Shoot δ15 N gives a better indication than ion concentration or Δ13 C of genotypic differences in the response of durum wheat to salinity

Functional Plant Biology : FPB
Salima YousfiJosé L Araus

Abstract

We compared the performance of different physiological traits that reveal genotypic variations in tolerance to salinity in durum wheat. A set of 114 genotypes was grown in hydroponics for over 3 months. Three conditions: control, moderate (12 dS m-1) and severe (17 dS m-1) salinity, were maintained for nearly 8 weeks before harvest. The genotype biomass in control conditions correlated with the biomass at the two salinity levels. Subsequently, two subsets of 10 genotypes each were selected on the basis of extreme differences in biomass at the two salinity levels while showing relatively similar biomass in control conditions. Carbon isotope discrimination (Δ13C), nitrogen isotope composition (δ15N), and the concentration of nitrogen, phosphorus and several ions (K+, Na+, Ca2+, Mg2+) were analysed in the two subsets for the three treatments. At 12 dS m-1, K+ concentration, K+/Na+ ratio, Δ13C and δ15N correlated positively and Na+ correlated negatively with shoot biomass. Under control conditions and at 17 dS m-1 no correlation was observed. However, the trait that correlated best with genotypic differences in biomass was δ15N at 12 dS m-1. This trait was the first variable chosen at each of the two salinity levels in a stepwise a...Continue Reading

References

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Citations

Apr 15, 2015·Journal of Integrative Plant Biology·Salima YousfiMaria Dolores Serret
Mar 14, 2019·Rapid Communications in Mass Spectrometry : RCM·Luan Zi SunTongtian Guo
Jun 1, 2012·Functional Plant Biology : FPB·Abdelhalim ElazabJos Luis Araus
Jul 1, 2013·Functional Plant Biology : FPB·Jos Luis ArausMar A Teresa Nieto-Taladriz
Feb 12, 2021·Plant Science : an International Journal of Experimental Plant Biology·José L ArausMaria D Serret

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