Open AccessJournal Article
Growth and Stomatal Responses of Bread Wheat Genotypes in Tolerance to Salt stress
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TLDR
Stomatal conductance can be a reliable indicator of growth rate, and finally can be considered as a sensitive indicator of the osmotic stress after 20 days after salinity, it seems.Abstract:
Plant growth is affected by the osmotic stress as well as toxicity of salt in leaves. In order to study of salt stress effects on stomatal conductance and growth rate and relationship between them as wells osmotic and Na-specific effects on these traits, four bread wheat genotypes differing in salt tolerance were selected. Salinity was applied when the leaf 4 was fully expanded. Sodium (Na) concentrations in flag leaf blade at 3 salinity levels (0, 100 and 200 mM NaCl) were measured. Salt-tolerant genotypes showed higher stomatal conductance and growth rate compared to salt-sensitive ones. After 10 and 20 days exposure to salt, stomatal conductance and relative growth rate were reduced, but the reduction was greater in sensitive genotypes. Growth rate was reduced severely in the first period (1-10 days) of salt commencements and it was due to osmotic effect of salt not Na toxicity. In the second period (11-20 days) after salt treatment growth reduced only when salt accumulated to toxic concentrations in the leaves. A positive relationship between stomatal conductance and relative growth rate showed that stomatal conductance can be a reliable indicator of growth rate, and finally can be considered as a sensitive indicator of the osmotic stress. It seems 20 days after salinity, the major effect of salt, especially at low to moderate salinity levels on growth properties was due to the osmotic effect of salt, not to Na-specific effects within the plant. Keywords—Osmotic stress, Relative growth rate, Stomatal conductance, Wheat.read more
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References
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Journal ArticleDOI
Mechanisms of salinity tolerance
Rana Munns,Mark Tester +1 more
TL;DR: The physiological and molecular mechanisms of tolerance to osmotic and ionic components of salinity stress are reviewed at the cellular, organ, and whole-plant level and the role of the HKT gene family in Na(+) exclusion from leaves is increasing.
Journal ArticleDOI
Comparative physiology of salt and water stress
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Journal ArticleDOI
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TL;DR: A recently discovered halophytic plant species, Thellungiella halophila, now promises to help in the detection of new tolerance determinants and operating pathways in a model system that is not limited to Arabidopsis traits or ecotype variations.
Journal ArticleDOI
Physiological processes limiting plant growth in saline soils: some dogmas and hypotheses
TL;DR: It is argued that salts taken up by the plant do not directly control plant growth by affecting turgor, photosynthesis or the activity of any one enzyme, and rather, the build-up of salt in old leaves hasten their death, and the loss of these leaves affects the supply of assimilates or hormones to the growing regions and thereby affects growth.
Journal ArticleDOI
Tolerance of pea (Pisum sativum L.) to long‐term salt stress is associated with induction of antioxidant defences
TL;DR: The data strongly suggest that induction of antioxidant defences is at least one component of the tolerance mechanism of peas to long-term salt-stress.
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