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Determination of proline concentration, an abiotic stress marker, in root exudates of excised root cultures of fruit tree rootstocks under salt stress

AuthorsMarín Velázquez, Juan Antonio CSIC ORCID ; Andreu Puyal, Pilar CSIC ORCID ; Carrasco, A.; Arbeloa Matute, Arancha CSIC ORCID
KeywordsEarly selection
Abiotic stress
Prunus insititia
Prunus cerasus
Prunus dulcis x persica
Issue DateFeb-2010
PublisherInstitut des régions arides (Tunisie)
CitationRevue des Régions Arides 24: 722-727 (2010)
AbstractRoot exudates have important, yet incompletely known, roles in plant physiology, mainly in rhizosphere interactions with other organisms. Proline might play a critical role in protecting plants under stress, particularly under saline conditions. However, as far as we know, no attempts have been made to determine the proline content of root exudates. Here, we present preliminary results of the quantification of proline in root exudates of excised root cultures of Prunus rootstocks. Roots from micro-propagated Prunus rootstocks (‗Masto de Montaðana,‘ GF677 and ‗Adesoto 101‘) were cultured in vitro under increasing NaCl concentrations (0, 20, 60, 180 mM) to detect their early tolerance to salt stress. After three weeks of culture, the proline content of both the root tissues and the MS-based liquid medium in which the roots were cultured was determined. The proline concentration in root tissues and root exudates from all rootstocks increased as salt concentration in the medium increased, following a trend similar to that of whole plant tissues. This indicated that the role of proline exudates in plant responses to salt stress could be studied using non-destructive methods. In addition, proline exudates could be useful for the early detection of salt stress tolerance, provided that a relationship between proline and salt stress tolerance could be found.
Description6 páginas, 4 figuras.-- Trabajo presentado Actes du 3º Meeting International "Aridoculture et Cultures Oasisennes: Gestion et Valorisation des Ressources et Applications Biotechnologiques dans les Agrosystèmes Arides et Sahariens" celebrado en Jerba (Túnez) del 15 al 17 de Diciembre de 2009. 15-16-17/12/2009
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