Antioxidant capacities of green and cyanic leaves in the sun species, Quintinia serrata

Functional Plant Biology : FPB
Samuel O NeillK R Markham

Abstract

Anthocyanins scavenge harmful reactive oxygen species (ROS), and may provide antioxidative protection within plant cells. For the shade species Elatostema rugosum A. Cunn., it was recently established that red-leaved morphs held a significant antioxidant advantage over green morphs. It is not known whether anthocyanins confer the same protection in sun species that are exposed to elevated levels of irradiation and thus greater photooxidative stress. Quintinia serrata A. Cunn., a canopy tree species, is polymorphic for anthocyanin expression. Levels of antioxidants in leaves of red and green morphs of Q. serrata were identified, and activities quantified using enzymatic and α,α-diphenyl-β-picrylhydrazyl (DPPH) assays and cyclic voltammetry. Both morphs contained similar levels of superoxide dismutase, catalase, ascorbic peroxidase and hydroxycinnamic acids, and showed similar ranges in DPPH scavenging activity and voltammetric profiles. Anthocyanin concentrations increased with leaf age in red morphs and were positively correlated with the extent of DPPH scavenging. However, hydroxycinnamic acids were the most active methanol-extractable fraction in both morphs, contributing 27% more to the overall low-molecular-weight antioxida...Continue Reading

Citations

Feb 23, 2007·Science in China. Series C, Life Sciences·Changlian PengShaowei Chen
May 12, 2020·The New Phytologist·Ines Pena-Novas, Marco Archetti
Aug 1, 2007·Functional Plant Biology : FPB·Abby K van den Berg, Timothy D Perkins
Aug 1, 2004·Functional Plant Biology : FPB·Eduardo Pérez-TorresLeónA Bravo
Nov 6, 2020·Journal of Evolutionary Biology·Ines Pena-Novas, Marco Archetti
Feb 3, 2021·International Journal of Phytoremediation·Ashwani KumarBabu Lal Meena

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