Effect of Zinc on Growth, Chemical Composition and Anatomical Structure of Wheat under Saline Conditions.
2009
Keshavarz, Peyman | Pasban, Mohammad
To investigate the salinity and zinc (Zn) effect on growth, chemical composition and vascular tissues in wheat (Triticum aestivum) stem, twenty calcareous soil samples were collected from different regions of Khorasan Province, Iran. A factorial pot experiment was carried out as randomized completely block design with three replication. Treatments were two levels of salinity (0 and 100 mM prepared with the same equivalent of NaCl and CaCl2) and two levels of Zn(0 and 10 mg kg-1). The results showed that shoot dry matter increased with Zn application (8.3%), but decreased with salinity (61.5%). Application of 10 mg kg-1 Zn, added 4.5 fold shoot dry matter in saline condition comparing to non saline condition. Salinity decreased root dry matter significantly. Zn application increased root dry matter (4.3%) but it was not significant. Shoot/Root ratio was enhanced with increasing salinity and Zn level. Zn application increased Zn concentration and uptake in shoot, but salinity reduced them. Na+ concentration increased in plants under salinity stress (56%), while it was lowered with application of Zn (44%). K+/Na+ and Ca2+/Na+ ratio on shoot increased with Zn application . Salinity induced structural changes in stem. Few xylem vessels with smaller size were observed in stressed plants. Zn reduced salinity stress in wheat due to improvement in growth and vascular tissues structure.
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