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2015 ; 5
(ä): 14078
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Hydrogen sulfide modulates cadmium-induced physiological and biochemical
responses to alleviate cadmium toxicity in rice
#MMPMID26361343
Mostofa MG
; Rahman A
; Ansary MM
; Watanabe A
; Fujita M
; Tran LS
Sci Rep
2015[Sep]; 5
(ä): 14078
PMID26361343
show ga
We investigated the physiological and biochemical mechanisms by which H2S
mitigates the cadmium stress in rice. Results revealed that cadmium exposure
resulted in growth inhibition and biomass reduction, which is correlated with the
increased uptake of cadmium and depletion of the photosynthetic pigments, leaf
water contents, essential minerals, water-soluble proteins, and enzymatic and
non-enzymatic antioxidants. Excessive cadmium also potentiated its toxicity by
inducing oxidative stress, as evidenced by increased levels of superoxide,
hydrogen peroxide, methylglyoxal and malondialdehyde. However, elevating
endogenous H2S level improved physiological and biochemical attributes, which was
clearly observed in the growth and phenotypes of H2S-treated rice plants under
cadmium stress. H2S reduced cadmium-induced oxidative stress, particularly by
enhancing redox status and the activities of reactive oxygen species and
methylglyoxal detoxifying enzymes. Notably, H2S maintained cadmium and mineral
homeostases in roots and leaves of cadmium-stressed plants. By contrast, adding
H2S-scavenger hypotaurine abolished the beneficial effect of H2S, further
strengthening the clear role of H2S in alleviating cadmium toxicity in rice.
Collectively, our findings provide an insight into H2S-induced protective
mechanisms of rice exposed to cadmium stress, thus proposing H2S as a potential
candidate for managing toxicity of cadmium, and perhaps other heavy metals, in
rice and other crops.