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The relationship between transpiration and nutrient uptake in wheat changes under elevated atmospheric CO 2
Author(s) -
Houshmandfar Alireza,
Fitzgerald Glenn J.,
O'Leary Garry,
TauszPosch Sabine,
Fletcher Andrew,
Tausz Michael
Publication year - 2018
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/ppl.12676
Subject(s) - transpiration , nutrient , manganese , nitrogen , potassium , chemistry , sulfur , agronomy , phosphorus , magnesium , environmental science , environmental chemistry , photosynthesis , biology , biochemistry , organic chemistry
The impact of elevated [CO 2 ] (e[CO 2 ]) on crops often includes a decrease in their nutrient concentrations where reduced transpiration‐driven mass flow of nutrients has been suggested to play a role. We used two independent approaches, a free‐air CO 2 enrichment (FACE) experiment in the South Eastern wheat belt of Australia and a simulation study employing the agricultural production systems simulator (APSIM), to show that transpiration (mm) and nutrient uptake (g m −2 ) of nitrogen (N), potassium (K), sulfur (S), calcium (Ca), magnesium (Mg) and manganese (Mn) in wheat are correlated under e[CO 2 ], but that nutrient uptake per unit water transpired is higher under e[CO 2 ] than under ambient [CO 2 ] (a[CO 2 ]). This result suggests that transpiration‐driven mass flow of nutrients contributes to decreases in nutrient concentrations under e[CO 2 ], but cannot solely explain the overall decline.