Plant and Soil

, Volume 130, Issue 1–2, pp 143–156 | Cite as

Why are young rice plants highly susceptible to iron deficiency?

  • S. Mori
  • Naoko Nishizawa
  • H. Hayashi
  • M. Chino
  • E. Yoshimura
  • J. Ishihara
Article

Abstract

The reason why young rice plant is highly susceptible to Fe-deficiency was clarified as follows: Among Gramineae plants rice secreted a very low amount of deoxy-MA as a phytosiderophore even under Fe-deficiency, and the secretion by rice ceased within 10 days under Fe-deficiency although barley secreted MAs during a period of more than one month. When iron depletion continued, the rice root tips become chimeric and epidermal cells became necrotic. The mitochondrial membrane systems in the cortex cells were also severely damaged. Iron starvation occurred even in the mitochondria, and energy charge in the root decreased. This reduced energy charge has firstly diminished the secretion activity of deoxy-MA from the roots, secondly reduced the activity of the transporter which absorb deoxy-MA-FeIII chelate and finally reduced the synthesis of deoxy-MA from metionine. Consequently, the depletion of FeII in the shoot was induced and severe chlorosis rapidly developed in the young rice plant under Fe-deficiency.

Key words

MAs mitochondria mugineic acid phloem sap phytosiderophore rice root root washing xylem sap 

Abbreviations

DCCD

dicyclohexylcarbodiimide

CCCP

carbonylcyanide-m-chlorophenylhydrazone

MA

mugineic acid

MAs

mugineic acid-family phytosiderophores, it contains deoxy-MA, MA, epihydroxy-MA, hydroxy-MA, avenic acid and distichonic acid

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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • S. Mori
    • 1
  • Naoko Nishizawa
    • 1
  • H. Hayashi
    • 1
  • M. Chino
    • 1
  • E. Yoshimura
    • 1
  • J. Ishihara
    • 1
  1. 1.Department of Agricultural ChemistryThe University of TokyoTokyoJapan

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