Potassium Starvation Increases Stomatal Conductance in Olive Trees

in HortScience
View More View Less
  • 1 Centro de Investigación y Formación Agraria, IFAPA, Apdo. 3092, E-14080, Córdoba, Spain
  • 2 Departamento de Agronomía, Escuela T.S. Ingenieros Agrónomos y de Montes, Universidad de Córdoba, Apdo. 3048, E-14080, Córdoba, Spain

The effects of potassium (K) status and water availability in the growth medium on growth, water content, water-use efficiency and stomatal conductance was studied in mist-rooted `Chemlali de Sfax' olive (Olea europaea L.) cuttings grown in a perlite substrate. Potassium starvation produced dehydration of all parts of the plant, reduced shoot growth and water-use efficiency. By contrast, K starvation enhanced stomatal conductance in well-irrigated plants and, even more, in water-stressed plants. These results suggest that moderate K deficiency in olives may impair the plant's ability to regulate stomatal closure; this may account for the dehydration observed in K-starved plants, particularly in situations of water stress. This result is of great importance for agricultural practices of this crop, because K status, which may not be considered deficient, can cause disorders in olive trees.

If the inline PDF is not rendering correctly, you can download the PDF file here.

Contributor Notes

Corresponding author; e-mail ag1bemam@uco.es.
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 342 138 17
PDF Downloads 378 183 15