Root traits and δ13C and δ18O of durum wheat under different water regimes
Abdelhalim Elazab A , Gemma Molero A B , Maria Dolores Serret A and José Luis Araus A B C
+ Author Affiliations
- Author Affiliations
A Unitat de Fisiologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Av. Diagonal, 647, 08028 Barcelona, Spain.
B International Maize and Wheat Improvement Center (CIMMYT), El Batán, Texcoco, CP 56130, Mexico.
C Corresponding author. Email: jaraus@ub.edu
Functional Plant Biology 39(5) 379-393 https://doi.org/10.1071/FP11237
Submitted: 22 October 2011 Accepted: 13 March 2012 Published: 27 April 2012
Abstract
Plant growth, root characteristics and the stable carbon (δ13C) and oxygen (δ18O) composition were studied in durum wheat. Four recombinant inbred lines with good agronomic adaptation were grown under well watered (WW) and water stress (WS) conditions until mid-grain filling in lysimeters. Gas exchange was measured in the flag leaf just before harvest and then the aerial dry matter (Aerial DM), root weight density (RWD) and root length density (RLD) and the specific root length (SRL) were evaluated and the δ13C and δ18O of the roots, the flag leaf blade and the spike were analysed. Water stress decreased stomatal conductance, plant accumulated transpiration and Aerial DM, whereas δ13C and δ18O increased. Genotypic differences were found for all gas-exchange and root traits and isotope signatures. Aerial DM was positively correlated with RLD, regardless of the water regime, whereas it was negatively correlated with δ13C and δ18O, but only under WW conditions. Moreover, RWD and RLD were negatively related to both δ13C and δ18O under the WW regime, but no clear pattern existed under WS. Our study supports the use of δ13C and δ18O as proxies for selecting root traits associated with higher growth in the absence of water stress.
Additional keywords: leaf gas exchange, lysimeter, Triticum turgidum ssp. durum, root traits, δ13C, δ18O.
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