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Tolerance of young (Ceratonia siliqua L.) carob rootstock to NaCl

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  • Correia, P.J.
  • Gama, F.
  • Pestana, M.
  • Martins-Loução, M.A.

Abstract

One-year-old carob (Ceratonia siliqua L.) rootstock was grown in fertilised substrate to evaluate the effects of NaCl salinity stress. The experiment consisted of seven treatments with different concentrations of NaCl in the irrigation water: 0 (control), 15, 30, 40, 80, 120 and 240 (mmolL-1), equivalent to electrical conductivities of 0.0, 1.5, 2.9, 3.9, 7.5, 10.9 and 20.6dSm-1, respectively. Several growth parameters were measured throughout the experimental period. At the end of the experiment, pH, extractable P and K, and the electrical conductivity of the substrate were assessed in each salinity level. On the same date, the mineral composition of the leaves was compared. The carob rootstock tolerated 13.4dSm-1 for a period of 30 days but after 60 days the limit of tolerance was only 6.8dSm-1. Salt tolerance indexes were 12.8 and 4.5 for 30 and 60 days, respectively. This tolerance to salinity resulted from the ability to function with concentrations of Cl- and Na+ in leaves up to 24.0 and 8.5gkg-1, respectively. Biomass allocation to shoots and roots was similar in all treatments, but after 40 days the number of leaves was reduced, particularly at the larger concentrations (120 and 240mmolNaClL-1). Leaves of plants irrigated with 240mmolNaClL-1 became chlorotic after 30 days exposure. However, concentrations of N, P, Mg and Zn in leaves were not affected significantly (P>0.05) by salinity. Apparently, K+ and Ca2+ were the key nutrients affected in the response of carob rootstocks to salinity. Plants grown with 80 and 120mmolL-1 of NaCl contained the greatest K+ concentration. Na+/K+ increased with salinity, due to an elevated Na+ content but K+ uptake was also enhanced, which alleviated some Na+ stress. Ca2+ concentration in leaves was not reduced under salinity. Salinization of irrigation water and subsequent impacts on agricultural soils are now common problems in the Mediterranean region. Under such conditions, carob seems to be a salt as well as a drought tolerant species.

Suggested Citation

  • Correia, P.J. & Gama, F. & Pestana, M. & Martins-Loução, M.A., 2010. "Tolerance of young (Ceratonia siliqua L.) carob rootstock to NaCl," Agricultural Water Management, Elsevier, vol. 97(6), pages 910-916, June.
    • Handle: RePEc:eee:agiwat:v:97:y:2010:i:6:p:910-916
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    References listed on IDEAS

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    1. Chartzoulakis, K.S., 2005. "Salinity and olive: Growth, salt tolerance, photosynthesis and yield," Agricultural Water Management, Elsevier, vol. 78(1-2), pages 108-121, September.
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    1. Blanca M. Plaza & Juan Reca & Juan Martínez & Francisco Alex & Maria Teresa Lao, 2019. "Sustainable Irrigation Management of Ornamental Cordyline Fruticosa “Red Edge” Plants with Saline Water," Sustainability, MDPI, vol. 11(13), pages 1-16, July.

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