| Texto completo | |
| Autor(es): |
Bulgarelli, Rafaela Gageti
;
de Oliveira Silva, Franklin Magnum
;
Bichara, Samir
;
Andrade, Sara Adrian L.
;
Mazzafera, Paulo
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PLANT AND SOIL; v. 445, n. 1-2, p. 20-pg., 2019-10-17. |
| Resumo | |
Background and aims Twenty-four species of eucalypts were studied regarding their ability to grow under low P and their responsiveness to P inputs. Methods Growth and photosynthesis-related parameters were evaluated. Results Growth of all species was influenced by low P availability. No significant correlation was found between leaf P concentration and biomass, indicating that P concentrations in leaves cannot be solely considered an indication of the responsiveness to P in eucalypts. Species responsive to P-input (high agronomic P efficiency values, APE) were those with low P use efficiency - PUE (here assessed as relative efficiency of P-use, REP) and low P uptake efficiency (PUpE). But, non-responsive species were related to higher P-efficiency under low soil P-availability. Eucalyptus tereticornis, E. cladocalyx, E. globulus and E. camaldulensis were efficient under low-P availability. Whereas, E. crebra and E acmenoides were the most responsive species, with high APE, suggesting that for these species P-inputs are needed to guarantee plant growth. The root:shoot ratio remained constant at different P availabilities, suggesting that biomass allocation towards the root in response to P and greater investment in roots were not correlated with greater PUE. Under limited P, E. robusta and E. botryoides exhibited low foliar P contents and higher root:shoot ratios than those of other species with higher P contents, indicating that greater root investment does not necessarily result in greater PUE. Conclusion The results suggest that the divergence among species is probably related to different mechanisms, which may improve P-use efficiency. (AU) | |
| Processo FAPESP: | 17/21738-9 - Resposta à disponibilidade de fósforo em plântulas de espécies de Eucalyptus: crescimento e características fotossintéticas das folhas |
| Beneficiário: | Samir Bichara |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |
| Processo FAPESP: | 18/09624-0 - Bioquímica da eficiência do uso de fósforo em eucalipto |
| Beneficiário: | Franklin Magnum de Oliveira Silva |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 16/25498-0 - Eficiência de uso de fósforo em Eucalyptus e os mecanismos fisiológicos e genéticos envolvidos |
| Beneficiário: | Paulo Mazzafera |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |