| Full text | |
| Author(s): |
Total Authors: 3
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| Affiliation: | [1] Sao Paulo State Univ UNESP, Ctr Res Trop Tubers & Starches CERAT, BR-18610307 Sao Paulo - Brazil
[2] Sao Paulo State Univ UNESP, Coll Agr Sci, Dept Crop Sci, BR-18610307 Sao Paulo - Brazil
Total Affiliations: 2
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| Document type: | Journal article |
| Source: | Scientia Horticulturae; v. 180, p. 190-198, DEC 17 2014. |
| Web of Science Citations: | 16 |
| Abstract | |
Information regarding the characteristics that affect P-uptake capacity may assist in the selection of more adapted potato (Solanum tuberosum L.) cultivars and more adequate fertilization management for each cultivar. This study evaluated the P-uptake capacity of potato cultivars (Agata, Asterix, Atlantic, Markies, and Mondial) grown under P-deficient (2 mg L-1) or P-sufficient (31 mg L-1) conditions in nutrient solution and related it to physiological parameters of uptake and morphological root characteristics. When the plants were 24 days old, they were subjected to a P-uptake kinetics study. The length and surface area of roots and the uptake kinetic parameters (I-max, K-m, and C-min) varied among potato cultivars. Phosphorus-deficient potato plants had an approximately 60% smaller root surface area and an increase of 86% in the I-max and net P influx compared with the plants in P-sufficient conditions. However, these modifications in P uptake kinetics can do not influence P acquisition in the soil environment due to very limited P diffusion. The amount of P accumulated by plants grown under P-deficient conditions was directly related to the root length and surface area; a greater root surface, as demonstrated by the Asterix cultivar, is the most important factor for achieving a greater P-uptake capacity. Under P-sufficient conditions, potato cultivars such as Markies and Mondial showed a balance between morphological root characteristics (medium/large length and surface area) and physiological parameters (medium/high I-max values and net P influx) and had a greater P-uptake capacity. However, under field conditions, the responses to P deficiency may be different due to the very limited diffusion of P in the soil and because plants can use additional mechanisms to improve their P uptake from the soil. (C) 2014 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 10/04987-6 - Phosphorus fertilization in potato cultivars (Solanum tuberosum L.) |
| Grantee: | Adalton Mazetti Fernandes |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 10/18600-6 - Phosphorus absortion and use by potato cultivars (Solanum tuberosum L.) |
| Grantee: | Jaqueline Regiani Gonsales |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |