Screening the tolerance of Romanian and Sweeden willow hybrids to saline stress
Keywords:
Salix, NaCl tolerance, hydric stress, shoot dry mass index, root dry mass indexAbstract
Willows are deciduous trees and shrubs with more than 450 species worldwide. In Romania, the Danube Delta, the Danube Meadow, and all the other river meadows are areas occupied by willows but no more than 0.5% from the national forest fund. There are protection forests (water protection, stream bank protection, etc.) and production forests. In recent years, the interest in willow short rotation coppice increased, so many hybrids were evaluated for biomass production or phytoremediation. Willow species are known as high-demand water species. In this context, the response of willows to hydric stress is essential for marginal land afforestation. A hydroponic laboratory experiment with two factors, willow hybrids and NaCl concentration level, was initiated. Ten hybrids: seven Romanian hybrids (RO_892, RO_1077, RO_1082, Cozia, Fragisal, Pesred and Robisal) and three Sweden hybrids (Inger, Olof, Tordis) collected from the University of Life Sciences ”King Mihai I” from Timișoara and three concentration of NaCl level were tested. The tolerance of studied willow hybrids to saline stress was estimated according to the shoot dry mass index, root dry mass index, the ratio of shoot dry mass to root dry mass. The response of willow genotypes in terms of biomass index showed the tolerance for the first and second levels of NaCl in the case of genotypes RO1077, RO1082, Pesred and Inger. There was no resistance to the third level of NaCl.
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