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Correlation but no causation between leaf nitrogen and maximum assimilation: the role of drought and reproduction in gas exchange in an understory tropical plant Miconia ciliata (Melastomataceae). Repositório Alice
ARAGÃO, D. V.; FORTINI, L. B.; MULKEY, S. S.; ZARIN, D. J.; ARAUJO, M. M.; CARVALHO, C. J. R. de..
Alternative hypotheses were tested to explain a previously reported anomaly in the response of leaf photosynthetic capacity at light saturation (A..) in Miconia ciliata to dry-season irrigation. The anomaly is characterized by an abrupt increase in leaf A._ for nonirrigated plants at the onset of the rainy season to values that significantly exceeded corresponding measurements for plants that were irrigated during the previous dry season. Hypothesis I posits that a pulse in leaf nitrogen increases CO2 assimilation in nonirrigated plants at the onset of the wet season and is dampened for irrigated plants; this hypothesis was rejected because, although a wet-season nitrogen pulse did occur, it was identical for both irrigated and nonirrigated plants and was...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Amazon; Compensatory photosynthesis; Drought seasonality; Nitrogen content; Reprodutive phenology; Secondary forest.
Ano: 2005 URL: http://www.alice.cnptia.embrapa.br/handle/doc/578363
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Gas exchange and plant growth after defoliation on Leandra lacunosa, a cerrado woody species with continuous leaf production BABT
Damascos,Maria Angélica; Ronquim,Carlos Cesar; Prado,Carlos Henrique Britto Assis.
Morphological and physiological leaf traits were studied on control and defoliated potted Leandra lacunosa young plants. After defoliation, remaining bottom leaves showed no significant change in net photosynthesis and stomatal conductance values with time, but the leaf transpiration rate was higher. The production of the new leaves was greater after defoliation in top defoliated plants. Bottom defoliated plants increased stem extension rates and net photosynthesis transitorily. Two months after defoliation, control and defoliated plants did not differ in stem length and root dry mass values. In spite of smaller area and photosynthetic capacity, remaining bottom leaves were able to compensate top leaves elimination. The effectiveness of this compensatory...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compensatory photosynthesis; Herbivory; Leaf age; Leaf phenology; Leandra lacunosa.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000800013
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