Genotypic divergence, photosynthetic efficiency, sodium extrusion, and osmoprotectant regulation conferred salt tolerance in Sorghum

Sagar, A. and Haque, Md.S. and Hossain, Md. A. and Uddin, Md. N. and Tajkia, J.E. and Mia, Md.A. and Shabi, T.H. and Fakir, Md. S.A. and Kader, Md. Abdul and Soufan, W. and Rahman, M.A. and Iqbal, M.A. and Islam, M.S. and EL-Sabagh, A. and Hossain, A.K.M.Z. (2023) Genotypic divergence, photosynthetic efficiency, sodium extrusion, and osmoprotectant regulation conferred salt tolerance in Sorghum. Phyton, 92 (8). pp. 2349-2368. ISSN 0031-9457

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Abstract

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.

Item Type:	Journal Article
Subjects:	S Agriculture > S Agriculture (General) S Agriculture > SB Plant culture
Divisions:	School of Agriculture, Geography, Environment, Ocean and Natural Sciences (SAGEONS)
Depositing User:	Md. Abdul Kader
Date Deposited:	17 Aug 2023 02:58
Last Modified:	17 Aug 2023 02:58
URI:	https://repository.usp.ac.fj/id/eprint/14102

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