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Keywords
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cluster analysis, salt stress, oxidative damage, wheat, Triticum aestivum L.
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Abstract
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In recent years, considerable interest has been focused on the use of physiological parameters as
selection criteria in salt tolerance ranking. Eighteen bread wheat (Triticum aestivum L.) landraces
from the west area of the Urmia Saline Lake were grown in a greenhouse in the Department of
Plant Biology and Halophytes Biotechnology Center, Azarbaijan University of Tarbiyat Moallem,
Tabriz, Iran to study the effects of increasing levels of sodium chloride (NaCl) (control, 75, and
150 mM) on the plant leaves. The experimental design was factorial with a randomized complete
block with three replications. The results showed salinity caused an obvious decrease in growth of all
landraces. Physiological parameters such as lipid peroxidation, hydrogen peroxide (H2O2) content,
and cell membrane injury increased with increasing salinity levels with different degrees among the
landraces. Salt stress increased the sodium (Na+) accumulation coupled with a decrease in leaf
potassium (K+) depending on salinity levels. The analysis of variance showed significant effects of
salinity, landraces and their interactions in all studied parameters. The landraces were ranked for
salt tolerance indexes, and cluster group ranking ordered landraces from tolerant to sensitive and
their properties for salt stress tolerance are open for further research.
Key
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