Photosynthetica 1999, 36(11):17 | DOI: 10.1023/A:1007058611140
Seasonal Changes in Photochemical Efficiency in Leaves of Halimium Halimifolium, a Mediterranean Semideciduous Shrub
- 1 Departamento de Biologia Vegetal y Ecologia, Facultad de Biologia, Universidad de Sevilla, Sevilla, Spain
The relationship between soil water availability, physiological responses [leaf chlorophyll (Chl) fluorescence, leaf water potential (Ψ), and stomatal conductance (g s)] and plant stress was studied in Halimium halimifolium (L.) Willk, Cistaceae, in three sites with contrasted water regimes (Monte Blanco - MB, Monte Intermedio - MI, and Monte Negro - MN) of Doñana National Park (SW of Spain) along the day, in September (summer period) and December (winter period) 1994. In winter, differences among the areas were not significant, with Ψ, g s, and photochemical efficiency values of -1.5 MPa, 0.200 cm s-1, and 0.70, respectively. In summer, however, high declines of g s (0.014 cm s-1 in MI and 0.021 cm s-1 in MB), photochemical efficiency (0.65 Fv/Fp in MB and MI sites) and Ψ (-3.76 in MI and -3.04 MPa in MB) were recorded. Winter-summer differences were minimum in well-watered sites (MN) and maximum in MI. The Ψ and photosystem 2 (PS2) fluorescence were correlated and showed similar seasonal patterns in all three areas.
Additional key words: chlorophyll fluorescence; drought; leaf water potential; photosystem 2; plant stress; soil water availability; stomatal conductance
Published: July 1, 1999 Show citation
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