Contribution of phosphorus (P-32) absorption and remobilization for citrus growth

Autor(es)

Bachiega Zambrosi, Fernando C. ^[1] ; Mattos, Jr., Dirceu ^[2] ; Boaretto, Rodrigo M. ^[2] ; Quaggio, Jose A. ^[1] ; Muraoka, Takashi ^[3] ; Syvertsen, James P. ^[4]

Afiliação do(s) autor(es)

^[1] Inst Agron Estado Sao Paulo, Ctr Solos & Recursos Ambientais, BR-13012970 Campinas, SP - Brazil

^[2] Inst Agron, Ctr Citricultura Sylvio Moreira, BR-13490970 Cordeiropolis, SP - Brazil

^[3] USP CENA, BR-13400970 Piracicaba, SP - Brazil

^[4] Citrus Res & Educ Ctr, UF IFAS, Lake Alfred, FL 33850 - USA

• Tipo de documento: Artigo Científico
• Fonte: PLANT AND SOIL; v. 355, n. 1-2, p. 353-362, JUN 2012.
• Citações Web of Science: 17

Resumo

Phosphorus (P) is a mobile nutrient in the plant so growth depends on its internal remobilization and a plant's ability to respond to its availability in the growing media. This study was conducted to evaluate the influence of P status and rootstocks on the patterns of P uptake and remobilization in orange trees. Sweet orange trees on Cleopatra mandarin (CM) or Rangpur lime (RL) rootstocks were grown for nine months in nutrient solution (NS) that was either P-deficient (DNS) or was P-sufficient (SNS). After this period, half of the trees were reciprocally transferred between DNS and SNS (from D to S and S to D), while the others remained in their initial P availability. Trees on RL had more shoot and root growth, accumulated more P and had greater efficiency of P absorption and transport to the shoot (PAE) than those on CM. The major source of P for growth was previously stored P even with an adequate current P supply to the roots. This suggested the dominance of P remobilization over P uptake and the requirement that trees had sufficient stored P to meet P demand of new growth. Trees on CM had greater concentrations of remobilized P in new shoots than trees on RL. Trees grafted on rootstocks less able to take up P (CM) were more dependent on the internal reserves of P for new growth than rootstocks with higher PAE (RL). (AU)

• Processo FAPESP: 07/04634-3 - Absorcao, eficiencia de uso de fracionamento do fosforo (32p) em plantas citricas.
• Beneficiário: Dirceu de Mattos Junior
• Modalidade de apoio: Auxílio à Pesquisa - Regular