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Registros recuperados: 8
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3D virtual plants to phenotype differences among genotypes: Taking into account plant-environment interactions to better understand genetic variability in leaf development response to light Inra
Chenu, K.; Lecoeur, J..
Incident light affects orgnaogenesis and morphogenesis processes involved in leaf development through the amount of radiation absorbed by the plant (Chenu et al., 2005). The genetic variability of these responses was investigated on Arabidopsis thaliana ecotypes (Col, Di-m, Ler, Ws) and mutants (se-1, rot3-1, ron2-2, p70S-KOR) displaying contrasted architectures and radiation use efficiencies (Fig. 1).Plants were grown under various levels of incident light, with a stable light quality. The local plantenvironmentinteractions were estimated for each genotype, from plant emergence to the end ofrosette expansion, using an architectural model (Barczi et al., 1997) coupled with a radiative model (Dauzat and Eroy, 1997). Leaf development was assessed in terms of...
Tipo: Conference Paper Palavras-chave: MAQUETTE 3D; INTERACTION GENOTYPE ENVIRONNEMENT ARABIDOPSIS; LEAF DEVELOPMENT; ABSORBED RADIATION; LIGHT INTENSITY; 3D VIRTUAL PLANT; GENOTYPIC VARIABILITY.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010d4a3b41e&uri=/notices/prodinra1/2010/08/
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Competition, traits and resource depletion in plant communities Inra
Violle, C.; Garnier, E.; Lecoeur, J.; Roumet, C.; Podeur, C.; Blanchard, A.; Navas, M.L..
Although of primary importance to explain plant community structure, general relationships between plant traits, resource depletion and competitive outcomes remain to be quantified across species. Here, we used a comparative approach to test whether instantaneous measurements of plant traits can capture both the amount of resources depleted under plant cover over time (competitive effect) and the way competitors perceived this resource depletion (competitive response). We performed a large competition experiment in which phytometers from a single grass species were transplanted within 18 different monocultures grown in a common-garden experiment, with a time-integrative quantification of light and water depletion over the phytometers' growing season....
Tipo: Journal Article Palavras-chave: COMPETITIVE RESPONSE; COMPETITIVE EFFECT; PHYTOMETER; PLANT FUNCTIONAL TRAIT; RESOURCE COMPETITION.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20101d0875c&uri=/notices/prodinra1/2010/08/
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Estimation of the amount of light intercepted by a plant in natural and artificial environments: Contribution of 3D virtual plants in sunflower and Arabidopsis thaliana Inra
Chenu, K.; Rey, H.; Dauzat, J.; Lecoeur, J..
Light interception is a major contributor to biomass accumulation of crops. Beer's law has beenextensively used to estimate the amount of light intercepted by a plant at canopy level. Thismethod, based on the use of the leaf area index (LAI), is designed for well-developed crops wherethe canopy is assumed to be a turbid medium (Jones, 1992). However this assumption is seldomverified and in most situations canopies are strongly heterogeneous, as for example in perennialcrops such as vineyards and orchards (e.g. Louarn et al., 2007) or in row crops during the firstdevelopmental stages or when leaf senescence occurs. We propose here to test a method based on3D modelling to quantify the local light environment of plants in different situations,...
Tipo: Conference Paper Palavras-chave: INTERCEPTION LUMINEUSE; MAQUETTE 3D; INTERACTION GENOTYPE ENVIRONNEMENT.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010eb516727&uri=/notices/prodinra1/2010/08/
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How relevant are instantaneous measurements for assessing resource depletion under plant cover? A test on light and soil water availability in 18 herbaceous communities Inra
Violle, C.; Lecoeur, J.; Navas, M.L..
1.Quantifying the amount of resources remaining under plant cover is essential forassessing plant–plant interactions or biological invasions. Although resource levelsfluctuate in time, their quantification is performed mainly by instantaneous measurements.We investigated how instantaneous measurements are related to the amount ofresources cumulated throughout one growing season, measuring parameters of bothlight and soil water depletion.2.During a growing season, we measured regularly light and soil water levels underthe cover of 18 plant species grown as monocultures in a common garden. The temporaldynamics of light and soil water depletion were assessed within each monocultureusing mechanistic modelling approaches.3.The total amounts of resources...
