The spatial distribution of phosphate in the root system modulates N metabolism and growth in <i>Eucalyptus grandis</i> young plants

High P homogeneously applied in roots reduced growth and nitrate uptake. High P in a patch reduced N in tissues but did not reduce growth, because root hydraulic conductivity increased.; Little is known about consequences of nutrient imbalances, i.e., when the increase of one nutrient’s availabilit...

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Detalles Bibliográficos
Autores principales: Costa, Lorenza, Faustino, Laura Inés, Graciano, Corina
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Agrarias
Nutrient interaction
Hydraulic conductivity
Mineral nutrition
Low nitrate
Localized phosphate
Homogeneous phosphate
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/145011
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-145011
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Agrarias
Nutrient interaction
Hydraulic conductivity
Mineral nutrition
Low nitrate
Localized phosphate
Homogeneous phosphate
spellingShingle Ciencias Agrarias
Nutrient interaction
Hydraulic conductivity
Mineral nutrition
Low nitrate
Localized phosphate
Homogeneous phosphate
Costa, Lorenza
Faustino, Laura Inés
Graciano, Corina
The spatial distribution of phosphate in the root system modulates N metabolism and growth in <i>Eucalyptus grandis</i> young plants
topic_facet Ciencias Agrarias
Nutrient interaction
Hydraulic conductivity
Mineral nutrition
Low nitrate
Localized phosphate
Homogeneous phosphate
description High P homogeneously applied in roots reduced growth and nitrate uptake. High P in a patch reduced N in tissues but did not reduce growth, because root hydraulic conductivity increased.; Little is known about consequences of nutrient imbalances, i.e., when the increase of one nutrient’s availability, in non-toxic concentration, reduces plant growth, because other nutrient availability is low. In a soil with low N (nitrogen) availability, high homogeneous P (phosphorus) availability reduced nitrate uptake and reduced growth of Eucalyptus grandis plants. However, if the same availability of P was applied only in a part of the root system (localized), no depressive effect was observed. In this work, it was analyzed which step in the early assimilation of N was affected by high homogeneous P and how localized P counteracted this depressive effect. Inorganic forms of N and protein in plant tissues as well as some plant hydraulic traits were analyzed in an experiment with E. grandis plants growing in perlite in a split-root system fed with low N. Control plants received low P. High P was applied in two spatial distributions: localized in one part of the root system (LP) or distributed homogeneously in both parts (HP). HP reduced growth, while LP had no depressive effect in growth. Both high P spatial distributions reduced concentration of nitrate in roots. Since concentration of nitrate in the xylem was similar in all treatments and nitrate in leaves was lower in high P than in control treatment, the reduction in root N was probably due to lower uptake. Nevertheless, plants growing with LP had no depressive effect in growth, because the decrease in N assimilation was counteracted by an increase of root hydraulic conductivity.
format Articulo
Articulo
author Costa, Lorenza
Faustino, Laura Inés
Graciano, Corina
author_facet Costa, Lorenza
Faustino, Laura Inés
Graciano, Corina
author_sort Costa, Lorenza
title The spatial distribution of phosphate in the root system modulates N metabolism and growth in <i>Eucalyptus grandis</i> young plants
title_short The spatial distribution of phosphate in the root system modulates N metabolism and growth in <i>Eucalyptus grandis</i> young plants
title_full The spatial distribution of phosphate in the root system modulates N metabolism and growth in <i>Eucalyptus grandis</i> young plants
title_fullStr The spatial distribution of phosphate in the root system modulates N metabolism and growth in <i>Eucalyptus grandis</i> young plants
title_full_unstemmed The spatial distribution of phosphate in the root system modulates N metabolism and growth in <i>Eucalyptus grandis</i> young plants
title_sort spatial distribution of phosphate in the root system modulates n metabolism and growth in <i>eucalyptus grandis</i> young plants
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/145011
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