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The development of potential screens based on shoot calcium and iron concentrations for the evaluation of tolerance

Simon J Kerley1, Claus Norgaard, John E Leach

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Summary
This summary is machine-generated.

Egyptian lupin genotypes tolerate alkaline soils better than European ones by maintaining CO2 uptake and adjusting iron and calcium levels. This suggests potential for developing new, resilient lupin cultivars.

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Area of Science:

  • Agronomy
  • Plant Physiology
  • Soil Science

Background:

  • European white lupin (Lupinus albus L.) cultivars exhibit poor growth in limed/calcareous soils.
  • Egyptian lupin genotypes demonstrate successful growth and lack of stress symptoms in highly calcareous soils.

Purpose of the Study:

  • Investigate physiological responses of lupin to alkaline soil conditions.
  • Identify potential screening methods for alkaline soil tolerance in lupins.

Main Methods:

  • Three experiments were conducted in limed and non-limed soils.
  • Measurements included net CO2 uptake, and partitioning of Fe2+/Fe3+ and Ca in plant tissues.
  • Evaluated European cultivars, Egyptian genotypes, and Lupinus pilosus.

Main Results:

  • Intolerant European cultivars showed chlorosis and reduced CO2 uptake in limed soil.
  • Egyptian genotypes and L. pilosus maintained net CO2 uptake and exhibited less stress.
  • Egyptian genotype Giza 1 maintained stem Fe3+ and increased leaf Fe2+ in limed soil, unlike intolerant genotypes.

Conclusions:

  • Egyptian lupin genotypes possess physiological mechanisms for alkaline soil tolerance.
  • These mechanisms involve maintaining iron and calcium homeostasis.
  • Nutritional-based screening could identify tolerant lupin varieties for calcareous soils.