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Journal of Plant Growth Regulation

, Volume 21, Issue 3, pp 234–240 | Cite as

Abscisic Acid Reduces Leaf Abscission and Increases Salt Tolerance in Citrus Plants

  • Aurelio  Gómez-Cadenas
  • Vicent  Arbona
  • Josep  Jacas
  • Eduardo  Primo-Millo
  • Manuel  Talon
Article

Abstract

This paper describes the physiological effects of abscisic acid (ABA) and 100 mM NaCl on citrus plants. Water potential, leaf abscission, ethylene production, photosynthetic rate, stomatal conductance, and chloride accumulation in roots and leaves were measured in plants of Salustiana scion [Citrus sinensis (L) Osbeck] grafted onto Carrizo citrange (Citrus sinensis [L.] Osbeck × Poncirus trifoliata [L.] Raf) rootstock. Plants under salt stress accumulated high amounts of chloride, increased ethylene production, and induced leaf abscission. Stomatal conductance and photosynthetic rates rapidly dropped after salinization. The addition of 10 mM ABA to the nutrient solution 10 days before the exposure to salt stress reduced ethylene release and leaf abscission. These effects were probably due to a decrease in the accumulation of toxic Cl- ions in leaves. In non-salinized plants, ABA reduced stomatal conductance and CO2 assimilation, whereas in salinized plants the treatment slightly increased these two parameters. The results suggest a protective role for ABA in citrus under salinity.

Keywords

Salt Stress Stomatal Conductance Ethylene Production Leaf Water Potential Citrus Sinensis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag New York Inc. 2003

Authors and Affiliations

  • Aurelio  Gómez-Cadenas
    • 1
  • Vicent  Arbona
    • 1
  • Josep  Jacas
    • 1
  • Eduardo  Primo-Millo
    • 2
  • Manuel  Talon
    • 2
  1. 1.Departmento de Ciencias ExperimentalesUniversitat Jaume ICastellóSpain
  2. 2.Departmento de Citricultura y Otros FrutalesInstituto Valenciano de Investigaciones AgrariasValenciaSpain

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