Stage-specific regulation of four HD-ZIP III transcription factors during polar pattern formation in Larix leptolepis somatic embryos
Keywords: PAT, polar auxin transport; PIN, PIN-FORMED protein; NPA, 1-N-naphthylphthalamic acid; PCD, programmed cell death; HD-ZIP III, Class III Homeodomain Leucine Zipper proteins; PEM, proembryogenic mass; FAA, formalin–alcohol–acetic acid; SAM, shoot apical me