No abstract

Registro de acceso restringido Este recurso no está disponible en acceso abierto por política de la editorial. No obstante, se puede acceder al texto completo desde la Universitat Jaume I o si el usuario cuenta con suscripción. Registre d'accés restringit Aquest recurs no està disponible en accés obert per política de l'editorial. No obstant això, es pot accedir al text complet des de la Universitat Jaume I o si l'usuari compta amb subscripció. Restricted access item This item isn't open access because of publisher's policy. The full--text version is only available from Jaume I University or if the user has a running suscription to the publisher's contents.

Registro de acceso restringido Este recurso no está disponible en acceso abierto por política de la editorial. No obstante, se puede acceder al texto completo desde la Universitat Jaume I o si el usuario cuenta con suscripción. Registre d'accés restringit Aquest recurs no està disponible en accés obert per política de l'editorial. No obstant això, es pot accedir al text complet des de la Universitat Jaume I o si l'usuari compta amb subscripció. Restricted access item This item isn't open access because of publisher's policy. The full--text version is only available from Jaume I University or if the user has a running suscription to the publisher's contents.

No abstract

In response to adverse environmental conditions, plants modify their metabolism in order to adapt to the new conditions. To differentiate common responses to abiotic stress from specific adaptation to a certain stress condition, two citrus rootstocks (Carrizo citrange and Cleopatra mandarin) with a different ability to tolerate stress were subjected to soil flooding and drought, two water stress conditions. In response to these conditions, both genotypes showed altered root proline and phenylpropanoid levels, especially cinnamic acid that was a common feature to Carrizo and Cleopatra. This was correlated with alterations in the levels of phenylpropanoid derivatives likely involved in lignin biosynthesis. In the regulatory part, levels of both stress hormones ABA and JA decreased in response to soil flooding irrespective of the genotype relative flooding tolerance but, on the contrary, concentration of both metabolites increased in response to drought, showing JA a transient accumulation after a few days and ABA a progressive pattern of increase. These responses are probably associated to different regulatory processes under soil flooding and drought. In addition, alterations in IAA levels in citrus roots seemed to be associated to particular stress tolerance. Moreover, both genotypes exhibited a low degree of overlapping in the metabolites induced under similar stress conditions, indicating a specific mechanism to cope with stress in plant species. Results also indicated a different metabolic basal status in both genotypes that could contribute to stress tolerance.