Konsep Inti
Elevated CO2 leads to a global decrease in the mineral composition of Arabidopsis thaliana plants, but natural genetic variation allows for a wide range of responses, from negative to positive effects.
Abstrak
The study explored the natural genetic variation underlying the negative effect of elevated CO2 on the ionome (mineral composition) of Arabidopsis thaliana plants.
Key highlights:
Elevated CO2 globally decreased the content of most mineral elements (N, Fe, Zn, Cu, Mg) across three Arabidopsis populations, regardless of their geographic origin.
However, the study also revealed a high degree of genetic diversity in the response of the ionome to elevated CO2, with some accessions showing negative effects, others no effect, and even some benefiting from high CO2.
Genome-wide association mapping identified numerous genetic loci and candidate genes associated with the variation in mineral response to elevated CO2, including genes involved in nutrient homeostasis, transport, and metabolism.
Functional validation of one candidate gene, TIP2;2, demonstrated its role in modulating the negative effect of elevated CO2 on zinc content.
The study provides a valuable resource to understand the genetic mechanisms underlying the detrimental impact of rising atmospheric CO2 on plant mineral nutrition, which is crucial for food security.
Statistik
Elevated CO2 led to a 20-50% decrease in nitrogen content across Arabidopsis accessions.
Elevated CO2 led to a 60-100% decrease in copper, iron, and zinc content across Arabidopsis accessions.
Kutipan
"The elevation of atmospheric CO2 leads to a decline in the mineral content of C3 plants, which might pose a significant threat to food security in the coming decades."
"We show that the growth under elevated CO2 leads to a global and important decrease of the ionome content whatever the geographic distribution of the population."
"We also observed a high range of genetic diversity in the response of the ionome composition to elevated CO2, and we identified sub-populations, showing effects on their ionome ranging from the most pronounced to resilience or even to a benefit in response to elevated CO2."