Fig. 3. Elevated CO₂ enhances NO₃^- metabolism via DNR1-mediated auxin homeostasis in japonica variety Zhonghua 11 (ZH11) and its dnr1 mutants mimicking the indica DNR1 allele.

Root mRNA abundances of OsARF6 (a) and OsARF17 (b) grown under ambient CO₂ (aCO₂) and elevated CO₂ (eCO₂) conditions, relative to ZH11 under aCO₂ (set to 1). Root mRNA abundances of OsNRT1.1B (c) and OsNRT2.3a (d) relative to ZH11 under aCO₂ (set to 1). Shoot mRNA abundances of OsNPF2.4 (e) and OsNIA2 (f) relative to ZH11 under aCO₂ (set to 1). ZH11 and dnr1 indicate japonica variety Zhonghua 11 and its dnr1 mutants, respectively. a–f Data are mean ± s.e.m. (n = 3 biological replicates). P-values were generated from two-way ANOVA. Different letters indicate significant differences among treatments (P < 0.05). Source data are provided as a Source Data file.