| Type |
Journal Article |
| Year |
2022 |
| Title |
Exogenous application of spermidine mitigates the adverse effects of drought stress in faba bean (Vicia faba L.) |
| Journal |
Functional Plant Biology |
| Label |
U1-Muhovski |
| Volume |
49 |
| Issue |
4 |
| Pages |
405-420 |
| Date |
March 2022 |
| Endnote Keywords |
drought stress, faba bean, gene expression, spermidine, qRT-PCR |
| Abstract |
In Tunisia, drought stress is a major environmental factor limiting crop production and causing relatively low and unstable faba bean yields. In the present study, we explored the putative role of spermidine (0.5, 1, 1.5 and 2 mM) in ameliorating the effects of drought stress induced by PEG-6000 (-0.58 MPa) in faba bean seedlings. Drought stress reduced photosynthetic performance, chlorophyll (Chlt) and relative water content (RWC) in leaves of faba bean variety Badii. Moreover, drought increased proline, electrolyte leakage (EL) and malondialdehyde (MDA) content by inducing reactive oxygen species (H2O2) generation in leaves. However, applying spermidine increased the activities of catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX) and guaiacol peroxidase (GPX). The results show that the application of spermidine especially at rate of 1.5 mM effectively reduces oxidative damage and alleviates negative effects caused by drought stress. In addition, exogenous spermidine increased the expression of polyamine biosynthetic enzymes genes (VfADC, VfSAMDC and VfSPDS), and reduced the expression of VfSPMS suggesting that exogenous spermidine can regulate polyamines metabolic status under drought challenge, and consequently may enhance drought stress tolerance in faba bean. qRT-PCR analysis revealed that some drought responsive genes (VfNAC, VfHSP, VfNCED, VfLEA, VfCAT, VfAPX, VfRD22, VfMYB, VfDHN, VfERF, VfSOD and VfWRKY) from various metabolic pathways were differentially expressed under drought stress. Overall, these genes were more abundantly transcribed in the spermidine-treated plants compared to untreated suggesting an important role of spermidine in modulating faba bean drought stress response and tolerance. |
| Fichier |
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| Authors |
Abid, G., Nefissi, R., Ghouili, E., Muhovski, Y., Jebara, S., Abdelkarim, S., Chaieb, O., Redjem, Y., El Ayed, M., Barhoumi, F., Souissi, F., Jebara, M. |
