Physiological and Biochemical Responses of Medicagotruncatula to Drought Stress | ||||
| Egyptian Journal of Botany | ||||
| Article 21, Volume 56, Issue 3, September 2016, Page 895-912 PDF (1.01 MB) | ||||
| Document Type: Regular issue (Original Article) | ||||
| DOI: 10.21608/ejbo.2016.4023 | ||||
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| Abstract | ||||
| It is frequently observed that drought stress decreased plant growth decreased plant growth and induced cellular damages. However, the damages. However, the underlying physiological and biochemical mechanisms are not well understood. Medicagotruncatulawassubjected to drought stress by water withdrawing at mature stage and for one week. Drought stress reduced plant growth, inhibited photosynthesis, stomatal conductance and induced oxidative stress. Water stress induced changes e.g. it increased osmo-protectants (proline, glycine betaine), and the level of oxidative stress parameters (H2O2 and lipid peroxidation). In parallel with higher levels of H2O2 and MDA, there were increase in NADPH oxidase and lipoxygenase (LOX) activities in Medicagotruncatula. Presumably as a consequence of the induction of H2O2 production, activation in some antioxidant defense components was observed (e.g. increased superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPX), peroxidase (POX) and glutathione reductase (GR). Other antioxidant component were also significantly increased by drought stress. | ||||
| Keywords | ||||
| drought; legume; Medicagotruncatula; Oxidative Stress; Plant redox network | ||||
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