OrangerV1, Main, Exploration, bibRecord, 002E08

Responses of "Newhall" orange trees to iron deficiency in hydroponics : Effects on leaf chlorophyll, photosynthetic efficiency, and root ferric chelate reductase activity

Identifieur interne : 002E08 ( Main/Exploration ); précédent : 002E07; suivant : 002E09

Responses of "Newhall" orange trees to iron deficiency in hydroponics : Effects on leaf chlorophyll, photosynthetic efficiency, and root ferric chelate reductase activity

Auteurs : Maribela Pestana [Portugal] ; Manuela David [Portugal] ; Amarilis De Varennes [Portugal] ; Javier Abadia [Espagne] ; Eugénio Araujo Faria [Portugal]

Source :

Journal of plant nutrition [ 0190-4167 ] ; 2001.

RBID : Pascal:03-0026028

Descripteurs français

Pascal (Inist)
- Activité enzymatique, Chlorose ferrique, Composition chimique, Photosynthèse, Modalité réponse, Feuille végétal, Racine, Cultivar, Citrus sinensis, Chlorophylle, Fer, Ferric-chelate reductase, Etude en serre, Culture hydroponique, Absorption, Biodisponibilité, Concentration chimique, Echange gazeux, Fluorescence, Oxydoréduction, Transport membranaire, Trouble nutrition, Membrane plasmique, Photosystème 2, Facteur influence, Facteur milieu, Facteur édaphique, Calcium carbonate, Oxygène?Molécule, Solution nutritive, Sol calcaire, Sol de verger, Simulation physique.
Wicri :
- topic : Fer.

English descriptors

KwdEn :
- Chemical composition, Chlorophyll, Citrus sinensis, Cultivar, Enzymatic activity, Ferric-chelate reductase, Greenhouse study, Hydroponic cultivation, Iron, Iron chlorosis, Photosynthesis, Plant leaf, Response modality, Root.

Abstract

Orange (Citrus sinensis L. Osb. cv. 'Newhall') plants grafted on Citrange troyer rootstock were grown in nutrient solution with 0, 5, 10, or 20 μM iron (Fe), with and without calcium carbonate. Calcium carbonate was added in order to mimic the natural conditions in calcareous soils. Leaf chlorophyll concentration was estimated every 3-4 days using the portable instrument SPAD-502 meter. Chlorophyll fluorescence parameters, photosynthetic capacity estimated from oxygen evolution, leaf Fe concentrations, and root tip ferric chelate reductase activity were measured at the end of the experiment. Plants from the 0 and 5 μM Fe treatments showed leaf chlorosis and had decreased leaf chlorophyll concentrations. Leaves of plants grown in the absence of Fe in the solution had smaller rates of oxygen evolution both in the presence and absence of calcium carbonate, compared with plants grown in the presence of 10 μM Fe. In the absence of calcium carbonate the photosystem II efficiency, estimated from fluorescence parameters, was similar in all treatments. A slight decrease in photosystem II efficiency was observed in plants grown without Fe and in the presence of calcium carbonate. A 2.5-fold increase in root tip ferric chelate reductase activity over the control values was found only when plants were grown with low levels of Fe and in the presence of calcium carbonate.

Affiliations:

Espagne, Portugal
Aragon

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Orange (Citrus sinensis L. Osb. cv. 'Newhall') plants grafted on Citrange troyer rootstock were grown in nutrient solution with 0, 5, 10, or 20 μM iron (Fe), with and without calcium carbonate. Calcium carbonate was added in order to mimic the natural conditions in calcareous soils. Leaf chlorophyll concentration was estimated every 3-4 days using the portable instrument  SPAD-502 meter. Chlorophyll fluorescence parameters, photosynthetic capacity estimated from oxygen evolution, leaf Fe concentrations, and root tip ferric chelate reductase activity were measured at the end of the experiment. Plants from the 0 and 5 μM Fe treatments showed leaf chlorosis and had decreased leaf chlorophyll concentrations. Leaves of plants grown in the absence of Fe in the solution had smaller rates of oxygen evolution both in the presence and absence of calcium carbonate, compared with plants grown in the presence of 10 μM Fe. In the absence of calcium carbonate the photosystem II efficiency, estimated from fluorescence parameters, was similar in all treatments. A slight decrease in photosystem II efficiency was observed in plants grown without Fe and in the presence of calcium carbonate. A 2.5-fold increase in root tip ferric chelate reductase activity over the control values was found only when plants were grown with low levels of Fe and in the presence of calcium carbonate.</div>
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Responses of "Newhall" orange trees to iron deficiency in hydroponics : Effects on leaf chlorophyll, photosynthetic efficiency, and root ferric chelate reductase activity

Responses of "Newhall" orange trees to iron deficiency in hydroponics : Effects on leaf chlorophyll, photosynthetic efficiency, and root ferric chelate reductase activity

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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