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Comparative Study
Journal Article
Two Poplar Hybrid Clones Differ in Phenolic Antioxidant Levels and Polyphenol Oxidase Activity in Response to High Salt and Boron Irrigation.
Journal of Agricultural and Food Chemistry 2018 July 19
Poplar hybrids can be used for selenium (Se) and boron (B) phytoremediation under saline conditions. The phenolic antioxidant stress response of two salt and B tolerant poplar hybrids of parentage Populus trichocarpa × nigra × deltoides was studied using high-performance liquid chromatography (HPLC) and absorption-based assays to determine the antioxidant capacity, total phenolic content, hydroxycinnamic acid levels, and the enzyme activity of l-phenylalanine ammonia lyase (PAL), polyphenol oxidase (PPO), phenol peroxidase (POD), and laccase. Most remarkable was the contrasting response of the two poplar clones for PPO activity and phenolic levels to irrigation with high salt/B water. To cope with stressful growing conditions, only one clone increased its phenolic antioxidant level, and each clone displayed different PPO isoform patterns. Our study shows that poplar hybrids of the same parentage can differ in their salt/B stress coping mechanism.
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