The crucifer Arabidopsis thaliana has been the subject of intense research
into molecular and developmental genetics. One of the consequences of havin
g this wealth of physiological and molecular data available, is that ecolog
ists and evolutionary biologists have begun to incorporate this model syste
m into their studies. Current research on A. thaliana and its close relativ
es ably illustrates the potential for synergy between mechanistic and organ
ismal biology. On the one hand, mechanistically oriented research can be pl
aced in an historical context, which takes into account the particular phyl
ogenetic history and ecology of these species. This helps us to make sense
of redundancies, anomalies and sub-optimalities that would otherwise be dif
ficult to interpret. On the other hand, ecologists and evolutionary biologi
sts now have the opportunity to investigate the physiological and molecular
basis for the phenotypic changes they observe. This provides new insight i
nto the mechanisms that influence evolutionary change.