Light-curve responses in Atriplex nummularia L. irrigated with saline water

• Autor(a) principal: Lins,Cíntia Maria Teixeira
• Data de Publicação: 2022
• Outros Autores: Souza,Edivan Rodrigues de, Monteiro,Danilo Rodrigues, Paulino,Martha Katharinne Silva Souza, Melo,Hidelblandi Farias de, Dourado,Pablo Rugero Magalhães, Cunha,Jailson Cavalcante, Santos,Monaliza Alves dos, Schaffer,Bruce
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://scielo.pt/scielo.php?script=sci_arttext&pid=S0871-018X2022000200021
• topic: phytoremediation; gas exchanges; salt-affected soils; net photosynthesis

Abstract Atriplex nummularia L. is one of the most studied halophytes in research on phytoremediation of salt-affected soils. However, the optimization of biomass requires studies that indicate the appropriate way to evaluate the photosynthesis. The objective of this study was to investigate the photosynthetic efficiency of A. nummularia irrigated with saline water in order to indicate the best range of photosynthetically active radiation (PAR) that should be used. Plants were subjected to daily irrigations (0, 50, 100, 200, 250 and 300 mmol L-1 of NaCl). The light curves were determined at 15 and 84 days applying twenty light intensities (2000, 1750, 1500, 1250, 1000, 750, 500, 250, 200,175, 150, 125, 100, 75, 50, 25, 15, 10, 5, 0 μmol m-2 s-1 PAR). The highest values of photosynthesis rate were observed at PAR of 2000 μmol m-2 s-1 and of 800 μmol m-2 s-1 to 15 and 84 days of evaluation, independent of the NaCl concentration. The present study provides data that support the choice of the ideal PAR in evaluations of gas exchange in A. nummularia.