| Texto completo | |
| Autor(es): Mostrar menos - |
Debiasi, Tatiane V.
;
Calzavara, Anderson K.
;
Gomes, Diego G.
;
Andreas, Izabelle R.
;
Rondina, Artur B. L.
;
Duarte, Karoline E.
;
Pereira, Rodrigo M.
;
Batista, Bruno L.
;
Seabra, Amedea B.
;
Centeno, Danilo C.
;
Oliveira, Halley C.
Número total de Autores: 11
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| Tipo de documento: | Artigo Científico |
| Fonte: | ENVIRONMENTAL AND EXPERIMENTAL BOTANY; v. 228, p. 18-pg., 2024-10-29. |
| Resumo | |
Light intensity plays a crucial role in N uptake and assimilation in plants, but its interaction with different N sources is overlooked. Considering the high energy required for N assimilation, it is hypothesised that low light is critical for the seedling development with both N sources, but with increased light intensity, growing with nitrate (NO3- ) becomes favourable in relation to ammonium (NH4+). Seedlings of Cecropia pachystachya (pioneer), Guarea kunthiana (shade-tolerant, understory) and Cariniana estrellensis (shade-tolerant, canopy) were grown in hydroponic medium with NO3 -or NH4+ as the sole N source and subjected to low (LL) or high light (HL) for 60 days. All three species showed a decrease in growth when cultivated with NH4+, compared to NO3- , under HL, but not under LL. The decrease in biomass reached 54% in C. pachystachya, 36% in G. kunthiana and 26% in C. estrellensis. Growth reduction was associated with stomatal limitation of photosynthesis and reduced leaf area in C. pachystachya, and with non-stomatal limitation of photosynthesis and oxidative stress in G. kunthiana. Cation uptake was negatively affected by NH4+ in all species. Cariniana estrellensis showed no photosynthetic limitation and showed a higher tolerance to NH4+ under HL in terms of nutrient content. In conclusion, neither N source significantly favors seedling development under LL, while NH4+ is considerably more unfavorable for seedling development than NO3 -under HL. (AU) | |
| Processo FAPESP: | 19/15095-3 - Interação entre óxido nítrico e metabolismo de nitrogênio no desenvolvimento de raízes da espécie modelo Arabidopsis thaliana e de espécies arbóreas nativas do Brasil |
| Beneficiário: | Marília Gaspar Maïs |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 19/16226-4 - Superexpressão de genes relacionados a síntese de poliois em Setaria |
| Beneficiário: | Karoline Estefani Duarte |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 18/15576-9 - Metabolismo do carbono em plantas sob diferentes perspectivas: buscando alternativas para aumento de produtividade |
| Beneficiário: | Danilo da Cruz Centeno |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2 |