In this study, hydrogen peroxide content in the leaves of all
cultivars increased significantly with increase in salinity. Among
the cultivars, ‘Standard kailan’ and ‘Hong Kong kailan’
accumulated lower amount of H2
O2
in their leaf tissues compared
to the other cultivars. Increases in salinity induced the
concentration of H2
O2
with respective values of 47.5%. 56.0% and
56.2% for 25, 50 and 75 mM compared to the control (Fig. 3 A),
clearly suggest that plant tissue could be destroyed more rapidly
at high salinity levels not only due to osmotic stress as indicated
by reduction in RWC, but also due to excessive accumulation of
toxic materials such as H2
O2
. Results in Fig. 2 B depicted that the
concentration of H2
O2
was negatively correlated (r = -0.578) with
leaf relative water content (RWC)