Figure 4.

Stresses Inhibit NRT1.5 Expression through ET/JA Signaling.

Four-week-old plants under control conditions or exposed to 20 μM ACC, 50 μM MeJA, 20 μM ACC + 50 μM MeJA (A+J), 200 μM CdCl₂, or 150 mM NaCl for 6 h as indicated. The expression levels of NRT1.5 were determined by quantitative RT-PCR. Data were normalized to those of SAND. Values are means ± sd; n = 3 to 4.

(A) and (B) NRT1.5 expression in roots of ctr1-8 (A), eto1 (B), and their wild-type control Col-0.

(C) NRT1.5 expression in roots of ein2-50, coi1-1, ein2-50 coi1-1, and Col-0 plants.

(D) NRT1.5 expression in roots of ora59-1 erf104, tri-1, tri-2, and wild-type control plants.