Effects of a localized supply of nitrate on NO3- uptake rate and growth of roots in Lolium multiflorum Lam. View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1998-05

AUTHORS

P. Lainé, A. Ourry, J. Boucaud, J. Salette

ABSTRACT

Roots of higher plants are usually exposed to varying spatial and temporal changes in concentrations of soil mineral nitrogen. A split root system was used to see how Lolium multiflorum Lam. roots adapt to such variations to cope with their N requirements. Plants were grown in hydroponic culture with their root system split in two spatially separated compartments allowing them to be fed with or without KNO3. Net NO3- uptake, 15NO3- influx and root growth were studied in relation to time. Within less than 24 h following deprivation of KNO3 to half the roots, the influx in NO3- fed roots was observed to increase (about 200% of the influx measured in plant uniformly NO3- supplied control plant) thereby compensating the whole plant for the lack of uptake by the N deprived roots. Due to the large NO3- concentrations in the roots, the NO3- efflux was also increased so that the net uptake rate increased only slightly (35% maximum) compared with the values obtained for control plants uniformly supplied with NO3-. This increase in net NO3- uptake rate was not sufficient to compensate the deficit in N uptake rate of the NO3- deprived split root in the short term. Over a longer period (>1 wk), root growth of the part of the root system locally supplied with NO3- was stimulated. An increase in root growth was mainly responsable for the greater uptake of nitrate in Lolium multiflorum so that it was able to fully compensate the deficit in N uptake rate of the NO3- deprived split root. More... »

PAGES

61-67

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1004304415010

DOI

http://dx.doi.org/10.1023/a:1004304415010

DIMENSIONS

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