Phloem-feeding aphids cause serious damage to plants. The mechanisms of plant-aphid interactions are only partially understood and involve multiple pathways, including phytohormones.
In this study, the nitrate transporter gene CmNRT1 was isolated from the chrysanthemum variety ‘Nannongxuefeng’. The full-length cDNA contains an open reading frame of 1761 bp encoding 587 residues. Using qRT-PCR, we found that CmNRT1 was induced by 10 mM NO3- in roots and shoots. Two Arabidopsis thaliana transgenic plants expressing CmNRT1 were selected for functional analyses. Root 15N influx in wild-type and transgenic A. thaliana lines under 10 or 0.2 mM 15NO3 was tested.