Tipo: Journal Article Palavras-chave: PLANTE HERBACEE; ESPECE MEDITERRANENNE; COMMUNAUTE VEGETALE COMPARATIVE APPROACH; LIGHT TRANSMISSION; MECHANISTIC MODELLING; SOIL WATER CONTENT; TEMPORAL DYNAMICS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008d84199c3&uri=/notices/prodinra1/2008/10/
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Influence of intra-shoot trophic competition on shoot development in two grapevine cultivars (Vitis vinifera) Inra
Pallas, B.; Louarn, G.; Christophe, A.; Lebon, E.; Lecoeur, J..
The effect of trophic competition between vegetative sources and reproductive sinks on grapevine (Vitis vinifera L.) shoot development was analyzed. Two international cultivars (Grenache N and Syrah) grown in pots, which were well watered, were studied. A large range of trophic competition levels was obtained by modifying the cluster loads per plant. An analytical breakdown of the branching system was used to analyze the effects of trophic competition. Phytomer production on the primary axis and the probability and timing of axillary budburst were not affected by trophic competition. However, the duration of development and leaf production rate for secondary axes were both significantly affected. The impact of trophic competition differed within the...
Tipo: Journal Article Palavras-chave: RAMIFICATION; COMPETITION TROPHIQUE; VARIABILITE PHENOTYPIQUE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20082610c46f&uri=/notices/prodinra1/2008/09/
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Les possibilités de sélection pour le rendement en grains du tournesol par l’étude de caractères morphologiques et architecturaux Inra
Vear, F.; Triboi, A.M.; Lecoeur, J.; Vincourt, P.; Debaeke, P..
In sunflower, the active leaf area during the grain filling period has been shown to be an important character, which can be used to predict seed yield. Total and residual leaf areas of inbred lines and their hybrids are significantly correlated, but there may be some interaction between parents. Strict sense heritability is moderate. The relation between residual leaf area and seed yield has been confirmed using simplified leaf measurements on recombinant inbred lines and estimation of leaf area index with a ceptometer on hybrids. Studies of use of residual leaf area as a character in breeding for seed yield showed that F2 or F3 plants with the smallest leaf areas can be discarded, but, according to genotype, those with medium or largest leaf area give...
Tipo: Journal Article Palavras-chave: FLOWERING; HYBRID; INBRED LINE; INHERITANCE; LEAF AREA; PREDICTION.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011fcd6f66f&uri=/notices/prodinra1/2011/06/
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Simulations of virtual plants reveal a role for SERRATE in the response of leaf development to light in Arabidopsis thaliana Inra
Chenu, K.; Franck, N.; Lecoeur, J..
#The SERRATE gene (SE) was shown to determine leaf organogenesis and morphogenesis patterning in Arabidopsis thaliana. The se-1 mutant was used here to investigate the role of SE in leaf development in response to incident light. Virtual plants were modelled to analyse the phenotypes induced by this mutation.# •Plants were grown under various levels of incident light. The amount of light absorbed by the plant was estimated by combining detailed characterizations of the radiative environment and virtual plant simulations.# •Four major changes in leaf development were induced by the se-1 mutation. Two constitutive leaf growth variables were modified, with a lower initial expansion rate and a higher duration of expansion. Two original responses to a reduced...
Tipo: Journal Article Palavras-chave: CROISSANCE FOLIAIRE; ENVIRONNEMENT LUMINEUX ABSORBED RADIATION; LEAF DEVELOPMENT; LIGHT INTENSITY; MORPHOGENESIS; ORGANOGENESIS; SERRATE; VIRTUAL PLANT.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200873b74e6d&uri=/notices/prodinra1/2008/09/
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With sub-optimum conditions the current representation of potential crop development patterns needs to be reconsidered Inra
Clouvel, P.; Lecoeur, J.; Gérardeaux, E.; Luquet, D.; Rey, H.; Martin, P..
Most current process-based crop models use "de Wit" representation, whereby different types of stress reduce a potential plant development pattern that solely depends on the variety, temperature and radiation. That approach was largely validated for conventional agriculture and the corresponding range of environmental conditions. The aim of our study was to test the robustness of that representation under early sub-optimum growth conditions. Investigations were carried out on cotton in southern France under controlled glasshouses and field conditions. We analysed the effects of light interception, water supply and planting density on the node appearance pattern of the plant's main stem. Early stress on seedlings and a variation in planting density induced...
Tipo: Journal Article Palavras-chave: PLASTOCHRONE; INTERCEPTION LUMINEUSE NODE INITIATION; NODE APPEARANCE RATE; LIGHT INTERCEPTION; WATER STRESS; PLANTING DENSITY; DE WIT REPRESENTATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200890050c35&uri=/notices/prodinra1/2008/09/
Registros recuperados: 8
Primeira ... 1 ... Última
 

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