Impact of saline stress on the uptake of various macro and micronutrients and their associations with plant biomass and root traits in wheat

https://doi.org/10.17221/467/2020-PSECitation:

Zhao D.Y., Gao S., Zhang X.L., Zhang Z.W., Zheng H.Q., Rong K., Zhao W.F., Khan S.A. (2021): Impact of saline stress on the uptake of various macro and micronutrients and their associations with plant biomass and root traits in wheat. Plant Soil Environ., 67: 61–70.

 

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The associations among ion uptake, root development and biomass under salt stress have not been fully understood. To study this, a pot experiment was conducted with the objective to determine the concentrations of sodium (Na), potassium (K), calcium (Ca), magnesium (Mg), zinc (Zn) and iron (Fe) and explore their associations with the biomass and root development by using eight wheat cultivars grown on control and salt stress treatments. About 6 folds increase Na+/K+ ratio in root, while 10 folds in the shoot were detected in salt stress compared to that for control. Ca, Mg, Zn concentrations in both root and shoot, and Fe concentration in the shoot were significantly changed by salt stress, except Fe concentration in the root. Principal component analysis revealed significant associations of these ions with the aboveground biomass and root traits. On salt stress treatment, the Na+/K+ ratio in shoot showed a significant negative correlation with root weight and aboveground biomass, while aboveground biomass correlated positively with lateral root length and root weight. A strategy towards manipulating the ion homeostasis, particularly Na+/K+, combined with selecting genotypes with better salt tolerance is of promise to alleviate the effects of salt stress.

 

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