Root morphology and phosphorus uptake by potato cultivars grown under deficient and sufficient phosphorus supply

Autor(es)

Fernandes, Adalton M. ^[1] ; Soratto, Rogerio P. ^[2] ; Gonsales, Jaqueline R. ^[2]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Scientia Horticulturae; v. 180, p. 190-198, DEC 17 2014.
• Citações Web of Science: 16

Resumo

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)

• Processo FAPESP: 10/04987-6 - Adubação fosfatada em cultivares de batata (Solanum tuberosum L.)
• Beneficiário: Adalton Mazetti Fernandes
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/18600-6 - Absorção e utilização de fósforo por cultivares de batata (Solanum tuberosum L.)
• Beneficiário: Jaqueline Regiani Gonsales
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica