Fig. 3.

A schematic model of the rootstock-induced transcriptional response associated with drought tolerance in leaves of sweet orange. Ovals represent proteins or hormones and squares represent processes. Representative proteins are shown below the corresponding ovals and squares. Dotted lines represent indirect connections and solid lines represent direct connections. Abbreviations: ABA: abscisic acid; ABI1: ABA-insensitive 1; ABI2: ABA-insensitive 2; AGP: arabinogalactan protein; APL, ADP-glucose pyrophosphorylase large subunit; APS: ADP-glucose pyrophosphorylase; APX: ascorbate peroxidase; BAM: beta-amylase; BFRUCT: beta-fructosidase; bHLH: basic helix-loop-helix motif; BXL: β-xylosidase; bZIP: basic region/leucine zipper motif; CAB: chlorophyll a/b binding protein; CHY1: beta-carotene hydroxylase 1; CsHAB1: Citrus sinensis hypersensitive to ABA 1; CsPYL4: Citrus sinensis pyrabactin resistance 1-like 4; CsPYL5: Citrus sinensis pyrabactin resistance 1-like 5; DREB2A: dehydration-responsive element binding protein 2A; ERD: early responsive to dehydration; ERT2: ethylene-responsive nuclear protein 2; EXP: expansin; HSP: heat shock protein; GBSS: granule bound starch synthase; HXK: hexokinase; LRRs: leucine rich repeats; MPKs: mitogen-activated kinases; MYB: myeloblastosis; NAC: NAM/ATAF/CUC; PEI: pectinesterase inhibitor; PG: polygalacturonase; PKs: protein kinases; PLL: pectin lyase-like; PMT: putrescine N-methyltransferase; PP2C: protein phosphatase type 2C; PRP: proline-rich protein; PSBA: photosystem II reaction center protein D1; PSBO: photosystem II subunit O; PSBP: photosystem II subunit P; PYR/PYL/RCAR: pyrabactin resistance 1/PYR1-like/regulatory components of ABA receptor; SnRK2: SNF1- related protein kinase 2; SOD: superoxide dismutase; SPS: sucrose phosphate synthase; SRK2C: SNF1-related protein kinase 2C; STKs: Serine/Threonine-protein kinases; SUS: sucrose synthase; TFs: transcription factors; WAKs: wall-associated kinases; WRKY: tryptophan-arginine-lysine-tyrosine domain; ZF: zinc finger