Combining spring wheat genotypes with contrasting root traits for a better use of water resources in soil? Evidence from column-scale water stable isotopic experiments
Controlled experiments reveal how genotype mixtures enhance water uptake in various soil water conditions, indicating their importance for resource efficiency.
Key Points
This research investigates the effects of mixed wheat genotypes with different root systems on water uptake under varying soil moisture conditions.
Conducted a controlled plant-soil column experiment
Quantified daily vertical profiles of root water uptake
Applied Bayesian modelling on stable isotopic measurements
Monitored plant soil water status and root traits
Shallow root system (SRS) showed higher root water uptake in topsoil compared to deep root system (DRS)
DRS outperformed SRS in subsoil water uptake
In genotype mixtures, both types maintained complementary water uptake patterns
In response to water deficit, subsoil uptake increased by 0.5% cm −1 while topsoil decreased by 1.2% cm −1 compared to monocultures