Planta

, Volume 235, Issue 6, pp 1409–1419 | Cite as

Natural variation for Fe-efficiency is associated with upregulation of Strategy I mechanisms and enhanced citrate and ethylene synthesis in Pisum sativum L.

  • Ahmad H. Kabir
  • Nicholas G. Paltridge
  • Amanda J. Able
  • Jeffrey G. Paull
  • James C. R. Stangoulis
Original Article

Abstract

Iron (Fe)-deficiency is a common abiotic stress in Pisum sativum L. grown in many parts of the world. The aim of the study was to investigate variation in tolerance to Fe deficiency in two pea genotypes, Santi (Fe-efficient) and Parafield (Fe-inefficient). Fe deficiency caused greater declines in chlorophyll score, leaf Fe concentration and root–shoot development in Parafield compared to Santi, suggesting greater Fe-efficiency in Santi. Fe chelate reductase activity and ethylene production were increased in the roots of Santi and to a lesser extent in Parafield under Fe deficiency, while proton extrusion was only occurred in Santi. Moreover, expression of the Fe chelate reductase gene, FRO1, and Fe transporter, RIT1 were upregulated in Fe-deficient roots of Santi. Expression of HA1 (proton extrusion) was also significantly higher in Santi when compared to Parafield grown in Fe-deficient conditions. Furthermore, the application of the ethylene biosynthesis inhibitor, 1-aminoisobutyric acid reduced the Fe chelate reductase activity, supporting a direct role for ethylene in its induction. A significant increase in root citrate was only observed in Santi under Fe deficiency indicating a role for citrate in the Fe-efficiency mechanism. Taken together, our physiological and molecular data indicate that genotypic variation in tolerance to Fe deficiency in Santi and Parafield plants is a result of variation in a number of Strategy I mechanisms and also suggest a direct role for ethylene in Fe reductase activity. The pea cultivar, Santi provides a new source of Fe-efficiency that can be exploited to breed more Fe-efficient peas.

Keywords

Field peas Fe deficiency tolerance Proton extrusion Fe chelate reductase Ethylene 

Supplementary material

425_2011_1583_MOESM1_ESM.doc (32 kb)
Supplementary material 1 (DOC 32 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Ahmad H. Kabir
    • 1
  • Nicholas G. Paltridge
    • 1
  • Amanda J. Able
    • 2
  • Jeffrey G. Paull
    • 2
  • James C. R. Stangoulis
    • 1
  1. 1.School of Biological SciencesFlinders UniversityBedford ParkAustralia
  2. 2.School of Agriculture, Food and WineThe University of AdelaideGlen OsmondAustralia

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