Figure 7.

Changes in K⁺ instantaneous and average secretion rates in salt glands of diploid (2x) and tetraploid (4x) Plumbago auriculata induced by NaCl stress and effects of LaCl₃, Na₃VO₄, and DPI on K⁺ secretion rate under NaCl stress. (A) Instantaneous K⁺ secretion rate in salt glands under control conditions. (B) Instantaneous K⁺ secretion rate in salt glands under NaCl stress. (C) Instantaneous K⁺ secretion rate in salt glands under NaCl stress with exogenous CaCl₂ addition. (D) Instantaneous K⁺ secretion rate in salt glands under NaCl stress with LaCl₃ addition. (E) Instantaneous K⁺ secretion rate in salt glands under NaCl stress with Na₃VO₄ addition. (F) Instantaneous K⁺ secretion rate in salt glands under NaCl stress with DPI addition. (G) Average K⁺ secretion rate (~300 s) in different treatments. Each point represents the mean of the nine salt glands collected from six individual plants.