1 School of Biosciences, Cardiff University, PO Box 915, Cardiff CF1 3TL, UK
francisd{at}cardiff.ac.uk
Previously, we found a significant negative correlation between DNA C-value and altitude among eight natural populations of Dactylis glomerata L. (Creber et al., New Phytologist 128: 555–561, 1994). We have examined the extent to which similar negative relationships exist in other altitudinal transects, one in southern France and the other in Italy. Using Feulgen microdensitometry, C-values were negatively correlated with altitude both for the French and Italian populations. A combined plot of DNA C-values against altitude for all of the transects (representing C-values for 17 natural populations), exhibited a highly significant negative relationship; there was a 1·3-fold variation in DNA C-value from the largest genome-lowest altitude to the smallest genome-highest altitude natural population. Such a consistent marked altitudinal cline suggests strong nucleotypic selection acting upon these populations with increasing altitude. Preliminary examination of amplified fragment length polymorphisms between populations selected from the upper and lower limits of the French and Italian transects has shown that these populations are genetically distinct. The extent to which this genetic separation is related to altitude or genome size, or both, is discussed.
Altitude, AFLPs, Dactylis glomerata, DNA C-value
Submitted on October 29, 1997
© 1998 Annals of Botany Company
Genome Size is Negatively Correlated with Altitude in Natural Populations of Dactylis glomerata
2 The Jodrell Laboratory, Royal Botanic Gardens, Kew, Surrey TW9 3DS, UK
Revised on June 17, 1998
Accepted on July 2, 1998
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