Antioxidant Activity of Lichen Parmotrema austrosinense and its Antimicrobial Effect on Selected Plant Pathogens

Shyam Kumar Rajaram, Ganesh Moorthy Innasimuthu, Ronaldo Anuf Alexander, Rakesh Varghese, Murugan Munusamy, Sanjeeva Nayaka, Dalip Kumar Upreti


Parmotrema austrosinense(Zahlbr.) Hale is one of the lichens used as spices and also it has
medicinal property. The goal of this investigation was to assess the antioxidant, reducing power,
free radical scavenging and antiphyto pathogenic effect of P. austrosinense. Lichen sample was
extracted with different solvents - benzene, methanol, chloroform and acetone. The benzene
extract showed a strong antioxidant activity (5.6650.0065) followed by chloroform extract
(3.6480.0029), acetone extract (2.7700.0078) and methanol extract (2.430 0.0046). The
methanolic extract of lichen showed the highest reducing power followed by the acetone and nonpolar
solvents like chloroform and benzene. Among the four solvents chosen, methanol extract of
lichen showed the highest free radical scavenging activity followed by acetone, chloroform and
benzene. The antimicrobial activity non-polar solvents like chloroform and benzene extract
showed highest antimicrobial activity against three tested fungi (Fusarium oxysporum, Rhizoctonia
solani, Sclerotium rolfsii) and bacterial plant pathogens(Bacillus sp.,Xanthomonas phaseoli and
Erwinia chrysanthemi)followed by methanol and acetone extracts and streptomycin was used as
a control antibiotic.


Parmotrema austrosinense, Antioxidant, DPPH, free radical scavenging, antiphytopathogenic

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