Stomatal Density Responses of Egyptian Olea europaea L. Leaves

Main Focus

• Study on how Egyptian Olea europaea L. leaves respond to changes in atmospheric CO levels since 1327 BC.
• Examination of ancient leaf material to observe stomatal density changes.
• Published in Annals of Botany by David J. Beerling and William G. Chaloner.

Key Concepts

• Stomatal Density: Refers to the number of stomata (tiny openings on leaf surfaces) per unit area.
• CO Levels: Changes in carbon dioxide levels in the atmosphere over a long historical period.

Study Overview

• Objective: Separate effects of CO and temperature change on stomatal density.
• Method:
  • Analysis of Olea europaea leaves from various historical periods:
    • King Tutankhamun’s tomb (1327 BC)
    • Period pre-332 BC
    • Year 1818
    • Year 1978
• Findings:
  • Stomatal density decreases as CO levels increase.
  • Results align with similar studies over different timescales (hundreds to tens of thousands of years).
  • The study confirms observations from controlled experiments.

Environmental Context

• Mediterranean Climate: Region where Olea europaea is naturally found.
• Consistent temperature conditions across the studied timeline, making CO the primary variable.

Implications

• Provides insight into plant responses to changing atmospheric conditions.
• Supports broader ecological and climatological research by confirming experimental findings with historical natural evidence.

Publication Details

• Published By: Oxford University Press
• Journal: Annals of Botany, Vol. 71, No. 5, May 1993
• Pages: 431-435

Accessing the Study

• Available on JSTOR, with login options through personal accounts or institutional access.
• Part of a JSTOR collection published by Oxford University Press.

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