TITLE:
Effect of Jasmonic Acid on Photosynthetic Pigments and Stress Markers in Cajanus cajan (L.) Millsp. Seedlings under Copper Stress
AUTHORS:
Sharma Poonam, Harpreet Kaur, Sirhindi Geetika
KEYWORDS:
Jasmonic Acid; Copper Sulphate; Lipid Peroxidation; Superoxide Dismutase; Guaiacol Peroxidase; Total Chlorophyll; Carotenoids
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.4 No.4,
April
17,
2013
ABSTRACT:
Jasmonates are class of plant growth regulators act as signal molecule
that intercede various components in physiological and metabolic regulation,
stress responses and possibly communication through signal transduction.
Oxidative stress due to heavy metal exposure stimulates synthesis and activity
of antioxidant metabolites and enhances antioxidant enzyme activities that
could protect plant tissues. The aim of this study was to investigate the
exogenous effect of JA at seed level which can transduce throughout seedling
growth and regulate antioxidant activities such as superoxide dismutase (SOD;
EC 1.15.1.1) and guaiacol peroxidase
(POD; EC 1.11.1.7) in 12 days old seedlings of pigeon pea (Cajanus
cajan (L.) Millsp.) in presence and/or absence of copper. The activity of
SOD and POD increased significantly in presence of Cu2+ after seed
priming with JA. JA also helps in chlorophyll and carotenoid accumulation and
neutralizes the toxic effect of Cu2+ on seedlings. This is the first
report of JA effect on photosynthetic pigment accumulation and H2O2 mitigating enzymes i.e. SOD and POD
and it could be recommended that seed priming with JA help in ameliorating
toxic effect of Cu2+.