Evaluation of physiological markers for assessing drought tolerance and yield potential in bread wheat

Tauqeer Ahmad Yasir*, Allah Wasaya, Mubshar Hussain, Muhammad Ijaz, Muhammad Farooq, Omer Farooq, Ahmad Nawaz, Yin Gang Hu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Carbon isotope discrimination (Δ) has been recognized as a valuable phenotyping tool in wheat breeding. However, technical expertise and analysis cost restrict its large-scale use. We examined the associations of ash content (AC), minerals content (Ca, K, Mg, Fe and Mn) and leaf chlorophyll content (Chl) with grain Δ and grain yield (GY) to assess their potential as substitute to grain Δ. We evaluated 49 wheat genotypes under two water deficit regimes (W120 and W200) in a rain-out shelter. Leaf chlorophyll content (Chl) was strongly correlated with grain Δ and GY under moderate water deficit regime (W200). Significant and negative correlations (P < 0.01) of AC and potassium concentration (K) with grain Δ, and between AC and GY was observed under both water regimes, while manganese concentration (Mn) was negatively correlated with grain Δ under W120 regime only and magnesium concentration (Mg) correlated negatively under the W200 regime only. Grain Δ was correlated (P < 0.01) positively with photosynthesis rate (A), stomatal conductance (gs) and GY, while correlated negatively (P < 0.01) with intrinsic water use efficiency (iWUE) under both water regimes. Results confirm the role of grain Δ as an indirect selection criterion for drought tolerance under a wide range of drought conditions. Additionally, Chl is the most suitable trait to predict yield under moderate water deficit conditions. AC and K concentration in grain proved potentially useful and economical alternative criterion to grain Δ in the evaluation of differences in yield potential and drought tolerance in wheat under drought.

Original languageEnglish
Pages (from-to)1163-1174
Number of pages12
JournalPhysiology and Molecular Biology of Plants
Issue number5
Publication statusPublished - Sept 1 2019


  • Ash content
  • Carbon isotope discrimination
  • Leaf chlorophyll content
  • Mineral content
  • Photosynthesis
  • Physiological

ASJC Scopus subject areas

  • Physiology
  • Molecular Biology
  • Plant Science


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