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Why are young rice plants highly susceptible to iron deficiency?

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Part of the Developments in Plant and Soil Sciences book series (DPSS,volume 43)

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 methionine. 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

  • M As
  • mitochondria
  • mugineic acid
  • phloem sap
  • phytosiderophore
  • rice root
  • root washing
  • xylem sap

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Abbreviations

DCCD:

dicyclohexylcarbodiimide

CCCP:

carbonylcyanide-m-chlorophenylhydrazone

MA:

mugineic acid

MAs:

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

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© 1991 Springer Science+Business Media Dordrecht

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Mori, S., Nishizawa, N., Hayashi, H., Chino, M., Yoshimura, E., Ishihara, J. (1991). Why are young rice plants highly susceptible to iron deficiency?. In: Chen, Y., Hadar, Y. (eds) Iron Nutrition and Interactions in Plants. Developments in Plant and Soil Sciences, vol 43. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3294-7_23

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  • DOI: https://doi.org/10.1007/978-94-011-3294-7_23

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-5455-3

  • Online ISBN: 978-94-011-3294-7

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