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Acta Biologica Hungarica

, Volume 63, Issue 1, pp 97–112 | Cite as

Involvement of Source-Sink Relationship and Hormonal Control in the Response of Medicago Ciliaris — Sinorhizobium Medicae Symbiosis to Salt Stress

  • Imène Ben SalahEmail author
  • Nahida Jelali
  • T. Slatni
  • Margaret Gruber
  • A. Albacete
  • Cristina Martínez Andújar
  • V. Martinez
  • F. Pérez-Alfocea
  • C. Abdelly
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Abstract

In order to explore the relationship between leaf hormonal status and source-sink relations in the response of symbiotic nitrogen fixation (SNF) to salt stress, three major phytohormones (cytokinins, abscisic acid and the ethylene precursor 1-aminocyclopropane-l-carboxylic acid), sucrose phosphate synthase activity in source leaves and sucrolytic activities in sink organs were analysed in two lines of Medicago ciliaris (salt-tolerant TNC 1.8 and salt-sensitive TNC 11.9). SNF (measured as nitrogenase activity and amount of N-fixed) was more affected by salt treatment in the TNC 11.9 than in TNC 1.8, and this could be explained by a decrease in nodule sucrolytic activities. SNF capacity was reflected in leaf biomass production and in the sink activity under salinity, as suggested by the higher salt-induced decrease in the young leaf sucrolytic activities in the sensitive line TNC 11.9, while they were not affected in the tolerant line TNC 1.8. As a consequence of maintaining sink activities in the actively growing organs, the key enzymatic activity for synthesis of sucrose (sucrose phosphate synthase) was also less affected in the mature leaves of the more tolerant genotype. Ours results showed also that the major hormone factor associated with the relative tolerance of TNC 1.8 was the stimulation of abscisic acid concentration in young leaves under salt treatment. This stimulation may control photosynthetic organ growth and also may contribute to a certain degree in the maintenance of coordinated sink-source relationships. Therefore, ABA may be an important component which conserves sucrose synthesis in source leaves.

Keywords

Nitrogen fixation phytohormones salt stress source-sink activity sucrose enzyme activities 

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© Akadémiai Kiadó, Budapest 2012

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Imène Ben Salah
    • 1
    Email author
  • Nahida Jelali
    • 1
  • T. Slatni
    • 1
  • Margaret Gruber
    • 3
  • A. Albacete
    • 2
  • Cristina Martínez Andújar
    • 2
  • V. Martinez
    • 2
  • F. Pérez-Alfocea
    • 2
  • C. Abdelly
    • 1
  1. 1.Laboratoire de Plantes ExtrêmophilesCBBCTunisia
  2. 2.Department of Plant NutritionCEBAS-CSICMurciaSpain
  3. 3.Saskatoon Research CentreAgriculture and Agri-Food Canada. 107 Science CrescSaskatoonCanada

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