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Related Experiment Videos

Stomatal oscillations in olive trees: analysis and methodological implications.

Alvaro López-Bernal1, Omar García-Tejera1,2, Luca Testi2

  • 1Dpto de Agronomia, Universidad de Córdoba, Campus de Rabanales, Edificio C4 Celestino Mutis. Ctra Madrid, Km 396, 14071 Córdoba, Spain.

Tree Physiology
|October 18, 2017
PubMed
Summary

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Stomatal oscillations occur frequently in young olive trees but rarely in mature ones. Frequent measurements are crucial for accurate data, especially under moderate water stress.

Area of Science:

  • Plant Physiology
  • Plant Water Relations

Background:

  • Stomatal oscillations, a dynamic physiological process, have been underreported in scientific literature.
  • Understanding these oscillations is crucial for accurate plant physiological assessments.

Purpose of the Study:

  • To investigate the occurrence of stomatal oscillations in olive trees (Olea europaea L.) under various conditions.
  • To explore the methodological implications of these oscillations on data collection and interpretation.

Main Methods:

  • Sap flow measurements were the primary technique for detecting oscillations.
  • Trunk diameter variations, stomatal conductance, photosynthesis, and water potential were also measured.
  • Experiments were conducted on young potted and mature field-grown olive trees.

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Main Results:

  • Young potted olive trees exhibited strong stomatal oscillations (30-60 min periods).
  • Mature field-grown trees rarely showed significant oscillations.
  • Severe water stress eliminated oscillations, while moderate deficits sometimes promoted them.
  • Oscillations were synchronized across stomatal conductance, photosynthesis, and trunk diameter.

Conclusions:

  • Frequent measurements (below 15 min intervals) are essential for accurate physiological assessments in young olive trees.
  • The presence of strong oscillations can confound studies comparing cultivars or treatments based on infrequent data.
  • Stomatal oscillations are a significant factor in plant water relations and require consideration in experimental design.