Nitrate transport in cucumber leaves is an inducible process involving an increase in plasma membrane H⁺-ATPase activity and abundance.

BMC Plant Biology
Miroslav NikolicZeno Varanini

Abstract

The mechanisms by which nitrate is transported into the roots have been characterized both at physiological and molecular levels. It has been demonstrated that nitrate is taken up in an energy-dependent way by a four-component uptake machinery involving high- and low- affinity transport systems. In contrast very little is known about the physiology of nitrate transport towards different plant tissues and in particular at the leaf level. The mechanism of nitrate uptake in leaves of cucumber (Cucumis sativus L. cv. Chinese long) plants was studied and compared with that of the root. Net nitrate uptake by roots of nitrate-depleted cucumber plants proved to be substrate-inducible and biphasic showing a saturable kinetics with a clear linear non saturable component at an anion concentration higher than 2 mM. Nitrate uptake by leaf discs of cucumber plants showed some similarities with that operating in the roots (e.g. electrogenic H+ dependence via involvement of proton pump, a certain degree of induction). However, it did not exhibit typical biphasic kinetics and was characterized by a higher Km with values out of the range usually recorded in roots of several different plant species. The quantity and activity of plasma membrane (P...Continue Reading

References

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Jun 1, 2007·Functional Plant Biology : FPB·Miroslav NikolicRoberto Pinton

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Citations

Dec 30, 2014·Plant Physiology and Biochemistry : PPB·Youry PiiStefano Cesco
Feb 5, 2019·Journal of Experimental Botany·Youry PiiStefano Cesco
Oct 29, 2020·Plant Physiology and Biochemistry : PPB·Sebastian B FeilStefano Cesco

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Methods Mentioned

BETA
cLATS
PCR

Software Mentioned

SigmaStat
SPSS
Opticon Monitor
R
SigmaPlot
qPCR
Blastn
ImageJ

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