Studies on the mineral nutrition of the rice plant: Factors which affect the uptake of phosphate ions by excised roots of the variety IAC-164

Authors

  • E. Malavolta USP; CENA
  • A.J.R. dos Santos USP; CENA
  • A.F. de França USP; CENA
  • J.C. Fachinello USP; CENA
  • M.P. Barbosa F° USP; CENA

DOI:

https://doi.org/10.1590/S0071-12761984000100018

Abstract

Within the range of 15 to 240 minutes it was found that absorption increased in a linear fashion.By varying the external concentration of H2PO-4 from 10-7M to 10-2 M a dual pattern uptake was observed: a high affinity macnamism with a Km= 6.17 x 10-6M and a second one with low affinity (Km= 1.64 x 10-2M) . Absorption was raised when the external concentration of Mg ions varied from 10-6 to 10-4When supplied in the range of 10-6 to 10-2M the chloride salis of K and Ca rediced the absorption, the effect being traced to the CI ion. Zincsulfate (10-8to 10-4M) had no effect on phosphate absorption.

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Published

1984-01-01

Issue

Vol. 41 No. 1 (1984)

Section

nao definida

How to Cite

Malavolta, E., Santos, A. dos, França, A. de, Fachinello, J., & Barbosa F°, M. (1984). Studies on the mineral nutrition of the rice plant: Factors which affect the uptake of phosphate ions by excised roots of the variety IAC-164 . Anais Da Escola Superior De Agricultura Luiz De Queiroz, 41(1), 307-332. https://doi.org/10.1590/S0071-12761984000100018