Effects of soil drying and subsequent re-watering on the activity of nitrate reductase in roots and leaves of Helianthus annuus

Functional Plant Biology : FPB
João Azedo-SilvaMaria João Correia

Abstract

The effects of drought on the activity of nitrate reductase (NR) were studied in Helianthus annuus L. plants subjected to soil drying and subsequent re-watering. Drought did not negatively affect the activation state of NR, but resulted in linearly-correlated decreases in the activity of the unphosphorylated active form and the total activity of NR, in both roots and leaves. The concentration of nitrate in roots, xylem and leaves also decreased in water-stressed plants, whereas the concentration of total amino acids was only transiently depressed at the leaf level. In contrast, soluble sugars accumulated both in roots and leaves of water-stressed plants. Drought-induced decreases in root NR activity were correlated with the observed changes in root nitrate concentration. A higher percentage of the decrease in foliar NR activity could be explained by the decline in nitrate flux to the leaves than by leaf nitrate content. Following re-watering, the extent of recovery of NR activity was higher in roots than in leaves. The delay in the recovery of foliar NR activity did not result from the persistence of reduced flux of nitrate through the xylem. Several hypotheses to explain the after-effect of soil drying on foliar NR activity ar...Continue Reading

References

Jul 1, 1995·The Plant Cell·N M Crawford
Jul 4, 2001·Journal of Experimental Botany·C Stöhr, G Mäck
Mar 26, 2002·Journal of Experimental Botany·Mark StittAnne Krapp
Sep 1, 1977·Plant Physiology·M G JonesO H Lowry
Jul 1, 1990·Plant Physiology·D M Long, A Oaks
Apr 1, 2002·Functional Plant Biology : FPB·Purificación PajueloAntonio J Márquez

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Citations

Oct 4, 2015·Environmental Science and Pollution Research International·Rana Nauman ShabbirZ Ahmad
Jan 12, 2021·Frontiers in Plant Science·Vít GloserChristoph Martin Geilfus

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