biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 52:385-390, 2008 | DOI: 10.1007/s10535-008-0081-9

Leaf gas exchange, water relations, nutrient content and growth in citrus and olive seedlings under salinity

J. C. Melgar1, J. P. Syvertsen2, V. Martínez3, F. García-Sánchez3,*
1 Departmento de Agronomía, Universidad de Córdoba, Edificio Celestino Mutis, Córdoba, Spain
2 UF/IFAS, Citrus Research and Education Center, Lake Alfred, USA
3 Centro de Edafología y Biología Aplicada del Segura, CSIC, Campus Universitario de Espinardo, Espinardo, Murcia, Spain

The effects of salinity on growth, leaf nutrient content, water relations, gas exchange parameters and chlorophyll fluorescence were studied in six-month-old seedlings of citrus (Citrus limonia Osbeck) and rooted cuttings of olive (Olea europaea L. cv. Arbequina). Citrus and olive were grown in a greenhouse and watered with half strength Hoagland's solution plus 0 or 50 mM NaCl for citrus, or plus 0 or 100 mM NaCl for olive. Salinity increased Cl- and Na+ content in leaves and roots in both species and reduced total plant dry mass, net photosynthetic rate and stomatal conductance. Decreased growth and gas exchange was apparently due to a toxic effect of Cl- and/or Na+ and not due to osmotic stress since both species were able to osmotically adjust to maintain pressure potential higher than in non-salinized leaves. Internal CO2 concentration in the mesophyll was not reduced in either species. Salinity decreased leaf chlorophyll a content only in citrus.

Keywords: chlorophyll fluorescence; leaf chlorophyll content; NaCl; photosynthesis; rootstock
Subjects: chlorophyll a,b; chlorophyll fluorescence; Citrus; CO2 concentration, internal; gas exchange; gas exchange; Olea europaea; olive; rootstock; salinity, salt stress; transpiration rate; water relations, daily variations

Received: September 20, 2006; Accepted: February 17, 2007; Published: June 1, 2008  Show citation

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Melgar, J.C., Syvertsen, J.P., Martínez, V., & García-Sánchez, F. (2008). Leaf gas exchange, water relations, nutrient content and growth in citrus and olive seedlings under salinity. Biologia plantarum, 52(2), 385-390. doi: 10.1007/s10535-008-0081-9
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