Three polyphenol oxidases from hybrid poplar are differentially expressed during development and after wounding and elicitor treatment 

 -  Physiologia Plantarum, 122(3), p.344-353, 2004 .
<br/><br/> The expression of three polyphenol oxidase (PPO; EC 1.10.3.1)genes was investigated in hybrid poplar (Populus trichocarpa · P. deltoides). PtdPPO1 was previously isolated as a wound- and herbivore-inducible PPO (Constabel et al. Plant Physiol 124: 285-295, 2000), whereas PtdPPO2 and PtdPPO3 are two novel hybrid poplar PPO genes isolated from stem and root tissue, respectively. Sequence analysis revealed that the three PPOs were 60-66