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Triticum aestivum: antioxidant gene profiling and morpho-physiological studies under salt stress

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Abstract

Background

Soil salinity drastically reduced wheat growth and production in Pakistan. It is a need of an hour to identify the best suitable salt tolerance or resistant wheat varieties which shows good growth under salinity affected areas. In presented study, two wheat varieties Johar (salt tolerant) and Sarsabaz (salt sensitive) were examined under NaCl stress conditions.

Methods

Antioxidant enzyme activities were investigated in 10-days old wheat seedlings under 200 mM NaCl stress in hydroponic conditions. To investigate the various growth parameters, antioxidant enzyme activities such as superoxide dismutase (SOD: EC 1.15.1.1), catalase (CAT: EC 1.11.1.6) and ascorbate peroxidase (APX: EC 1.11.1.11) were monitored and studied. Besides this various growth parameters such as length of the roots, shoots, as well as Physiological parameters likes lipid peroxidation by malondialdehyde (MDA), hydrogen peroxide (H2O2), and proline contents and antioxidant enzyme activities were estimated. The effect of salinity was also observed on gene transcription level and eventually expression level.

Results

Shoot and root length were decreased in Sarsabaz variety while it showed opposite trend in johar at 200 mM salt concentration. The concentration of proline showed a noticeable rise in salt dependency. Higher concentrations of Proline in Johar were observed as compared to Sarsabaz. SOD showed the increase in activity for antioxidant enzymes. Significant increase of SOD levels were observed in shoot tissues as compared to root tissues. The results indicated that the shoots were more susceptible to salt stress. Activity of APX showed similar affects in both varieties. The production of CAT enzyme in the shoot and root tissues of both varieties showed substantial growth under increased salt stress. Furthermore, NaCl stress has increased the expression of certain genes coding for antioxidant enzymes such as catalase, superoxide dismutase, and peroxidase. Maximum expression of all the antioxidant enzyme coding genes were observed in Johar (tolerant) at 48 h exposure to salt. In contrast the expression of the all mentioned genes in Sarsabaz variety were found maximum at early hours (24 h) and gradually decreased at 48 h.

Conclusion

The study showed that the selected salt tolerant wheat variety Johar is significantly resistant to 200 mM NaCl salt level as compared to Sarsabaz.

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Acknowledgements

The authors would like to acknowledge the Deanship of Scientific Research at King Khalid University, Saudi Arabia, for their technical support RGP.2/169/42.

Funding

Funding for research was provided from project number RGP.2/169/42, King Saud University, Saudi Arabia.

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MR, Conceptualization and Validation; MG, Performed experiments; AAS, Statistical analysis, review and drafting; RTA, Review; MJ, Writing; SU, Drafting and funding support.

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Correspondence to Musarrat Ramzan or Anis Ali Shah.

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Ramzan, M., Gillani, M., Shah, A.A. et al. Triticum aestivum: antioxidant gene profiling and morpho-physiological studies under salt stress. Mol Biol Rep 50, 2569–2580 (2023). https://doi.org/10.1007/s11033-022-07990-1

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