Gas exchange and plant growth after defoliation on Leandra lacunosa, a cerrado woody species with continuous leaf production

• Autor(a) principal: Damascos,Maria Angélica
• Data de Publicação: 2005
• Outros Autores: Ronquim,Carlos Cesar, Prado,Carlos Henrique Britto Assis
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Brazilian Archives of Biology and Technology
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000800013
• topic: Compensatory photosynthesis; herbivory; leaf age; leaf phenology; Leandra lacunosa

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 response, however, depended on the ability of new leaves to escape from herbivores.