Kinetics of growth, development and absorption of nutrients in stone pine (Pinus pinea L.) cultivated in the presence of NaCl

• Published in: Brazilian journal of biology 2024, Vol.84, p.1-11
• Main Authors: Ben Ammar, R., Metwally, A.M.A., Khaldi, A., Zid, E.
• Format: Article
• Language: English
• Subjects: Absorption; BIOLOGY; Controlled conditions; Economic analysis; flow of absorption; flow of transport; growth; Harvest; Ions; Irrigation; Kinetics; mineral nutrition; Nutrients; Nutrition; Pine; Pine trees; Pinus pinea; Pinus pinea L; Salinity; Salinity effects; Salt; Seedlings; Seeds; Sodium chloride; Stone; Substrates
• ISSN: 1519-6984; 1678-4375; 1678-4375
• DOI: 10.1590/1519-6984.263214

Abstract The aim of the present work was to evaluate and analyze the growth and mineral nutrition response of stone pine (Pinus pinea L.) seedlings, an economically important forest species. We analyzed the salinity effects on the kinetics of growth, development, and absorption of nutrients of plants cultivated under controlled conditions on a solid organic substrate. Pinus pinea plants were able to tolerate 25 mM NaCl concentration without reduced growth compared to the non-saline control. However, the salt concentration of 50 mM significantly affected the seedling growth after two weeks of treatment. Root growth activity was decreased more than the aerial parts at applied NaCl concentrations. On the other hand, seedlings restricted the transport of Na+ ions to the aerial parts and were strongly selective in favour of K+ ions. The presence of NaCl in the culture medium decreased the absorption rate and the export of K+ and Na+ ions to the aerial parts. This was reflected in the accumulation way of these two ions in the whole plant. Resumo O objetivo do presente trabalho foi avaliar e analisar a resposta de crescimento e nutrição mineral de mudas de pinheiro-manso (Pinus pinea L.), uma espécie florestal economicamente importante. Analisamos os efeitos da salinidade na cinética de crescimento, desenvolvimento e absorção de nutrientes de plantas cultivadas sob condições controladas em substrato orgânico sólido. As plantas de P. pinea foram capazes de tolerar a concentração de 25 mM de NaCl sem redução do crescimento em comparação com o controle não salino. No entanto, a concentração de sal de 50 mM afetou significativamente o crescimento das plântulas após duas semanas de tratamento. A atividade de crescimento das raízes foi mais reduzida do que as partes aéreas nas concentrações de NaCl aplicadas. Por outro lado, as plântulas restringiram o transporte de íons Na+ para a parte aérea e foram fortemente seletivas em favor dos íons K+. A presença de NaCl no meio de cultura diminuiu a taxa de absorção e a exportação de íons K+ e Na+ para as partes aéreas. Isso se refletiu na forma de acúmulo desses dois íons em toda a planta.