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

作　　者：Ashaduzzaman Sagar Md.Sabibul Haque Md.Alamgir Hossain Md.Nesar Uddin Jannat E.Tajkia Md.Ashik Mia Toufika Hossain Shabi Md.Solaiman Ali Fakir Md.Abdul Kader Walid Soufan Md.Atikur Rahman Muhammad Aamir Iqbal Mohammad Sohidul Islam Ayman El Sabagh A.K.M.Zakir Hossain 

机构地区：[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 [8]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

出　　处：《Phyton-International Journal of Experimental Botany》2023年第8期2349-2368,共20页国际实验植物学杂志（英文）

基　　金：This research was funded by the Researchers Supporting Project No. (RSP2023R390),King Saud University, Riyadh, Saudi Arabia.

摘　　要：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 plantfitness 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 concen-trations(K^(+),Na^(+) and K^(+)/Na^(+)),photochemical efficiency of photosystem II(F_(v)/F_(m)),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.Thesefindings open new research avenues for salt stress alleviation by identifying elite salt-to-lerant genotypes of sorghum for breeding programs.

关 键 词：Salinity tolerance SORGHUM photosynthesis PROLINE ion accumulation genotypic variance 

分 类 号：Q94[生物学—植物学]