THE ROLE OF ANTIOXIDANTS IN INDUCING WHEAT FLAG LEAF OSMOTIC ADJUSTMENT UNDER SALINITY STRESS | ||
| Journal of Plant Production | ||
| Article 11, Volume 34, Issue 11, November 2009, Pages 10663-10685 PDF (977.11 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2009.119173 | ||
| Author | ||
| S. F. Gadalla* | ||
| Agricultural Botany Department, Faculty of Agriculture, Mansoura University, Egypt. | ||
| Abstract | ||
| Salt stress up to 11.5 dSm-1 causes a significant reduction in water potential, osmotic potential, as well as relative water content, and water content. On the other hand, turgor potential and osmotic adjustment were significantly increased due to inducing increasing the higher accumulation of compatible osmolytes which leads to decreasing flag leaf area and grain yield per plant. Application of both antioxidants, in particular, ascorbic acid increased significantly flag leaf area, and grain yield per plant due to osmotic adjustment and maintaining leaf turgor potentials as a consequence of increasing leaf water potential, water content and relative water content as compared to control plants. On the other hand, application of both antioxidants under all salinity levels, nullify the harmful effect of salinity effects on flag leaf area and grain yield per plant due to increasing osmolyte accumulation, maintaining turgor potential and osmotic adjustments which in turn increasing flag leaf area and grain yield per plant. Anatomically, increasing salinity levels decreased thickness of leaf blade at midrib region, thickness of mesophyll tissue, tangential dimension of midrib vascular bundle, thickness of upper epidermis, thickness of lower epidermis, thickness of big motor cell, and tangential dimension of big xylem vessel. Treatment with either ascorbic acid or tocopherol at 100 mg/L and their interactions with salinity increased all the above mentioned parameters in both nonsalinized and salinized plants. Ascorbic acid is the most effective in this concern. In conclusion, wheat plants responded to an increased ion influx in their cells by increasing the osmolytes synthesis and accumulation under salt stress, which further increased with antioxidants treatment and helped in maintaining the osmotic balance. | ||
| Keywords | ||
| Ascorbic; tocopherol; soil salinity; growth; yield; wheat | ||
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