Spatial aluminium sensitivity of root apices of two common bean (Phaseolus vulgaris L.) genotypes with contrasting aluminium resistance

Simple item page
cg.creator.identifierIdupulapati M. Rao: 0000-0002-8381-9358
cg.identifier.doihttps://doi.org/10.1093/jxb/erm241en
cg.isijournalISI Journalen
cg.issn1460-2431en
cg.issue14en
cg.journalJournal of Experimental Botanyen
cg.reviewStatusPeer Reviewen
cg.subject.ciatBEANSen
cg.subject.ciatGENETIC RESOURCESen
cg.volume58en
dc.contributor.authorRangel Becerra, Andrés Felipeen
dc.contributor.authorRao, Idupulapati M.en
dc.contributor.authorHorst, Walter J.en
dc.date.accessioned2014-10-02T08:33:17Zen
dc.date.available2014-10-02T08:33:17Zen
dc.identifier.urihttps://hdl.handle.net/10568/44123
dc.titleSpatial aluminium sensitivity of root apices of two common bean (Phaseolus vulgaris L.) genotypes with contrasting aluminium resistanceen
dcterms.abstractThe initial response of plants to aluminium (Al) is an inhibition of root elongation. In the present study, short and medium-term effects of Al treatment (20??M) on root growth and Al accumulation of two common bean (Phaseolus vulgaris L.) genotypes, VAX-1 (Al-sensitive) and Quimbaya (Al-resistant), were studied. Root elongation of both genotypes was severely inhibited during the first 3 4?h of Al treatment. Thereafter, both genotypes showed gradual recovery. However, this recovery continued in genotype Quimbaya until the root elongation rate reached the level of the control (without Al) while the genotype VAX-1 was increasingly damaged by Al after 12?h of Al treatment. Short-term Al treatment (90??M Al) to different zones of the root apex using agarose blocks corroborated the importance of the transition zone (TZ, 1 2?mm) as a main target of Al. However, Al applied to the elongation zone (EZ) also contributed to the overall inhibition of root elongation. Enhanced inhibition of root elongation during the initial 4?h of Al treatment was related to high Al accumulation in root apices in both genotypes (Quimbaya>VAX-1). Recovery from Al stress was reflected by decreasing Al contents especially in the TZ, but also in the EZ. After 24?h of Al treatment the high Al resistance of Quimbaya was reflected by much lower Al contents in the entire root apex. The results confirmed that genotypic differences in Al resistance in common bean are built up during medium-term exposure of the roots to Al. For this acquisition of Al resistance, the activation and maintenance of an Al exclusion mechanism, especially in the TZ but also in the EZ, appears to be decisive.en
dcterms.accessRightsOpen Access
dcterms.extentpp. 3895-3904en
dcterms.issued2007-11-01
dcterms.languageen
dcterms.publisherOxford University Pressen
dcterms.subjectphaseolus vulgarisen
dcterms.subjectgenotypesen
dcterms.subjectstressen
dcterms.subjectsoil toxicityen
dcterms.subjectaluminiumen
dcterms.subjecttoleranceen
dcterms.subjectgenotiposen
dcterms.subjectestrésen
dcterms.subjecttoxicidad del sueloen
dcterms.subjectaluminioen
dcterms.subjecttoleranciaen
dcterms.typeJournal Article

Files

Collections

CIAT Articles in Journals