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Rootstock alleviates PEG-induced water stress in grafted pepper seedlings: physiological responses

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Rootstock alleviates PEG-induced water stress in grafted pepper seedlings: physiological responses

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dc.contributor.author Penella, Consuelo es_ES
dc.contributor.author González Nebauer, Sergio es_ES
dc.contributor.author San Bautista Primo, Alberto es_ES
dc.contributor.author López Galarza, Salvador Vicente es_ES
dc.contributor.author Calatayud Chover, Ángeles es_ES
dc.date.accessioned 2016-11-09T14:01:56Z
dc.date.available 2016-11-09T14:01:56Z
dc.date.issued 2014-06
dc.identifier.issn 0176-1617
dc.identifier.uri http://hdl.handle.net/10251/73694
dc.description.abstract [EN] Recent studies have shown that tolerance to abiotic stress, including water stress, is improved by grafting. In a previous work, we took advantage of the natural variability of Capsicum spp. and selected accessions tolerant and sensitive to water stress as rootstocks. The behavior of commercial cultivar 'Verset' seedlings grafted onto the selected rootstocks at two levels of water stress provoked by adding 3.5 and 7% PEG (polyethylene glycol) was examined over 14 days. The objective was to identify the physiological traits responsible for the tolerance provided by the rootstock in order to determine if the tolerance is based on the maintenance of the water relations under water stress or through the activation of protective mechanisms. To achieve this goal, various physiological parameters were measured, including: water relations; proline accumulation; gas exchange; chlorophyll fluorescence; nitrate reductase activity; and antioxidant capacity. Our results indicate that the effect of water stress on the measured parameters depends on the duration and intensity of the stress level, as well as the rootstock used. Under control conditions (0% PEG) all plant combinations showed similar values for all measured parameters. In general terms, PEG provoked a strong decrease in the gas exchange parameters in the cultivar grafted onto the sensitive accessions, as also observed in the ungrafted plants. This effect was related to lower relative water content in the plants, provoked by an inefficient osmotic adjustment that was dependent on reduced proline accumulation. At the end of the experiment, chronic photoinhibition was observed in these plants. However, the plants grafted onto the tolerant rootstocks, despite the reduction in photosynthetic rate, maintained the protective capacity of the photosynthetic machinery mediated by osmotic adjustment (based on higher proline content). In addition, water stress limited uptake and further NO3- transfer to the leaves. Increased nitrate reductase activity in the roots was observed, mainly in plants grafted onto the sensitive rootstocks, as well as the ungrafted plants, and this was associated with the lessened flux to the leaves. This study suggests that PEG-induced water stress can be partially alleviated by using tolerant accessions as rootstocks. (C) 2014 Elsevier GmbH. All rights reserved es_ES
dc.description.sponsorship This work was financed by INIA (Spain) through project RTA2010-00038-C01 and the European Regional Development Fund (ERDF). en_EN
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation INIA (Spain) RTA2010-00038-C01 es_ES
dc.relation European Regional Development Fund (ERDF) es_ES
dc.relation.ispartof Journal of Plant Physiology es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Graft es_ES
dc.subject Osmotic potential es_ES
dc.subject Pepper es_ES
dc.subject Photosynthesis es_ES
dc.subject Water stress es_ES
dc.subject.classification PRODUCCION VEGETAL es_ES
dc.subject.classification FISIOLOGIA VEGETAL es_ES
dc.subject.classification INGENIERIA NUCLEAR es_ES
dc.title Rootstock alleviates PEG-induced water stress in grafted pepper seedlings: physiological responses es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.jplph.2014.01.013
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Producción Vegetal - Departament de Producció Vegetal es_ES
dc.description.bibliographicCitation Penella, C.; González Nebauer, S.; San Bautista Primo, A.; López Galarza, SV.; Calatayud Chover, Á. (2014). Rootstock alleviates PEG-induced water stress in grafted pepper seedlings: physiological responses. Journal of Plant Physiology. 171(10):842-857. doi:10.1016/j.jplph.2014.01.013 es_ES
dc.description.accrualMethod Senia es_ES
dc.relation.publisherversion https://dx.doi.org/10.1016/j.jplph.2014.01.013 es_ES
dc.description.upvformatpinicio 842 es_ES
dc.description.upvformatpfin 857 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 171 es_ES
dc.description.issue 10 es_ES
dc.relation.senia 276858 es_ES


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