Journal Article

Low temperature during winter elicits differential responses among populations of the Mediterranean evergreen cork oak (<i>Quercus suber</i>)

I. Aranda, L. Castro, R. Alía, J. A. Pardos and L. Gil

in Tree Physiology

Volume 25, issue 8, pages 1085-1090
Published in print August 2005 | ISSN: 0829-318X
Published online August 2005 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/25.8.1085
Low temperature during winter elicits differential responses among populations of the Mediterranean evergreen cork oak (Quercus suber)

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Populations of cork oak (Quercus suber L.) were assessed for seasonal and inter-population variability in, and temperature responses of, the ratio between light-induced variable and maximum fluorescence of chlorophyll, Fv/Fm, considered a surrogate for the maximum photochemical efficiency of photosystem II (PSII). Seedlings from 10 populations throughout the distribution range of Q. suber in the Mediterranean basin were grown in a common garden in central Spain. The Fv/Fm ratio of dark-adapted leaves was measured at dawn every month for 2 years. Air temperature was recorded at a nearby climatic station.

During the summer, when maximum air temperatures reached 40 °C, there were no significant differences in Fv/Fm among populations, but significant differences were seen during the winter. In colder months, Fv/Fm ranged in all populations between 0.5–0.6 and 0.2–0.3 in 2001 and 2002, respectively. The variance explained by the population effect was greatest during winter months, especially in 2002, reaching a peak value of 10% when minimum air temperature was below –10 °C. Populations originating from warmer sites showed the largest decline in Fv/Fm between the end of 2001 and the beginning of 2002. Thus, a negative linear relationship was established between mean annual temperature at the population source and population mean Fv/Fm recorded in the coldest month in 2002 and normalized by the Fv/Fm spring measurement.

Keywords: chlorophyll fluorescence; cold; Mediterranean evergreen oak; photoinhibition

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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