| Full text | |
| Author(s): |
Bulgarelli, Rafaela Gageti
;
de Oliveira Silva, Franklin Magnum
;
Bichara, Samir
;
Andrade, Sara Adrian L.
;
Mazzafera, Paulo
Total Authors: 5
|
| Document type: | Journal article |
| Source: | PLANT AND SOIL; v. 445, n. 1-2, p. 20-pg., 2019-10-17. |
| Abstract | |
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) | |
| FAPESP's process: | 17/21738-9 - Response to phosphorus availability in Eucalyptus species seedlings: growth and photosynthetic characteristics of the leaves |
| Grantee: | Samir Bichara |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 18/09624-0 - Biochemistry of phosphorus use efficiency in eucalyptus |
| Grantee: | Franklin Magnum de Oliveira Silva |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 16/25498-0 - Phosphorus use efficiency in Eucalyptus and the physiological and genetic mechanisms involved |
| Grantee: | Paulo Mazzafera |
| Support Opportunities: | Research Projects - Thematic Grants |