Data/hora: 07/06/2024 09:39:24

Provedor de dados: | 39
País: | Brazil
Título: | Increased atmospheric CO2 changes the photosynthetic responses of Acrocomia aculeata (Arecaceae) to drought
Autores: | Rosa,Bruno Luan; Souza,João Paulo; Pereira,Eduardo Gusmão.
Data: | 2019-09-01
Ano: | 2019
Palavras-chave: | Climate change; Photosynthesis; Palm; Water stress; Water use efficiency.
Resumo: | ABSTRACT Water availability is the main factor that explains current patterns of palm abundance. However, the interaction between water stress and increasing atmospheric CO2 concentrations caused by climatic change and its effects on palm physiology remain poorly known. Macauba palm is a widespread Neotropical species commonly found in ecosystems subjected to seasonal drought and has potential use in oil production. The present work investigated the influence of increased CO2 concentrations on photosynthetic responses to drought in macauba palm plants. Exposure to increased CO2 concentrations led to up-regulation of photosynthesis through higher stomatal conductance and improved light and water use efficiency. Macauba palm plants under water stress, irrespective of CO2 concentration, were able to maintain constant levels of proline and chlorophyll, while preventing oxidative damage. Plants grown at higher CO2 concentrations were more capable of recovering from drought due to higher Rubisco carboxylation rate (Vc max) and electron transport rate (J max), which prevented a reduction in total dry mass at the end of the stress period. Stomatal control of photosynthesis, coupled with the prevention of severe damage under stress, would allow efficient biomass production by the macauba palm under future scenarios of climate change.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300486
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/0102-33062019abb0056
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.33 n.3 2019
Fonte: | info:eu-repo/semantics/openAccess