NDLI: Nitrate assimilation in the forage legume Lotus japonicus L.

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Planta : Volume 223, Issue 3, February 2006

Planta : Volume 223, Issue 2, January 2006

Planta : Volume 223, Issue 1, December 2005

Nitrate assimilation in the forage legume Lotus japonicus L.

Content Provider	Springer Nature Link
Author	Prosser, Ian M. Massonneau, Agnes Smyth, Audra J. Waterhouse, Rosi N. Forde, Brian G. Clarkson, David T.
Copyright Year	2005
Abstract	Nitrate assimilation in the model legume, Lotus japonicus, has been investigated using a variety of approaches. A gene encoding a nitrate-inducible nitrate reductase (NR) has been cloned and appears to be the only NR gene present in the genome. Most of the nitrate reductase activity (NRA) is found in the roots and the plant assimilates the bulk of its nitrogen in that tissue. We calculate that the observed rates of nitrate reduction are compatible with the growth requirement for reduced nitrogen. The NR mRNA, NRA and the nitrate content do not show a strong diurnal rhythm in the roots and assimilation continues during the dark period although export of assimilated N to the shoot is lower during this time. In shoots, the previous low NR activity may be further inactivated during the dark either by a phosphorylation mechanism or due to reduced nitrate flux coincident with a decreased delivery through the transpiration stream. From nitrate-sufficient conditions, the removal of nitrate from the external medium causes a rapid drop in hydraulic conductivity and a decline in nitrate and reduced-N export. Root nitrate content, NR and nitrate transporter (NRT2) mRNA decline over a period of 2 days to barely detectable levels. On resupply, a coordinated increase of NR and NRT2 mRNA, and NRA is seen within hours.
Starting Page	821
Ending Page	834
Page Count	14
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	223
Issue Number	4
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-10-01
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Diurnal Legume Lotus Nitrate assimilation Nitrate reductase Nutrient deprivation
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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