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Mathias Neumann Andersen

Screening for intrinsic water use efficiency in a potato dihaploid mapping population under progressive drought conditions

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  • Henrik Bak Topbjerg, Afgrødevidenskab, Denmark
  • Kacper Piotr Kaminski, Aalborg University, Denmark
  • Kirsten Kørup Sørensen
  • Kåre Lehmann Nielsen, Det Teknisk-Naturvidenskabelige Fakultet, Denmark
  • H G Kirk, Denmark
  • Mathias Neumann Andersen
  • Fulai Liu, Afgrødevidenskab, Denmark
A drought screening experiment focusing on intrinsic water use efficiency (WUEi) was carried out among 132 clones belonging to a dihaploid potato mapping population. The clones were exposed to progressive soil drying during a five-day period in a greenhouse pot experiment. Analysis of the underlying variables was done based on a multivariate data analysis strategy. The strategy successfully divided the clones into WUEi performance categories. Differences between clonal WUEi responses were traced back to differences in the net photosynthetic rate. Stomatal conductance (gs) did not vary significantly between the clones. Leaf abscisic acid (ABA) concentration and leaf water potential were found to reflect known isohydric behaviour for potato, and a non-linear relationship could be established for gs and leaf ABA concentration across the WUEi groups. Similarly, a common non-linear relationship between leaf ABA concentration and soil water potential was found. The latter findings suggest that the investigated population did not harbour significant genetic variation as to ABA production as function of soil desiccation level or with respect to the sensitivity of stomatal aperture vis-à-vis leaf ABA concentration and soil water potential.
Original languageEnglish
JournalActa Agriculturae Scandinavica, Section B - Soil & Plant Science
Volume65
Issue5
Pages (from-to)400-411
ISSN0906-4710
DOIs
Publication statusPublished - 2015

    Research areas

  • gas exchange, Intrinsic water use efficiency, mapping population, principal component analysis, Potato

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