The spatial distribution of phosphate in the root system modulates N metabolism and growth in Eucalyptus grandis young plants
| Autor: | Laura Inés Faustino, M.lorenza Costa, Corina Graciano |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
0301 basic medicine Physiology Nutrient interaction Hydraulic conductivity Mineral nutrition Localized phosphate NUTRIENT INTERACTION chemistry.chemical_element Plant Science Root system 01 natural sciences MINERAL NUTRITION 03 medical and health sciences chemistry.chemical_compound Nutrient Nitrate LOCALIZED PHOSPHATE HOMOGENEOUS PHOSPHATE Ciencias Agrarias Ecology Agricultura Phosphorus HYDRAULIC CONDUCTIVITY Xylem Plant physiology Forestry Phosphate LOW NITRATE Horticulture 030104 developmental biology chemistry Agronomy CIENCIAS AGRÍCOLAS Homogeneous phosphate purl.org/becyt/ford/4.1 [https] Agricultura Silvicultura y Pesca Low nitrate purl.org/becyt/ford/4 [https] 010606 plant biology & botany |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| ISSN: | 1432-2285 0931-1890 |
| DOI: | 10.1007/s00468-016-1480-8 |
| Popis: | 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. Instituto de Fisiología Vegetal |
| Databáze: | OpenAIRE |
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