NDLI: Influence of inorganic nitrogen sources on K$^{+}$/Na$^{+}$ homeostasis and salt tolerance in sorghum plants

Content Provider	SpringerLink
Author	Miranda, Rafael de Souza Alvarez Pizarro, Juan Carlos Araújo, Celso Marines Silva Prisco, José Tarquinio Gomes Filho, Enéas
Copyright Year	2012
Abstract	This work aimed to study the regulation of K$^{+}$/Na$^{+}$ homeostasis and the physiological responses of salt-treated sorghum plants [Sorghum bicolor (L.) Moench] grown with different inorganic nitrogen (N) sources. Four days after sowing (DAS), the plants were transferred to complete nutrient solutions containing 0.75 mM K$^{+}$ and 5 mM N, supplied as either NO$_{3}$ $^{−}$ or NH$_{4}$ $^{+}$. Twelve DAS, the plants were subjected to salt stress with 75 mM NaCl, which was applied in two doses of 37.5 mM. The plants were harvested on the third and seventh days after the exposure to NaCl. Under the salt stress conditions, the reduction of K$^{+}$ concentrations in the shoot and roots was higher in the culture with NO$_{3}$ $^{−}$ than with NH$_{4}$ $^{+}$. However, the more conspicuous effect of N was on the Na$^{+}$ accumulation, which was severely limited in the presence of NH$_{4}$ $^{+}$. This ionic regulation had a positive influence on the K$^{+}$/Na$^{+}$ ratio and the selective absorption and transport of K$^{+}$ in the plants grown with NH$_{4}$ $^{+}$. Under control and salt stress conditions, higher accumulation of free amino acids and soluble proteins was promoted in NH$_{4}$ $^{+}$ grown roots than NO$_{3}$ $^{−}$ grown roots at both harvesting time, whereas higher accumulation of soluble sugars was observed only at 7 days of salt stress exposure. Unlike the NH$_{4}$ $^{+}$ grown plants, the gas exchanges of the NO$_{3}$ $^{−}$ grown plants were reduced after 7 days of salt stress. These results suggest that external NH$_{4}$ $^{+}$ may limit Na$^{+}$ accumulation in sorghum, which could contribute to improving its physiological and metabolic responses to salt stress.
Starting Page	841
Ending Page	852
Page Count	12
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	35
Issue Number	3
e-ISSN	18611664
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-11-04
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Inorganic nitrogen K$^{+}$/Na$^{+}$ homeostasis Salinity Sorghum bicolor Plant Physiology Plant Genetics & Genomics Plant Biochemistry Plant Pathology Plant Anatomy/Development Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Physiology Plant Science

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