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Aquaporins isoforms in cv. Touriga Nacional grapevine under water stress and recovery—Regulation of expression in leaves and roots

Author

Listed:
  • Zarrouk, Olfa
  • Garcia-Tejero, Ivan
  • Pinto, Clara
  • Genebra, Tania
  • Sabir, Farzana
  • Prista, Catarina
  • David, Teresa Soares
  • Loureiro-Dias, Maria C.
  • Chave, Maria Manuela

Abstract

The aim of this work was to advance the knowledge in aquaporins expression and physiological responses of Touriga Nacional grapevine to water stress and recovery. Ungrafted grapevines cv. Touriga Nacional were subjected to two different irrigation treatments: (i) a well watered treatment (WW), in which vines were daily irrigated, being maintained at field capacity; (ii) and a water stress treatment (WS), in which vines were not irrigated along six days, with a later recovery (Rec), with these vines being re-irrigated at field capacity. Measurements started 48h after treatments application (T1, mild stress), and from this point on, every 48h until the maximum water stress point was reached (144h after the beginning of the trial, T2). After this point WS plants were re-watered, and 48h after this recovery, measurements were taken again in both treatments. The expression pattern of different aquaporins (VvPIP2;1–VvTIP1;1–VvTIP2;1–VvTIP2;2 and VvSIP) was studied in roots and leaves in both treatments at T1, T2 and Rec respectively. With the same periodicity, leaf and root specific hydraulic conductivity (Ks-leaf; Ks-root), abscisic acid (ABA) concentration, xylem sieve pH and leaf temperature were assessed. Both VvPIP2;1 and VvTIP2;2 were down regulated in WS roots, which was in line with the decrease observed in Ks-root. However, non-significant effects on Ks-leaf were observed in WS, in parallel with an up-regulation of VvPIP2;1 and VvTIP1;1. An increase of ABA in roots and leaves of WS vines was observed, in line with the results of vine water status, leaf temperature and pH of xylem sieve. Overall, results demonstrate the existence of different regulatory mechanisms occurring in response to water stress, being dependent on stress intensity and plant organ.

Suggested Citation

  • Zarrouk, Olfa & Garcia-Tejero, Ivan & Pinto, Clara & Genebra, Tania & Sabir, Farzana & Prista, Catarina & David, Teresa Soares & Loureiro-Dias, Maria C. & Chave, Maria Manuela, 2016. "Aquaporins isoforms in cv. Touriga Nacional grapevine under water stress and recovery—Regulation of expression in leaves and roots," Agricultural Water Management, Elsevier, vol. 164(P1), pages 167-175.
    • Handle: RePEc:eee:agiwat:v:164:y:2016:i:p1:p:167-175
    DOI: 10.1016/j.agwat.2015.08.013
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    1. Martorell, S. & Diaz-Espejo, A. & Tomàs, M. & Pou, A. & El Aou-ouad, H. & Escalona, J.M. & Vadell, J. & Ribas-Carbó, M. & Flexas, J. & Medrano, H., 2015. "Differences in water-use-efficiency between two Vitis vinifera cultivars (Grenache and Tempranillo) explained by the combined response of stomata to hydraulic and chemical signals during water stress," Agricultural Water Management, Elsevier, vol. 156(C), pages 1-9.
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    Cited by:

    1. Quiroga, Gabriela & Erice, Gorka & Aroca, Ricardo & Zamarreño, Ángel María & García-Mina, José María & Ruiz-Lozano, Juan Manuel, 2018. "Arbuscular mycorrhizal symbiosis and salicylic acid regulate aquaporins and root hydraulic properties in maize plants subjected to drought," Agricultural Water Management, Elsevier, vol. 202(C), pages 271-284.

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