The Effects of Zinc and Salinity on Growth, Chemical Composition and Vascular Tissues of Wheat

Document Type : Research Paper

Authors

1 Researcher, Khorasan Agricultural and Nat. Resources Research Center

2 Professor, Tarbiat Modarres University, respectively.

Abstract

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 a randomized complete block design with three replications. Treatments were two levels of salinity (0 and 100 mM prepared with the same equivalents 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, increased shoot dry matter by 4.5 fold in saline condition as compared with to          non-saline conditions. Salinity decreased root dry matter significantly. Zn application increased root dry matter (4.3%), but it was not statistically 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+  ratios in shoots increased with Zn application . Salinity induced structural changes in stem. Fewer xylem vessels with smaller size were observed in stressed plants. Zn improved growth and enhanced vascular tissues in comparison with stressed plants grown at the same salinity. level 

Keywords

References

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Iranian Journal of Soil Research
Volume 19, Issue 1
May 2005
Pages 113-121

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