.; Barthélémy, D..
Shoot growth and dieback were compared among progenies of nursery-grown seedlings of Nothofagus obliqua belonging to seven progenies of the same provenance (Quila-Quina, Argentina). First-year shoots consisted of one growth unit (GU) and second-year shoots of one or two GUs. The probability of development of two GU was similar for all progenies. Progenies were different in terms of shoot size, terminal bud abscission, the extent of shoot dieback after shoot extension and the node of origin of the relay shoot on the first shoot. Plants with a second-year shoot consisting of two GUs had a thicker stem and more nodes than those with single-GU shoots. The selection of N. obliqua seed trees based on architectural traits suitable for forestry development at...
Tipo: Journal Article Palavras-chave: DEPERISSEMENT DES POUSSES; UNITE DE CROISSANCE; DESCENDANCE; RAMIFICATION; FAUX HETRE; BOURGEON SHOOT DIEBACK; GROWTH UNIT; PROGENY; NOTHOFAGUS OBLICA; PLANT ARCHITECTURE.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007ce57b289&uri=/notices/prodinra1/2009/11/
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Sour cherry isolate of Plum pox virus (PPV-SoC): monitoring of viral distribution in infected Prunus rootstocks Inra
Bodin, M.; Verger, D.; Costes, E.; Glasa, M..
Six Prunus genotypes used as rootstocks, and including two interspecific hybrids, were chip-inoculated with the sour cherry isolate of Plum pox virus (PPV-SoC). The ability of the virus to infect different Prunus species was studied. The symptoms were noted and their location within the tree structure was determined by AMAPmod methodology. After a 3-year experimental period, 5 of the 6 Prunus genotypes tested (‘GF8.1’, ‘Jaspi’, ‘F12.1’, ‘Edabriz’ and ‘SL64’) were infected in vivo and showed different patterns of contamination. Generally, symptomatic leaves in all the infected genotypes were not consecutive on the shoots, thus resulting in a large symptomatic zone. The virus was characterised by irregular distribution in all the infected Prunus plants. The...
Tipo: Conference Paper Palavras-chave: PLUM POX VIRUS; CHERRY; IN VITRO GRAFTING; PLANT ARCHITECTURE; RESISTANCE.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20084d29886d&uri=/notices/prodinra1/2008/12/
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Virtual trees and light capture: a method for optimizing agroforestry stand design Inra
Leroy, C.; Sabatier, S.; Wahyuni, N. S.; Barczi, J.F.; Dauzat, J.; Laurans, M.; Auclair, D..
In agroforestry systems, the distribution of light transmitted under tree canopies can be a limiting factor for the development of intercrops. The light available for intercrops depends on the quantity of light intercepted by tree canopies and, consequently, on the architecture of the tree species present. The influence of tree architecture on light transmission was analysed using dynamic 3D architectural models. The architectural analysis of Acacia mangium and Tectona grandis was performed in Indonesian agroforestry systems with trees aged from 1 to 3 years. 3D virtual trees were then generated with the AmapSim simulation software and 3D virtual experiments in which tree age, planting density, planting pattern and pruning intensity varied were...
Tipo: Journal Article Palavras-chave: INTERCEPTION LUMINEUSE; MAQUETTE 3D; CANOPEE; EXPERIMENTATION VIRTUELLE ACACIA MANGIUM; TECTONA GRANDIS; LIGHT INTERCEPTION; PLANT ARCHITECTURE; 3D VIRTUAL PLANT; SIMULATION.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009106da4a6&uri=/notices/prodinra1/2010/09/
Registros recuperados: 6
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