NDLI: Influx, efflux and net uptake of nitrate in Quercus suber seedlings

Content Provider	Springer Nature Link
Author	Mata, Catarina van Vemde, Nicole Clarkson, David T. Martins Loução, Maria Amélia Lambers, Hans
Copyright Year	2000
Abstract	Nitrate influx, efflux and net nitrate uptake were measured for the slow-growing Quercus suber L. (cork-oak) to estimate the N-uptake efficiency of its seedlings when grown with free access to nitrate. We hypothesise that nitrate influx, an energetically costly process, is not very efficiently controlled so as to avoid losses through efflux, because Q. suber has relatively high respiratory costs for ion uptake. Q. suber seedlings were grown in a growth room in hydroponics with 1 mM NO$_{3}$ $^{-}$. Seedlings were labelled with $^{15}$NO$_{3}$ $^{-}$ in nutrient solution for 5 min to measure influx and for 2 h for net uptake. Efflux was calculated as the difference between influx and net uptake. Measurements were made in the morning, afternoon and night. The site of nitrate reduction was estimated from the ratio of NO$_{3}$ $^{-}$ to amino acids in the xylem sap; the observed ratio indicated that nitrate reduction occurred predominantly in the roots. Nitrate influx was always much higher than net acquisition and both tended to be lower at night. High efflux occurred both during the day and at night, although the proportion of $^{15}$NO$_{3}$ $^{-}$ taken up that was loss through efflux was proportionally higher during the night. Efflux was a significant fraction of influx. We concluded that the acquisition system is energetically inefficient under the conditions tested.
Starting Page	25
Ending Page	32
Page Count	8
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	221
Issue Number	1
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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