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Physiology of the Yield Under Drought: Lessons from Studies with Lupin

  • Jairo A. PaltaEmail author
  • Jens D. Berger
  • Helen Bramley
Chapter

Abstract

The ‘Old World’ lupin species are unique among grain legume crops in their strong specific adaption to acid sandy soils, and in their extremely recent domestication history. Our understanding of lupin responses to drought is limited; based on studies with elite cultivars, representing only a small fraction of the genetic diversity resident in the species, and subjected to strong selection for early phenology throughout their domesticated history, facilitating drought escape. Lupins appear to have a mix of competitive and conservative water use strategies, with profligate water use and high rates of photosynthesis when water is freely available; coupled with high sensitivity to water deficits, whereby stomatal conductance is reduced, phytohormone concentrations and metabolism modified, well before changes in leaf water potential occur. With high root-shoot ratios and high hydraulic conductance, lupin roots are highly efficient at taking up and transporting water. However, the predominantly apoplastic flow in lupins cannot be regulated as flexibly as the symplastic water transport that is so important in cereals. Low rates of remobilization of pre-anthesis stored C in lupin forces the crop to rely almost completely on current photosynthesis, which exacerbates the effects of terminal drought, given that the species respond by reducing leaf area through abscission. Because of the past narrow focus on domesticated material it is not currently possible to put these observations in an ecophysiological context, to answer which of these attributes are characteristic of lupins as a species, and which can be expected to vary in response to environmental selection pressure. To advance our understanding of the species we advocate the study of wild germplasm specifically-adapted to habitats that impose contrasting drought stress, to address both the narrowness and short evolutionary history of the domesticated material, by highlighting responses to millennia of natural selection. By identifying the pros and cons of adaptive traits in an ecophysiological context our capacity to improve elite material will be considerably advanced.

Keywords

Soil Water Content Stomatal Conductance Leaf Water Potential White Lupin Soil Water Deficit 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Jairo A. Palta
    • 1
    Email author
  • Jens D. Berger
    • 1
    • 2
  • Helen Bramley
    • 3
  1. 1.CSIRO, Plant IndustryWembleyAustralia
  2. 2.Faculty of Natural and Agricultural SciencesSchool of Plant Biology, The University of Western AustraliaCrawleyAustralia
  3. 3.The UWA Institute of Agriculture (M082)The University of Western AustraliaCrawleyAustralia

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