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Abstract
Reduced hydraulic conductance calculated from growth data was suggested to be the main reason for reduced leaf expansion in salt-stressed Chloris gayana (Rhodes grass). In this work, xylem vessel cross-sections and wall enzyme activities were analysed to re-examine the effects of salinity on leaf growth in this species. Maximal segmental growth rates were 20% lower and the growth zone was 23% shorter in leaves from salinized plants than in controls; [ver mas...]
dc.contributor.authorOrtega, Leandro Ismael
dc.contributor.authorFry, Stephen C.
dc.contributor.authorTaleisnik, Edith
dc.date.accessioned2020-06-22T13:01:06Z
dc.date.available2020-06-22T13:01:06Z
dc.date.issued2006-11
dc.identifier.issn0022-0957
dc.identifier.issn1460-2431
dc.identifier.otherhttps://doi.org/10.1093/jxb/erl168
dc.identifier.urihttp://hdl.handle.net/20.500.12123/7449
dc.identifier.urihttps://academic.oup.com/jxb/article/57/14/3945/587712
dc.description.abstractReduced hydraulic conductance calculated from growth data was suggested to be the main reason for reduced leaf expansion in salt-stressed Chloris gayana (Rhodes grass). In this work, xylem vessel cross-sections and wall enzyme activities were analysed to re-examine the effects of salinity on leaf growth in this species. Maximal segmental growth rates were 20% lower and the growth zone was 23% shorter in leaves from salinized plants than in controls; however, growth rates between 0 mm and 15 mm from the ligule were similar in both types of leaves. Xylem cross-sectional areas in this region were about 65% smaller in leaves of salinized plants, suggesting that hydraulic restrictions in the leaves of salinized plants were much higher than overall growth reductions. Extractable xyloglucan endotransglucosylase activity in this zone was twice as high in leaves of salinized plants as in leaves of controls. Nevertheless, the activity of the extracted enzyme was not affected by up to 1 M NaCl added to the reaction medium. Therefore, increased xyloglucan endotransglucosylase activity under salinity may be due to a promotion of transcription of XTH (xyloglucan endotransglucosylase/hydrolases) genes and/or translation of preformed transcripts. These results suggest that, as in drought stress, increased activity of cell wall enzymes associated with wall loosening may contribute to the maintenance of growth under saline conditions despite hydraulic restrictions.eng
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherSociety for Experimental Biologyes_AR
dc.rightsinfo:eu-repo/semantics/openAccesses_AR
dc.sourceJournal of Experimental Botany 57 (14) : 3945–3952. (November 2006)es_AR
dc.subjectChloris gayanaes_AR
dc.subjectPeroxídasases_AR
dc.subjectPeroxidaseseng
dc.subjectEstrés Osmóticoes_AR
dc.subjectOsmotic Stresseng
dc.subjectXilemaes_AR
dc.subjectXylemeng
dc.subject.otherGrama Rhodeses_AR
dc.subject.otherRhodes Grasseng
dc.subject.otherEstrés Salinoes_AR
dc.titleWhy are Chloris gayana leaves shorter in salt-affected plants? Analyses in the elongation zonees_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenInstituto de Fisiología y Recursos Genéticos Vegetaleses_AR
dc.description.filFil: Ortega, Leandro Ismael. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Fisiología y Recursos Genéticos Vegetales (ex IFFIVE); Argentinaes_AR
dc.description.filFil: Fry, Stephen C. University of Edinburgh. Institute of Molecular Plant Sciences. The Edinburgh Cell Wall Group; Gran Bretañaes_AR
dc.description.filFil: Taleisnik, Edith. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Fisiología y Recursos Genéticos Vegetales (ex IFFIVE); Argentina.es_AR
dc.subtypecientifico


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