Fig. 3

Variation of the functional categories of the PgbZIP transcripts. a Number variation of the PgbZIP transcripts categorized into a subcategory among 14 tissues of a 4-year-old plant. b Number variation of the PgbZIP transcripts categorized into a subcategory among the 4-year-old roots of 42 genotypes. c Number variation of the PgbZIP transcripts categorized into a subcategory among the roots of differently aged plants