Data/hora: 16/06/2024 08:46:02

Provedor de dados: | 94
País: | Brazil
Título: | Water status and gas exchange of umbu plants (Spondias tuberosa Arr. Cam.) propagated by seeds and stem cuttings
Autores: | Lima Filho,José Moacir Pinheiro.
Data: | 2007-08-01
Ano: | 2007
Palavras-chave: | Water potential; Stomatal conductance; Transpiration; Photosynthesis; Root tubers.
Resumo: | The experiment was carried out at the Embrapa Semi-Árido, Petrolina-PE, Brazil, in order to study the physiological responses of umbu plants propagated by seeds and by stem cuttings under water stress conditions, based on leaf water potential and gas exchange measurements. Data were collected in one-year plants established in pots containing 30 kg of a sandy soil and submitted to twenty-day progressive soil water deficit. The evaluations were based on leaf water potential and gas exchange data collection using psychrometric chambers and a portable infra-red gas analyzer, respectively. Plants propagated by seeds maintained a significantly higher water potential, stomatal conductance, transpiration and photosynthesis under decreasing soil water availability. However, plants propagated by stem cuttings were unable to maintain a favorable internal water balance, reflecting negatively on stomatal conductance and leaf gas exchange. This fact is probably because umbu plants propagated by stem cuttings are not prone to formation of root tubers which are reservoirs for water and solutes. Thus, the establishing of umbu plants propagated by stem cuttings must be avoided in areas subjected to soil water deficit.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452007000200032
Editor: | Sociedade Brasileira de Fruticultura
Relação: | 10.1590/S0100-29452007000200032
Formato: | text/html
Fonte: | Revista Brasileira de Fruticultura  v.29 n.2 2007
Fonte: | info:eu-repo/semantics/openAccess