Plant ionic relation and whole-plant physiological responses to waterlogging, salinity and their combination in barley

2017 ◽  
Vol 44 (9) ◽  
pp. 941 ◽  
Author(s):  
Zhinous Falakboland ◽  
Meixue Zhou ◽  
Fanrong Zeng ◽  
Ali Kiani-Pouya ◽  
Lana Shabala ◽  
...  

Waterlogging and salinity stresses significantly affect crop growth and global food production, and these stresses are often interrelated because waterlogging can lead to land salinisation by transporting salts to the surface. Although the physiological and molecular mechanisms of plant responses to each of these environmental constraints have been studied in detail, fewer studies have dealt with potential mechanisms underlying plant tolerance to the combined stress. This gap in knowledge is jeopardising the success of breeding programs. In the present work we studied the physiological and agronomical responses of 12 barley varieties contrasting in salinity stress tolerance to waterlogging (WL), salinity (NaCl) and combined (WL/NaCl) stresses. Stress damage symptoms were much greater in plants under combined WL/NaCl stress than those under separate stresses. The shoot biomass, chlorophyll content, maximum photochemical efficiency of PSII and shoot K+ concentration were significantly reduced under WL/NaCl conditions, whereas shoot Na+ concentration increased. Plants exposed to salinity stress showed lower damage indexes compared with WL. Chlorophyll fluorescence Fv/Fm value showed the highest correlation with the stress damage index under WL/NaCl conditions (r = –0.751) compared with other measured physiological traits, so was nominated as a good parameter to rank the tolerance of varieties. Average FW was reduced to 73 ± 2, 52 ± 1 and 23 ± 2 percent of the control under NaCl, WL and combined WL/NaCl treatments respectively. Generally, the adverse effect of WL/NaCl stress was much greater in salt-sensitive varieties than in more tolerant varieties. Na+ concentrations of the shoot under control conditions were 97 ± 10 µmol g–1 DW, and increased to 1519 ± 123, 179 ± 11 and 2733 ± 248 µmol g–1 under NaCl, WL and combined WL/NaCl stresses respectively. K+ concentrations were 1378 ± 66, 1260 ± 74, 1270 ± 79 and 411 ± 92 µmol g–1 DW under control, NaCl, WL and combined WL/NaCl stresses respectively. No significant correlation was found between the overall salinity stress tolerance and amount of Na+ accumulated in plant shoots after 15 days of exposure to 250 mM NaCl stress. However, plants exposed to combined salinity and WL stress showed a negative correlation between shoot Na+ accumulation and extent of salinity damage. Overall, the reported results indicate that K+ reduction in the plants under combined WL/NaCl stress, but not stress-induced Na+ accumulation in the shoot, was the most critical feature in determining the overall plant performance under combined stress conditions.

2020 ◽  
Vol 7 (8) ◽  
pp. 2214-2228 ◽  
Author(s):  
Jing An ◽  
Peiguang Hu ◽  
Fangjun Li ◽  
Honghong Wu ◽  
Yu Shen ◽  
...  

Engineered nanomaterials interfaced with plant seeds can improve stress tolerance during the vulnerable seedling stage.


2015 ◽  
Vol 42 (3) ◽  
pp. 252 ◽  
Author(s):  
Min Zhu ◽  
Meixue Zhou ◽  
Lana Shabala ◽  
Sergey Shabala

Salinity tolerance is a complex trait – both physiologically and genetically – and the issue of which mechanism or trait has bigger contribution towards the overall plant performance is still hotly discussed in the literature. In this work, a broad range of barley (Hordeum vulgare L. and Hordeum spontaneum L.) genotypes contrasting in salinity stress tolerance were used to investigate the causal link between plant stomatal characteristics, tissue ion relations, and salinity tolerance. In total, 46 genotypes (including two wild barleys) were grown under glasshouse conditions and exposed to moderate salinity stress (200mM NaCl) for 5 weeks. The overall salinity tolerance correlated positively with stomata density, leaf K+ concentration and the relative contribution of inorganic ions towards osmotic adjustment in the shoot. At the same time, no correlation between salinity tolerance and stomatal conductance or leaf Na+ content in the shoot was found. Taken together, these results indicate the importance of increasing stomata density as an adaptive tool to optimise efficiency of CO2 assimilation under moderate saline conditions, as well as benefits of the predominant use of inorganic osmolytes for osmotic adjustment in barley. Another finding of note was that wild barleys showed rather different strategies dealing with salinity, as compared with cultivated varieties.


2016 ◽  
Vol 40 (7) ◽  
pp. 1009-1020 ◽  
Author(s):  
Min Zhu ◽  
Meixue Zhou ◽  
Lana Shabala ◽  
Sergey Shabala

Sugar Tech ◽  
2010 ◽  
Vol 12 (1) ◽  
pp. 59-63 ◽  
Author(s):  
Priyanka Saxena ◽  
R. P. Srivastava ◽  
M. L. Sharma

2021 ◽  
Author(s):  
Pooja Choudhary ◽  
Lydia Pramitha ◽  
Sumi Rana ◽  
Shubham Verma ◽  
Pooja Rani Aggarwal ◽  
...  

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