Loci controlling nitrate reductase activity in maize: ultraviolet-B signaling in aerial tissues increases nitrate reductase activity in leaf and root when responsive alleles are present.

Abstract excerpt

Environmental factors, such as ultraviolet-B (UV-B) irradiation, have the ability to affect pathways such as nitrogen metabolism. As fixed nitrogen is the keystone mineral nutrient that controls grain crop yield, any alteration in this cycle can be detrimental to plant productivity. Nitrate reductase enzyme activity is responsible for the reduction of nitrate to nitrite, and nitrate is the major form of nitrogen...

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