Allocation, plasticity and allometry in plants

Weiner, Jacob

doi:10.1078/1433-8319-00083

Cited by 752 publications

(788 citation statements)

References 41 publications

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“…According to the optimal partitioning theory, plants respond to stressful environmental conditions by shifting carbon allocation to the organs collecting the most limiting resource, a form of plasticity conducive to growth maximization [5,11,42]. However adjustments in biomass allocation also occur as a natural consequence of growth and development (ontogenetic drift sensu Evans [12]), reflecting a shift in plant priorities along an ontogenetic trajectory [50]. In many cases, developmental stage and environment alter the functional relationship between traits [33].…”

Section: Introductionmentioning

confidence: 99%

Divergence among species and populations of Mediterranean pines in biomass allocation of seedlings grown under two watering regimes

2007

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-Seedlings of four populations each of Pinus pinaster, P. halepensis, P. canariensis and P. pinea were grown in controlled conditions to evaluate both inter-and intra-specific differences in response to watering. We submitted half of the plants to a moderate water stress and after 22 weeks, we recorded height, stem diameter and root, stem and leaves dry weight. Patterns and amounts of phenotypic changes, including changes in biomass allocation, were analysed. We found a scant response in P. canariensis, P. pinaster and P. halepensis presented high population divergence for phenotypic changes, and P. pinea showed marked allocational shifts and no population divergence. The phenotypic changes observed within species are interpreted as a plastic response. The variation encountered within P. halepensis and P. pinaster may be indicative of specialisation to either resource-rich or resource-poor habitats, being populations from favourable sites more plastic. P. pinea exhibited a very uniform plastic response, indicating generalist behaviour.phenotypic changes / early testing / pine / drought stress / ontogeny Résumé -Divergences parmi les espèces et populations de pins méditerranéens pour l'allocation de biomasse chez des semis poussant sous deux régimes d'alimentation hydrique. Des semis de quatre populations de Pinus pinaster, de P. halepensis, de P. canariensis, et de P. pinea ont été élevés en conditions contrôlées pour évaluer au niveau inter-et intra-spécifique les différences de réponse au régime d'alimentation hydrique. Nous avons soumis la moitié des plants à un stress hydrique modéré et après 22 semaines nous avons mesuré leur hauteur, le diamètre de la tige et des racines, le poids sec de la tige et des feuilles. Les modèles et l'importance des changements phénotypiques, incluant les variations d'allocation de biomasse ont été analysés. Nous avons trouvé une faible réponse pour P. canariensis ; P. pinaster et P. halepensis ont présenté une importante divergence des populations au plan des changements phénotypiques, et P. pinea a montré une modification sensible au plan de l'allocation de biomasse sans divergence de population. Les changements phénotypiques observés chez les espèces ont été interprétés comme une réponse en terme de plasticité. Les variations rencontrées chez P. halepensis et P. pinaster peuvent être l'indice d'une spécialisation pour des habitats riches ou pauvres en terme de ressources. P. pinea a présenté une plasticité uniforme de réponse, révélant un comportement généraliste. changements phénotypiques / test précoce / stress hydrique / ontogénie

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Section: Introductionmentioning

confidence: 99%

Divergence among species and populations of Mediterranean pines in biomass allocation of seedlings grown under two watering regimes

2007

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“…A destinação prioritária desses recursos depende da importância e da força relativa dos drenos, fato que determina os diferentes padrões de alocação que caracterizam as estratégias de crescimento e perenização das plantas (WEINER, 2004). O padrão de alocação é função do ambiente no qual as plantas estão submetidas, indicando que a partição de recursos é plástica e, em muitos casos, mais importante para a determinação do componente morfológico alvo de competição que os mecanismos fisiológicos associados (KUPPERS, 1994).…”

Section: Resultsunclassified

Características morfogênicas e estruturais de amendoim forrageiro (Arachis pintoi krapovickas & Gregory cv. Belmonte) submetido a intensidades de pastejo sob lotação contínua

Fialho¹

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“…O tamanho, assim como o padrão de ramificação apresentado por uma planta, refletem estratégias adaptativas desse organismo, sendo a competição um fator que induz a uma semelhança alométrica entre os indivíduos de uma mesma população (Weiner & Thomas 1992). Indivíduos de C. brasiliense amostrados no cerradão apresentaram altura total e do fuste maiores que aquelas observadas para árvores do cerrado s.s. (Tabela 1).…”

Section: Resultsunclassified

Alometria de Caryocar brasiliense (Caryocaraceae) em diferentes fisionomias do Parque Estadual da Serra de Caldas Novas, GO

Siqueira

2006

Biota Neotrop.

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The relationship between size and shape in trees is important for understanding adaptive differences of species. Variations in these characteristics reflect the environmental conditions they are exposed to, being a response to the particular stress experienced by these individuals. Within this context, the present study aimed to analyze the allometric relation of two populations of Caryocar brasiliense Camb, present in two different physiognomies (cerradão and cerrado stricto sensu) of the Parque Estadual da Serra de Caldas Novas (PESCAN), located in the State of Goiás. Within each researched environment 30 individuals of C. brasiliense with diameter larger or equal to 15 cm from 30 cm up ground were sampled. The diameter from 30 cm up ground (DAS 30 ), the breast height diameter (DAP), total height and shaft height was recorded to each individual. For the correct analysis of this data, different models of regression were set. We found that the relation DAP/ DAS between the two environments were distinct, revealing a variation in the shape of the stem between the two environments. In the cerrado s.s. the trees presented a more conic shape, whilst in the cerradão, a more cylindrical stem was observed. Trees of C. brasiliense in the cerradão presented larger total height and shaft height than those of the cerrado s.s. due to, among other reasons, the competition for light in the environment. The occurrence of taller individuals suggests a larger investment in the vertical growth as a way of escape from the adverse conditions of the environment. The fact that individuals of Caryocar brasiliense adjust themselves to distinct allometric models, within each environment, suggests that the ecological factors may have a restrictive role in the allometry of this species.

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Allocation, plasticity and allometry in plants

Cited by 752 publications

References 41 publications

Divergence among species and populations of Mediterranean pines in biomass allocation of seedlings grown under two watering regimes

Divergence among species and populations of Mediterranean pines in biomass allocation of seedlings grown under two watering regimes

Características morfogênicas e estruturais de amendoim forrageiro (Arachis pintoi krapovickas & Gregory cv. Belmonte) submetido a intensidades de pastejo sob lotação contínua

Alometria de Caryocar brasiliense (Caryocaraceae) em diferentes fisionomias do Parque Estadual da Serra de Caldas Novas, GO

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