Aluminum resistance in common bean (Phaseolus vulgaris) involves induction and maintenance of citrate exudation from root apices

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cg.creator.identifierIdupulapati M. Rao: 0000-0002-8381-9358
cg.identifier.doihttps://doi.org/10.1111/j.1399-3054.2009.01303.xen
cg.isijournalISI Journalen
cg.issn0031-9317en
cg.issn1399-3054en
cg.issue2en
cg.journalPhysiologia Plantarumen
cg.reviewStatusPeer Reviewen
cg.subject.ciatBEANSen
cg.subject.ciatGENETIC RESOURCESen
cg.volume138en
dc.contributor.authorRangel Becerra, Andrés Felipeen
dc.contributor.authorRao, Idupulapati M.en
dc.contributor.authorBraun, HPen
dc.contributor.authorHorst, Walter J.en
dc.date.accessioned2014-09-24T08:41:43Zen
dc.date.available2014-09-24T08:41:43Zen
dc.identifier.urihttps://hdl.handle.net/10568/43168
dc.titleAluminum resistance in common bean (Phaseolus vulgaris) involves induction and maintenance of citrate exudation from root apicesen
dcterms.abstractTwo common bean (Phaseolus vulgaris L.) genotypes differing in aluminum (Al) resistance, Quimbaya (Al‐resistant) and VAX‐1 (Al‐sensitive) were grown in hydroponics for up to 25 h with or without Al, and several parameters related to the exudation of organic acids anions from the root apex were investigated. Al treatment enhanced the exudation of citrate from the root tips of both genotypes. However, its dynamic offers the most consistent relationship between Al‐induced inhibition of root elongation and Al accumulation in and exclusion from the root apices. Initially, in both genotypes the short‐term (4 h) Al‐injury period was characterized by the absence of citrate efflux independent of the citrate content of the root apices, and reduction of cytosolic turnover of citrate conferred by a reduced Nicotinamide adenine dinucleotide phosphate–isocitrate dehydrogenase (EC 1.1.1.42) activity. Transient recovery from initial Al stress (4–12 h) was found to be dependent mainly on the capacity to utilize internal citrate pools (Al‐resistant genotype Quimbaya) or enhanced citrate synthesis [increased activities of NAD‐malate dehydrogenase (EC 1.1.1.37) and ATP‐phosphofructokinase (EC 2.7.1.11) in Al‐sensitive VAX‐1]. Sustained recovery from Al stress through citrate exudation in genotype Quimbaya after 24 h Al treatment relied on restoring the internal citrate pool and the constitutive high activity of citrate synthase (CS) (EC 4.1.3.7) fuelled by high phosphoenolpyruvate carboxylase (EC 4.1.1.31) activity. In the Al‐sensitive genotype VAX‐1 the citrate exudation and thus Al exclusion and root elongation could not be maintained coinciding with an exhaustion of the internal citrate pool and decreased CS activity.en
dcterms.accessRightsLimited Access
dcterms.available2010-01-07
dcterms.extentpp. 176-190en
dcterms.issued2010-02
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherWileyen
dcterms.subjectphaseolus vularisen
dcterms.subjectrootsen
dcterms.subjectaluminiumen
dcterms.subjectanionsen
dcterms.subjectgenotypesen
dcterms.subjectcitratesen
dcterms.subjecthydroponicsen
dcterms.subjectraícesen
dcterms.subjectaluminioen
dcterms.subjectanionesen
dcterms.subjectgenotiposen
dcterms.subjectcitratosen
dcterms.subjectcultivo hidropónicoen
dcterms.typeJournal Article

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