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Root traits and resource acquisition determining durum wheat performance under Mediterranean conditions: An integrative approach

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  • Rezzouk, Fatima Zahra
  • Gracia-Romero, Adrian
  • Segarra, Joel
  • Kefauver, Shawn C.
  • Aparicio, Nieves
  • Serret, Maria Dolors
  • Araus, José Luis

Abstract

Crop performance is very dependent on roots because they determine the capture of water and nutrients, and the crop’s subsequent growth and productivity. Durum wheat is a major crop in the Mediterranean region, where water and nitrogen availability limit its productivity. Therefore, the focus of this study was to uncover the response of root and shoot traits in durum wheat to different Mediterranean growing conditions and how they relate to better growth and yield performance. For this purpose, crop performance was evaluated in a set of modern durum wheat cultivars grown during four consecutive seasons and under contrasting water regimes, temperatures and nitrogen supplies, totalling 12 different growing conditions. Grain yield, biomass, other crop-growth traits (plant height, PH, and the Normalised Difference Vegetation Index, NDVI), together with physiological indicators of water (carbon isotope composition, δ13C, and canopy temperature depression, CTD) and nitrogen (nitrogen isotope composition, δ15N, and grain nitrogen yield, GNY) status were assessed. In addition, root architecture and distribution were measured using shovelomics and soil coring, and the provenance of the water captured by roots was determined by comparing the oxygen (δ18O) and hydrogen (δ2H) isotope compositions of water at the base of the stem, with water in different soil sections. Water and nitrogen status indicators combined with shovelomic traits allowed development of yield-prediction models. while higher yields were associated in most cases with better water status, root architecture was very responsive to different growing conditions. Overall, genotypes better adapted to rainfed conditions exhibited roots favouring deeper water extraction, whereas under support irrigation, the root system enabled water extraction from the topsoil as from deeper soil sections. Our study also highlights the limitation of shovelomics and soil coring as phenotyping approaches and proposes the δ18O of stem water as a promising functional phenotypic approach.

Suggested Citation

  • Rezzouk, Fatima Zahra & Gracia-Romero, Adrian & Segarra, Joel & Kefauver, Shawn C. & Aparicio, Nieves & Serret, Maria Dolors & Araus, José Luis, 2023. "Root traits and resource acquisition determining durum wheat performance under Mediterranean conditions: An integrative approach," Agricultural Water Management, Elsevier, vol. 288(C).
    • Handle: RePEc:eee:agiwat:v:288:y:2023:i:c:s0378377423003529
    DOI: 10.1016/j.agwat.2023.108487
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    1. Rezzouk, Fatima Zahra & Gracia-Romero, Adrian & Kefauver, Shawn C. & Nieto-Taladriz, Maria Teresa & Serret, Maria Dolores & Araus, José Luis, 2022. "Durum wheat ideotypes in Mediterranean environments differing in water and temperature conditions," Agricultural Water Management, Elsevier, vol. 259(C).
    2. Wang, Peng & Song, Xianfang & Han, Dongmei & Zhang, Yinghua & Liu, Xin, 2010. "A study of root water uptake of crops indicated by hydrogen and oxygen stable isotopes: A case in Shanxi Province, China," Agricultural Water Management, Elsevier, vol. 97(3), pages 475-482, March.
    3. Passioura, J. B., 1983. "Roots and drought resistance," Agricultural Water Management, Elsevier, vol. 7(1-3), pages 265-280, September.
    4. J. Haberle & P. Svoboda & I. Raimanová, 2008. "The effect of post-anthesis water supply on grain nitrogen concentration and grain nitrogen Šeld of winter wheat," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 54(7), pages 304-312.
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