Jasmin JN and Zeyl C (2012) Life-history evolution and density-dependent growth in experimental populations of yeast. Evolution 66(12):3789-802
Abstract: We studied the evolution of the correlation between growth rate r and yield K in experimental lineages of the yeast Saccharomyces cerevisiae. First, we isolated a single clone every approximately 250 generations from each of eight populations selected in a glucose-limited medium for 5000 generations at approximately 6.6 population doublings per day (20 clones per line x 8 lines) and measured its growth rate and yield in a new, galactose-limited medium (with approximately 1.3 doubling per day). For most lines, r on galactose increased throughout the 5000 generations of selection on glucose whereas K on galactose declined. Next, we selected these 160 glucose-adapted clones in the galactose environment for approximately 120 generations and measured changes in r and K in galactose. In general, growth rate increased and yield declined, and clones that initially grew slowly on galactose improved more than did faster clones. We found a negative correlation between r and K among clones both within each line and across all clones. We provide evidence that this relationship is not heritable and is a negative environmental correlation rather than a genetic trade-off.CI - (c) 2012 The Author(s). Evolution(c) 2012 The Society for the Study of Evolution.
|Status: Published||Type: Journal Article||PubMed ID: 23206137|