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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Bachiega Zambrosi, Fernando C. [1] ; Mattos, Jr., Dirceu [2] ; Boaretto, Rodrigo M. [2] ; Quaggio, Jose A. [1] ; Muraoka, Takashi [3] ; Syvertsen, James P. [4]
Total Authors: 6
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: PLANT AND SOIL; v. 355, n. 1-2, p. 353-362, JUN 2012.
Web of Science Citations: 17
Abstract

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)