AOBPreview originally published online on March 16, 2004
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Annals of Botany 93: 529-535, 2004
© 2004 Annals of Botany Company
Microgeographic Genome Size Differentiation of the Carob Tree, Ceratonia siliqua, at ‘Evolution Canyon’, Israel
1 PAVLÍ
EK*,2
1 Department of Botany, Masaryk University, Kotlá
ská 2, 611 37 Brno, Czech Republic and 2 Institute of Evolution, University of Haifa, Mount Carmel 31905, Israel
* For correspondence. E-mail: patricia{at}research.haifa.ac.il
Received: 7 November 2003; Returned for revision: 26 December 2003; Accepted: 22 January 2004 Published electronically: 16 March 2004
• Background and Aims We tested whether the local differences in genome size recorded earlier in the wild barley, Hordeum spontaneum, at ‘Evolution Canyon’, Mount Carmel, Israel, can also be found in other organisms. As a model species for our test we chose the evergreen carob tree, Ceratonia siliqua.
• Methods Genome size was measured by means of DAPI flow cytometry.
• Key Results In adults, significantly more DNA was recorded in trees growing on the more illuminated, warmer, drier, microclimatically more fluctuating ‘African’ south-facing slope than in trees on the opposite, less illuminated, cooler and more humid, ‘European’ north-facing slope in spite of an interslope distance of only 100 m at the canyon bottom and 400 m at the top. The amount of DNA was significantly negatively correlated with leaf length and tree circumference. In seedlings, interslope differences in the amount of genome DNA were not found. In addition, the first cases of triploidy and tetraploidy were found in C. siliqua.
• Conclusions The data on C. siliqua at ‘Evolution Canyon’ showed that local variability in the C-value exists in this species and that ecological stress might be a strong evolutionary driving force in shaping the amount of DNA.
Key words: Ceratonia siliqua, carob, DNA content, flow cytometry, genome size, ‘Evolution Canyon’.
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