Fig. 4From: Morphological, physiological, and transcriptional responses to low nitrogen stress in Populus deltoides Marsh. clones with contrasting nitrogen use efficiencyExpression analysis of differentially expressed genes (DEGs) related to porphyrin and chlorophyll metabolism (A), carotenoid biosynthesis (B), carbon fixation in photosynthetic organisms (C), biosynthesis of amino acids (D), plant hormone signal transduction (E), and nitrogen metabolism (F) in genotypes A and C during the response to low N stressBack to article page