ABA-dependent K⁺ flux is one of the important features of the drought response that distinguishes Catalpa from two different habitats

Figures & data

Figure 1. Free proline contents in Catalpa fargesii and C. fargesii f. duclouxii treated with PEG and ABA. Free proline content of roots after 7 d of treatment with PEG, ABA, and PEG + ABA. n = 3–5, P < .01.

Figure 2. K⁺ efflux in roots of C. fargesii and C. fargesii f. duclouxii after 1 d of treatment with PEG, ABA, or PEG + ABA. Average K⁺ efflux for the measurement period (400 s) (c). Positive values indicate K⁺ efflux. n = 3–6, P < .01.

Figure 3. K⁺ efflux in roots of C. fargesii (a, b) and C. fargesii f. duclouxii (c, d) after 7 d of treatment with PEG, ABA, or PEG + ABA. Positive values indicate K⁺ efflux. n = 3–6, P < .01.

Figure 4. K⁺ efflux in roots of Catalpa fargesii (a, b) and C. fargesii f. duclouxii (c, d) seedlings treated with TEA for 30 min following 1 d of treatment with PEG, ABA, or PEG + ABA. Positive values indicate K⁺ efflux. n = 3–6, P < .01.

Figure 5. K⁺ content in roots of Catalpa fargesii (a) and C. fargesii f. duclouxii (b) seedlings treated for 1 d and 7 d with PEG, ABA, or PEG + ABA. n = 3–6, P < .01.

Figure 6. SKOR gene expression levels in roots of Catalpa fargesii and C. fargesii f. duclouxii seedlings treated for 1 d (a) and 7 d (b) with PEG, ABA, or PEG + ABA. n = 3–6, P < .01.