Data/hora: 17/06/2024 07:25:30

Biblioteca(s): | Embrapa Meio-Norte.
Data corrente: | 11/04/1997
Data da última atualização: | 16/01/2024
Autoria: | BERRYMAN, C. A.; EAMUS, D.; DUFF, G. A.
Título: | Stomatal responses to a range of variables in two tropical tree species grown with CO2 enrichment.
Ano de publicação: | 1994
Fonte/Imprenta: | Journal of Experimental Botany, v. 45 n. 274, p. 539-546, May., 1994.
Idioma: | Inglês
Conteúdo: | Seedings of Maranthes corymbosa (Blume) and Eucalyptus tetrodonta (F. Muell) were grown with or without CO2 enrichment (700 umo CO2 mol-1). The response of stomatal conductance (gi) to leaf drying, exogenous abscisic acid and calcium ions was investigated in M. corymbosa. Reciprocal transfer experiments were also conducted whereby plants were grown in one treatment and then transferred to the other before gs was measured. Stomatal conductance in M. corymbosa was more sensitive (a greater percentage decline in gs per unit percentage decline in leaf fresh weight) to leaf water status under conditions of CO2 enrichment compared to ambient conditions. However, the rate of reduction of gs in response to exogenous abscisic acid was not influenced by CO2 treatment. In contrast, the rate of reduction of gs in response to exogenous CaCl2 was decreased under conditions of CO2 enrichment. Reciprocal transfer experiments showed that exposure to CO2 enrichment results in a short-term, reversible decline in g, as a result of decreased stomatal aperture and a long-term, irreversible decline in g, as a result of a decreased stomatal density. Seedlings of E, tetrodonta were used to investigate the response of gs to light flux density, leaf-to-air vapour pressure difference (LAVPD), leaf internal CO2 concentration (Ci) and temperature. Reciprocal transfer experiments were also conducted. CO2 enrichment did not influence the pattern or sensitivity of response of gs to LAVPD and Ci in E. tetrodonta.
Palavras-Chave: | Arvore tropical; CO2; Elevated CO2; Maranthes corymbosa; Tropical trees.
Thesagro: | Estômato; Fisiologia Vegetal.
Thesaurus Nal: | Eucalyptus tetrodonta; stomata.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Meio-Norte (CPAMN)
Exemplares: | CPAMN - (1400-1) - ADC - AP - PP - S 10641 -  - 0010641 - DIS