The Effects of NaCl Treatment on Water Relations, Growth, and ABA Content in Barley Cultivars Differing in Drought Tolerance |
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Authors: | D S Veselov G V Sharipova S U Veselov G R Kudoyarova |
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Institution: | (1) Ufa Research Centre, Russian Academy of Sciences, pr. Octyabrya 69, Ufa, 450054, Russia;(2) Department of Plant Physiology of Biological Faculty, Bashkir State University, 450073 Ufa, Russia |
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Abstract: | Changes in transpiration and stomatal conductance and other characteristics of water relations, growth rate, and ABA content
have been followed in short- and long-term experiments in two barley cultivars (cv. Michaelovsky and cv. Prairie) with contrasting
drought resistance characteristics. The aim of this work was to reveal the importance of stomatal behavior in salt tolerance
and also the involvement of ABA in its control. Salinity stress brought about a reduction in stomatal conductance in both
cultivars, but the effect was initially more pronounced in the drought-tolerant cv. Prairie than in the drought-sensitive
cv. Michaelovsky. The difference between the two cultivars changed with time, and later on transpiration and stomatal conductance
became higher in Prairie than in Michaelovsky. In both the short and the long term, the extent of stomatal closure due to
salinity correlated with the level of ABA accumulation in the leaves of the plants. Fast stomatal closure was likely to be
responsible for growth resumption after an initial arrest by salt treatment and for the maintenance of extension growth later
on, thus enabling its higher rate in Prairie than in Michaelovsky plants. Leaves of Prairie accumulated less toxic chloride
ions, which may be the result of a lower transpiration rate observed during the first phase of salt treatment. A subsequent
increase in stomatal conductance observed in Prairie is likely to ameliorate their gas exchange and maintain photosynthesis
and growth. Thus, differences between the cultivars in the stomatal response to salinity changed with time, which may be why
there are discrepancies in the attempts to relate stomatal conductance to salt tolerance observed in literature. |
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Keywords: | Hordeum vulgare Salinity Salt resistance Barley cultivars ABA Transpiration Stomatal conductivity Growth |
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