Figure 1.

The Growth of PRs and LRs Is Differentially Affected by Salt Stress.

(A) Morphology of the Col-0 root system grown on standard media for 6 dpg then transferred to standard, 100 mM NaCl, or 140 mM NaCl media conditions for 4 d. Arrowheads mark the position of the root tip at the time of transfer from standard to treatment conditions.

(B) and (C) Quantitation of preemergent and late stages of LR development in root region A (B) and region B (C) after transfer to standard or salt stress conditions (n > 10 seedlings).

(D) Average PR and LR length for seedlings transferred to 100 or 140 mM NaCl. Measurements are expressed as a percentage of the length under standard conditions (n > 20 seedlings).

(E) and (F) Suppression of LR (E) and PR (F) growth under 100 mM NaCl conditions measured as a percentage of reduction relative to standard conditions. Seedlings were transferred to salt at different days postgermination (dpg) and grown for 4 dpt (n > 8 seedlings).

(G) Number of emerged LRs formed in 6, 7, or 8 dpg seedlings before transfer (n > 30 seedlings).

Error bars indicate se. Asterisks mark significant changes in salt response based on a Student’s t test, P value < 0.05.

[See online article for color version of this figure.]