Skip to main content
. 2017 Nov 13;13(11):e1007076. doi: 10.1371/journal.pgen.1007076

Fig 7. Models for functions of SLs and KARs/KAI2-ligand (KL) in plant growth, development and drought response.

Fig 7

(A) SL-regulation of shoot branching, senescence, secondary thickening and root development is mediated by SL-specific receptor D14. KAR-regulation (or hypothetical KL-regulation) of seed germination, hypocotyl elongation and leaf development is mediated by KAI2. MAX2 is the checkpoint for both SL and KAR/KL signaling pathways in plant growth and development. (B) SLs and KARs/KL regulate plant resistance to drought through D14-MAX2 and KAI2-MAX2 cascade, respectively. Question mark indicates the contribution of D14 to drought resistance was unknown until this study. (C) Biomass of kai2-2, d14-2, kai2-2 d14-2 and WT plants under well-watered control and drought stress (n = 9 biological replicates). (D) Biomass reduction of kai2-2, d14-2, kai2-2 d14-2 and WT plants under drought relative to respective well-watered control. Data represent the means and standard errors (n = 9 biological replicates). Different letters above the error bars indicate significant differences (P < 0.05) among the genotypes according to a Tukey's honest significant difference test. (E) Averaged pot weights of kai2-2, d14-2, kai2-2 d14-2 and WT plants during drought stress (n = 9 biological replicates). Black arrows indicate when water was added to the root growth area in the soil. Red arrow indicates when biomass was measured. (F) Plant phenotypes before harvest.