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Genotypic Divergence, Photosynthetic Efficiency, Sodium Extrusion, and Osmoprotectant Regulation Conferred Salt Tolerance in Sorghum

Ashaduzzaman Sagar1 , Md. Sabibul Haque1, Md. Alamgir Hossain1, Md. Nesar Uddin1, Jannat E. Tajkia1, Md. Ashik Mia1, Toufika Hossain Shabi2, Md. Solaiman Ali Fakir1, Md. Abdul Kader3,4,5, Walid Soufan6, Md. Atikur Rahman7, Muhammad Aamir Iqbal8, Mohammad Sohidul Islam9, Ayman El Sabagh10,*, A. K. M. Zakir Hossain1,*

1 Department of Crop Botany, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
2 Planning and Development Division, Bangladesh Institute of Nuclear Agriculture, Mymensingh, 2202, Bangladesh
3 Department of Soil Science, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
4 Agriculture and Food Technology Discipline, School of Agriculture, Geography, Environment, Ocean and Natural Sciences, University of the South Pacific, Samoa
5 Agriculture Discipline, College of Science, Health, Engineering and Education, Murdoch University, Perth, WA 6150, Australia
6 Plant Production Department, College of Food and Agriculture, King Saud University, Riyadh, 11451, Saudi Arabia
7 Grassland and Forage Division, National Institute of Animal Science, Rural Development Administration, Cheonan, 31000, Korea
Department of Agronomy, Faculty of Agriculture, University of Poonch Rawalakot, Rawalakot, 12350, Pakistan 9 Department of Agronomy, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh
10 Faculty of Agriculture, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt

* Corresponding Authors: Ayman El Sabagh. Email: email; A. K. M. Zakir Hossain. Email: email

Phyton-International Journal of Experimental Botany 2023, 92(8), 2349-2368.


Salt stress is one of the major limitations to modern agriculture that negatively influences plant growth and productivity. Salt tolerant cultivar can provide excellent solution to enhance stress tolerance with plant fitness to unfavorable environments. Therefore, this study was aimed to screen salt tolerant sorghum genotypes through evaluating of different morphological, biochemical, and physiological attributes in response to salinity stress. In this study, we have been evaluated total six sorghum genotypes including Hybrid sorgo, Debgiri, BD-703, BD-706, BD-707, and BD-725 under salt stress (12 dS m−1 NaCl). The response variables included length and weight of root and shoot, root: shoot ratio (RSR), photosynthesis (A), transpiration rate (E), elemental concentrations (K+ , Na+ and K+ /Na+ ), photochemical efficiency of photosystem II (Fv/Fm), water use efficiency (WUE) and pigment content (chlorophyll a, and b). The results revealed that saline environment significantly reduced all response variables under study of sorghum genotypes, however, Hybrid sorgo remained unmatched by recording the maximum root and shoot traits. The same genotype recorded higher photosynthetic efficiency which was attributed to Na+ extrusion, K+ uptake and higher K+ /Na+ ratio (1.8 at stress), while these mechanisms were not fully active in rest of genotypes. Moreover, this study also implies the involvement of proline in imparting tolerance against saline environment in Hybrid sorgo genotype. Overall, BD-703 remained the most salt sensitive genotype as evident from the minimum morphological growth traits and the least biosynthesis of osmoprotectants. These findings open new research avenues for salt stress alleviation by identifying elite salt-tolerant genotypes of sorghum for breeding programs.


Cite This Article

Sagar, A., Hossain, M. A., Uddin, M. N., Tajkia, J. E., Mia, M. A. et al. (2023). Genotypic Divergence, Photosynthetic Efficiency, Sodium Extrusion, and Osmoprotectant Regulation Conferred Salt Tolerance in Sorghum. Phyton-International Journal of Experimental Botany, 92(8), 2349–2368.

cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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