Differential Salt Sensitivity of Two Flax Cultivars Coincides with Differential Sodium Accumulation, Biosynthesis of Osm
- PDF / 1,047,199 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 16 Downloads / 170 Views
Differential Salt Sensitivity of Two Flax Cultivars Coincides with Differential Sodium Accumulation, Biosynthesis of Osmolytes and Antioxidant Enzyme Activities Ahmad Mohammad M. Mekawy1 · Dekoum V. M. Assaha2 · Akihiro Ueda2,3 Received: 8 June 2019 / Accepted: 25 October 2019 © Springer Science+Business Media, LLC, part of Springer Nature 2019
Abstract The present study was conducted in order to determine the response of two Egyptian flax cultivars (Sakha 102 and Sakha 105) to salt stress. To this end, seedlings of both cultivars were subjected to 150 mM NaCl condition, and the growth, N a+ + and K concentrations, proline and hydrogen peroxide concentrations, and antioxidant enzyme activities were measured and compared with plants grown under non-stressed conditions. The results showed that salt stress reduced the overall growth of Sakha 102 by 38% as opposed to almost 50% reduction in Sakha 105. H 2O2 significantly increased in Sakha 105, but remained unchanged in Sakha 102. The Na+ concentration in the leaf of Sakha 102 was 30% more than in the leaf of Sakha 105. The K+ concentrations were reduced by the same degree in all tissues of both plants and the Na+/K+ ratios were similar in both cultivars (generally > 1). The proline concentration was significantly more elevated in leaf, stem, and root of Sakha 102 (5.4, 2.5, and ten-fold, respectively) than in Sakha 105 (2.3, 2.3, and 4.0-folds). CAT activity markedly increased in the root of Sakha 102 (3.5-fold), but remained unchanged in Sakha 105. Taken together, these results suggest that Sakha 102 is more salt tolerant than Sakha 105, and that differences in proline concentration and ROS production under stress may account to a greater degree in the differential tolerance. Keywords Antioxidant enzymes · Flax · ROS scavenging · Proline · Salt tolerance
Introduction High soil salt content is a factor limiting agricultural production in many regions (Yamaguchi and Blumwald 2005). In order to maximize the production potential of these regions, there is a need to develop crops tolerant to salinity. It is, therefore, important to understand the mechanisms of adaptation of plants to salt stress. Since response to salt stress is multifactorial and there are cultivar-specific variations, it is important to assess salt tolerance on a cultivar-by-cultivar basis (Assaha et al. 2017b; Chuamnakthong et al. 2019). * Akihiro Ueda akiueda@hiroshima‑u.ac.jp 1
Department of Botany and Microbiology, Faculty of Science, Minia University, El‑Minia 61519, Egypt
2
Graduate School of Biosphere Science, Hiroshima University, Higashi‑Hiroshima 739‑8528, Japan
3
Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi‑Hiroshima 739‑8528, Japan
Physiological and molecular analyses have deepened our understanding of the mode of responses and survival of plants tolerant to salt stress conditions. As soil solute potential and water conductance reduce across the root/ soil boundary (mainly due to increased N a+ concentration in soil solution), wa
Data Loading...
