Alteration of cell-wall porosity is involved in osmotic stress-induced enhancement of aluminium resistance in common bean (Phaseolus vulgaris L.)

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dc.identifier.uri http://dx.doi.org/10.15488/463
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/486
dc.contributor.author Yang, Zhong-Bao
dc.contributor.author Eticha, Dejene
dc.contributor.author Rao, Idupulapati Madhusudana
dc.contributor.author Horst, Walter Johannes
dc.date.accessioned 2016-08-30T10:20:24Z
dc.date.available 2016-08-30T10:20:24Z
dc.date.issued 2010-07
dc.identifier.citation Yang, Zhong-Bao; Eticha, Dejene; Rao, Idupulapati Madhusudana; Horst, Walter Johannes: Alteration of cell-wall porosity is involved in osmotic stress-induced enhancement of aluminium resistance in common bean (Phaseolus vulgaris L.). In: Journal of Experimental Botany 61 (2010), Nr. 12 , S. 3245-3258. DOI: http://dx.doi.org/10.1093/jxb/erq146
dc.description.abstract Aluminium (Al) toxicity and drought are the two major abiotic stress factors limiting common bean production in the tropics. Using hydroponics, the short-term effects of combined Al toxicity and drought stress on root growth and Al uptake into the root apex were investigated. In the presence of Al stress, PEG 6000 (polyethylene glycol)-induced osmotic (drought) stress led to the amelioration of Al-induced inhibition of root elongation in the Al-sensitive genotype VAX 1. PEG 6000 (>> PEG 1000) treatment greatly decreased Al accumulation in the 1 cm root apices even when the roots were physically separated from the PEG solution using dialysis membrane tubes. Upon removal of PEG from the treatment solution, the root tips recovered from osmotic stress and the Al accumulation capacity was quickly restored. The PEG-induced reduction of Al accumulation was not due to a lower phytotoxic Al concentration in the treatment solution, reduced negativity of the root apoplast, or to enhanced citrate exudation. Also cell-wall (CW) material isolated from PEG-treated roots showed a low Al-binding capacity which, however, was restored after destroying the physical structure of the CW. The comparison of the Al(3+), La(3+), Sr(2+), and Rb(+) binding capacity of the intact root tips and the isolated CW revealed the specificity of the PEG 6000 effect for Al. This could be due to the higher hydrated ionic radius of Al(3+) compared with other cations (Al(3+) >> La(3+) > Sr(2+) > Rb(+)). In conclusion, the results provide circumstantial evidence that the osmotic stress-inhibited Al accumulation in root apices and thus reduced Al-induced inhibition of root elongation in the Al-sensitive genotype VAX 1 is related to the alteration of CW porosity resulting from PEG 6000-induced dehydration of the root apoplast. eng
dc.description.sponsorship BMZ/GTZ/05.7860.9-001.00
dc.language.iso eng
dc.publisher Oxford : Oxford Univ. Press
dc.relation.ispartofseries Journal of Experimental Botany 61 (2010), Nr. 12
dc.rights CC BY-NC 2.5
dc.rights.uri https://creativecommons.org/licenses/by-nc/2.5/
dc.subject aluminium eng
dc.subject apoplast eng
dc.subject drought stress eng
dc.subject intercellular space eng
dc.subject organic acids eng
dc.subject polyethylene glycol eng
dc.subject root elongation eng
dc.subject low water potentials eng
dc.subject triticum-aestivum l eng
dc.subject apical root-zone eng
dc.subject drought tolerance eng
dc.subject abscisic-acid eng
dc.subject pore-size eng
dc.subject polyethylene glycol-6000 eng
dc.subject pectin methylesterase eng
dc.subject nutrient solution eng
dc.subject soybean roots eng
dc.subject.ddc 500 | Naturwissenschaften ger
dc.title Alteration of cell-wall porosity is involved in osmotic stress-induced enhancement of aluminium resistance in common bean (Phaseolus vulgaris L.)
dc.type article
dc.type Text
dc.relation.issn 0022-0957
dc.relation.doi http://dx.doi.org/10.1093/jxb/erq146
dc.bibliographicCitation.issue 12
dc.bibliographicCitation.volume 61
dc.bibliographicCitation.firstPage 3245
dc.bibliographicCitation.lastPage 3258
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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