Leaf gas exchange and water relations in two assai cultivars submitted to water-deficit

Autor: Patricia Cardoso Andrade Navegantes, Wagner Romulo Lima Lopes Filho, Flávio Henrique Santos Rodrigues, Gabriel Gustavo Tavares Nunes Monteiro, Rosane Patrícia Ferreira Chaves, Candido Ferreira Oliveira Neto, Roberto Lisboa Cunha, Hugo Alves Pinheiro
Jazyk: English<br />Spanish; Castilian<br />Portuguese
Rok vydání: 2024
Předmět:
Zdroj: Revista Brasileira de Fruticultura, Vol 46 (2024)
Druh dokumentu: article
ISSN: 1806-9967
0100-2945
DOI: 10.1590/0100-29452024716
Popis: Abstract: Assai (Euterpe oleracea Mart.) cultivars BRS-Pará (BRS-PA) and BRS-Pai d’Égua (BRS-PDE) were selected for cultivation in upland regions of the Amazon. Given these cultivars were developed from different progenitors, we postulated that they differ regarding water-deficit tolerance. To test this hypothesis, plants of both cultivars were evaluated under well-watered (control) and water-deficit conditions (pre-dawn leaf water potential of – 2.33 MPa). Relative to control, the water-deficit decreased net CO2 assimilation rate (A) and transpiration by 82% and 86% in both cultivars, while the stomatal conductance (gs) was reduced by 93% and 87% in stressed plants of BRS-PDE and BRS-PA. The water-deficit improved instantaneous water-use efficiency by 43% in both cultivars, while intrinsic water-use efficiency (A/gs) increased by 193% and 33% in BRS-PDE and BRS-PA. The water-deficit induced 44% increase in foliar proline and 27% decrease in soluble carbohydrates in both cultivars, while foliar sucrose decreased by 53% in BRS-PA and 16% in BRS-PDE in relation to control. The relative water content in stressed plants of both cultivars was decreased by 8.5% in relation to control. In conclusion, the more efficient stomatal opening control and higher A/gs in BRS-PDE indicate this cultivar better copes with drought than BRS-PA.
Databáze: Directory of Open Access Journals
Externí odkaz: