Osmotic Adjustment in Roots and Leaves of two Cotton Cultivars with Different Tolerance to Soil Salinity
Journal Title: Biomedical Journal of Scientific & Technical Research (BJSTR) - Year 2019, Vol 15, Issue 2
Abstract
The object of this study was to analysis the change of organic and inorganic solutes and their function to Osmotic Adjustment (OA) in the leaves and roots of cotton (Gosspi-um hirsutum L) subjected to heterogeneous salinity conditions. We grew two cotton culti-vars, salt-sensitive ‘Simian 3’ and salt-tolerant ‘CCRI-79’, in low-, medium- and high-salinity conditions. All conditions were subjected to three replications. We measured dry weight of leaves and roots, as well as fluctuations in organic and inorganic solute content across all treatments. Soil salinity reduced the biomass in cotton leaves and roots, especially in ‘Simian 3’. Increasing soil salinity increased Na+ and Cl- content in roots and leaves of two cultivars. Soil salinity decreased K+, Ca2+ and Mg2+ contents in the leaves of two cultivars, but root Ca2+ and Mg2+ contents in ‘CCRI-79’ remained stable, while root K+, Ca2+ and Mg2+ con-tents decreased in ‘Simian 3’. Moreover, the osmotic potentials (ψs) of leaves and roots were lower in ‘Simian 3’ than in ‘CCRI-79’, mainly owing to the higher content of Na+ and Cl- in the former cultivar. Under low salinity, K+ contributed the most among inorganic solutes to ψs, but its contribution declined as soil salinity increased, especially in ‘Simian 3’. Amino acids were the largest contributors among organic solutes to root and leaf ψs, but no differences in amino acid contribution were observed between two cultivars. The major contributors to OA in cotton leaves and roots were Na+ and Cl-, which enable ‘CCRI-79’ to maintain a more suitable OA under heterogeneous salinity than ‘Simian 3’. This study suggests that OA could be a mechanism developed by cotton to overcome fluctuating salinity conditions, and this strategy could be useful for developing physiological-based screening methods in tradition-al breeding programs in saline soils.
Authors and Affiliations
Tingting Chen, Yong Chen, Xiaolong Wang, Lei Zhang
Keywords
Related Articles
- EP ID EP587762
- DOI 10.26717/BJSTR.2019.15.002679
- Views 146
- Downloads 0
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