Data/hora: 09/06/2024 06:33:50

Provedor de dados: | 39
País: | Brazil
Título: | Different physiological responses under drought stress result in different recovery abilities of two tropical woody evergreen species
Autores: | Frosi,Gabriella; Harand,Wolfgang; Oliveira,Marciel Teixeira de; Pereira,Silvia; Cabral,Simone Pereira; Montenegro,Abelardo Antônio de Assunção; Santos,Mauro Guida.
Data: | 2017-06-01
Ano: | 2017
Palavras-chave: | Chlorophyll fluorescence; Climate changes; Gas exchange; Semiarid; Water deficit.
Resumo: | ABSTRACT The effects of water deficit on physiological and biochemical variables of young plants of two tropical woody species, Pachira aquatica and Sterculia foetida, and their recovery abilities were measured. Leaf water potential, gas exchange and selected carbon metabolism components were measured in a greenhouse experiment with control, moderate and severe water deficit treatments. Under severe drought stress, gas exchange and chlorophyll fluorescence decreased in both species compared to their respective controls. After rehydration, P. aquatica and S. foetida showed a partial and full recovery of the measured variables, respectively. In addition, a decrease and an increase in photosynthetic pigments were observed for P. aquatica and S. foetida, respectively, compared to their controls. In conclusion, the two species showed differing responses regarding photosynthetic pigment content dynamics for tolerating water deficit. Individuals of P. aquatica in the severe water deficit treatment showed a decrease in pigments, which may have impaired the recovery of metabolism (gas exchange) after rehydration, while S. foetida experienced an increase, favoring a full recovery of gas exchange and biochemical metabolism after rehydration.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000200153
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/0102-33062016abb0375
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.31 n.2 2017
Fonte: | info:eu-repo/semantics/openAccess