A key factor determining the salt tolerance of wheatspecies is their genetic makeup. There is a high rate ofvariation in salt tolerance of the members of Triticeaeand some of the species are even halophytes. It is possibleto use the wild species for the production ofsalinity tolerant wheat species. The reduced concentrationof Naþ in tissues and a high Kþ/Naþ ratio areamong the favorable traits of the improved species. Themechanisms of Naþ exclusion in durum, bread and wildspecies of wheat have been indicated. Halophyte speciesare also able to exclude Cl. Accordingly, byhybridizing wild species with durum and bread wheat,salt-tolerant progenitors have been produced. It hasbeen demonstrated that several sources of Naþ exclusionreside on alternate chromosomes of differentwheat species. As a result, the determination of tolerancegenes and mechanisms, which may contribute towheat salt stress tolerance, is of significance [13,58].Singh et al. [93] calculated the salinity tolerance indicesfor wheat and determined the most tolerant genotypes,which can be used for breeding purposes.
A key factor determining the salt tolerance of wheat<br>species is their genetic makeup. There is a high rate of<br>variation in salt tolerance of the members of Triticeae<br>and some of the species are even halophytes. It is possible<br>to use the wild species for the production of<br>salinity tolerant wheat species. The reduced concentration<br>of Naþ in tissues and a high Kþ/Naþ ratio are<br>among the favorable traits of the improved species. The<br>mechanisms of Naþ exclusion in durum, bread and wild<br>species of wheat have been indicated. Halophyte species<br>are also able to exclude Cl. Accordingly, by<br>hybridizing wild species with durum and bread wheat,<br>salt-tolerant progenitors have been produced. It has<br>been demonstrated that several sources of Naþ exclusion<br>reside on alternate chromosomes of different<br>wheat species. As a result, the determination of tolerance<br>genes and mechanisms, which may contribute to<br>wheat salt stress tolerance, is of significance [13,58].<br>Singh et al. [93] calculated the salinity tolerance indices<br>for wheat and determined the most tolerant genotypes,<br>which can be used for breeding purposes.
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