Response of soybean nodules to exogenously applied caffeic acid during NaCl-induced salinity
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Date
2015
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
affeic acid acts as an antioxidant to scavenge reactive oxygen species, but its influence on plant responses to abi-
otic stresses is only partially understood. Here, we investigated the influence of exogenously applied caffeic acid
on soybean during NaCl-induced salinity. Exogenously applied caffeic acid reduced the deleterious effects of
salinity stress on soybean plants and increased nitric oxide content in root nodules and this corresponded with
elevated cyclic guanosine monophosphate content in the nodules. Salinity stress reduced nodule legheamoglobin
content and nitrogenase activity whereas exogenous application of caffeic acid to NaCl-treated plants reversed
these negative effects of NaCl on legheamoglobin content and nitrogenase activity. Hydrogen peroxide (H2O2)
and malondialdehyde contents in soybean root nodules from plants exposed to salinity were lower when
these plants were supplemented with exogenous caffeic acid than when no caffeic acid was supplemented.
We suggest that caffeic acid enhances nitric oxide biosynthesis, which possibly acts to reduce salinity-induced
oxidative stress through a mechanism that involves nitric oxide signaling coupled with cyclic guanosine
monophosphate-mediated signaling to scavenge reactive oxygen species.
Description
Keywords
Caffeic acid, Nitric oxide, Salinity, Biotechnology
Citation
Klein, A. et al. (2015). Response of soybean nodules to exogenously applied caffeic acid during NaCl-induced salinity. South African Journal of Botany, 96, 13-18. https://doi.org/10.1016/j.sajb.2014.10.016