Nitrogen Assimilation in the Highly Salt- and Boron-Tolerant Ecotype Zea mays L. Amylacea

Plants
Teresa Fuertes-MendizábalMª Begoña González-Moro

Abstract

The Lluta Valley in Northern Chile is an important agricultural area affected by both salinity and boron (B) toxicity. Zea mays L. amylacea, an ecotype arisen because of the seed selection practiced in this valley, shows a high tolerance to salt and B levels. In the present study the interaction between B and salt was studied after 20 days of treatment at low (100 mM) and high salinity (430 mM NaCl), assessing changes in nitrogen metabolites and in the activity of key nitrogen-assimilating enzymes. Under non-saline conditions, the presence of excessive B favored higher nitrate and ammonium mobilization to leaves, increasing nitrate reductase (NR) activity but not glutamine synthetase (GS). Thus, the increment of nitrogen use efficiency by B application would contribute partially to maintain the biomass production in this ecotype. Positive relationships between NR activity, nitrate, and stomatal conductance were observed in leaves. The increment of major amino acids alanine and serine would indicate a photoprotective role of photorespiration under low-salinity conditions, thus the inhibition of nitrogen assimilation pathway (NR and GS activities) occurred only at high salinity. The role of cytosolic GS regarding the proline accu...Continue Reading

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Citations

Dec 3, 2020·International Journal of Molecular Sciences·Stanislav IsayenkovVolodymyr Radchuk
Apr 4, 2021·International Journal of Molecular Sciences·Dung Minh Ha-TranChieh-Chen Huang
Jul 3, 2021·Plants·Fernando de la Torre, Concepción Ávila

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Methods Mentioned

BETA
ion exchange chromatography
Protein Blot

Software Mentioned

SPSS

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