Data/hora: 01/06/2024 15:13:41

Provedor de dados: | 94
País: | Brazil
Título: | Gas exchange of the umbu tree under semi-arid conditions
Autores: | Lima Filho,José Moacir Pinheiro.
Data: | 2004-08-01
Ano: | 2004
Palavras-chave: | Spondias tuberosa; Stomatal conductance; Transpiration; Photosynthesis; CO2 internal concentration.
Resumo: | A study was carried out at Embrapa Semi-Árido, Petrolina-PE, Brazil, aiming to understand the gas exchange process of the umbu tree (Spondias tuberosa Arr. Cam.) in the dry and rainy seasons. Stomatal conductance, transpiration, photosynthesis and internal CO2 concentration were obtained with a portable infrared gas analyzer (IRGA). During the dry season the umbu tree showed a much lower stomatal conductance early in the morning, as soon as the vapor pressure deficit increased, apparently affecting CO2 assimilation more than transpiration. The highest values were detected around 6:00 am but decreased to the lowest points between 10:00 am and 2:00 pm. During the rainy season, however, stomatal conductance, transpiration and photosynthesis were significantly higher, reaching the highest values between 8:00 and 10:00 am and the lowest around 2:00 pm. It was also observed at 4:00 pm, mainly during the rainy season, an increase on these variables indicating that the umbu tree exhibits a two-picked daily course of gas exchange.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452004000200006
Editor: | Sociedade Brasileira de Fruticultura
Relação: | 10.1590/S0100-29452004000200006
Formato: | text/html
Fonte: | Revista Brasileira de Fruticultura  v.26 n.2 2004
Fonte: | info:eu-repo/semantics/openAccess