Young Tomato Plants Respond Differently under Single or Combined Mild Nitrogen and Water Deficit: An Insight into Morphophysiological Responses and Primary Metabolism

• Tipo: Artigo em Revista Científica Internacional
• Data: 2023

Autores

Machado, J (Autor) Outra; Vasconcelos, MW (Autor) Outra; Soares, C (Autor) Outra; Fernanda Fidalgo (Autor) FCUP; Heuvelink, E (Autor) Outra; Carvalho, SMP (Autor) FCUP

Revista

Título: Plants

Vol. 12

Página Final: 1181

Editora: MDPI

Indexação

ISI Web of Knowledge - 5 Citações

Scopus

Outras Informações

ID Authenticus: P-00Y-1B7

DOI: 10.3390/plants12051181

Abstract (EN): This study aimed to understand the morphophysiological responses and primary metabolism of tomato seedlings subjected to mild levels of nitrogen and/or water deficit (50% N and/or 50% W). After 16 days of exposure, plants grown under the combined deficit showed similar behavior to the one found upon exposure to single N deficit. Both N deficit treatments resulted in a significantly lower dry weight, leaf area, chlorophyll content, and N accumulation but in a higher N use efficiency when compared to control (CTR) plants. Moreover, concerning plant metabolism, at the shoot level, these two treatments also responded in a similar way, inducing higher C/N ratio, nitrate reductase (NR) and glutamine synthetase (GS) activity, expression of RuBisCO encoding genes as well as a downregulation of GS2.1 and GS2.2 transcripts. Interestingly, plant metabolic responses at the root level did not follow the same pattern, with plants under combined deficit behaving similarly to W deficit plants, resulting in enhanced nitrate and proline concentrations, NR activity, and an upregulation of GS1 and NR genes than in CTR plants. Overall, our data suggest that the N remobilization and osmoregulation strategies play a relevant role in plant acclimation to these abiotic stresses and highlight the complexity of plant responses under a combined N+W deficit.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 21