Deciphering the genetic basis of wheat seminal root anatomy uncovers ancestral axial conductance alleles

Elisha Hendel, Harel Bacher, Adi Oksenberg, Harkamal Walia, Nimrod Schwartz, Zvi Peleg

Research output: Contribution to journalArticlepeer-review

Abstract

Root axial conductance, which describes the ability of water to move through the xylem, contributes to the rate of water uptake from the soil throughout the whole plant lifecycle. Under the rainfed wheat agro-system, grain-filling is typically occurring during declining water availability (i.e., terminal drought). Therefore, preserving soil water moisture during grain filling could serve as a key adaptive trait. We hypothesized that lower wheat root axial conductance can promote higher yields under terminal drought. A segregating population derived from a cross between durum wheat and its direct progenitor wild emmer wheat was used to underpin the genetic basis of seminal root architectural and functional traits. We detected 75 QTL associated with seminal roots morphological, anatomical and physiological traits, with several hotspots harbouring co-localized QTL. We further validated the axial conductance and central metaxylem QTL using wild introgression lines. Field-based characterization of genotypes with contrasting axial conductance suggested the contribution of low axial conductance as a mechanism for water conservation during grain filling and consequent increase in grain size and yield. Our findings underscore the potential of harnessing wild alleles to reshape the wheat root system architecture and associated hydraulic properties for greater adaptability under changing climate.

Original languageEnglish (US)
Pages (from-to)1921-1934
Number of pages14
JournalPlant Cell and Environment
Volume44
Issue number6
DOIs
StatePublished - Jun 2021

Keywords

  • axial conductance
  • QTL
  • root anatomy
  • root hair
  • wheat seminal roots
  • wild emmer wheat

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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