RT Journal Article
SR Electronic
T1 Independent evolution of ab- and adaxial stomatal density enables adaptation
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 034355
DO 10.1101/034355
A1 Christopher D. Muir
A1 Miquel Ángel Conesa
A1 Jeroni Galmés
YR 2015
UL http://biorxiv.org/content/early/2015/12/15/034355.abstract
AB Are organisms free to reach their adaptive optima or constrained by hard-wired developmental programs? Recent evidence suggests that the arrangement of stomata on abaxial (lower) and adaxial (upper) leaf surfaces may be an important adaptation in plants, but stomatal traits on each surface likely share developmental pathways that could hamper evolution.We reviewed the quantitative genetics of stomatal density to look for loci that (1) affected ab- or adaxial density independently or (2) pleiotropically affected stomatal density on both surfaces. We also used phylogenetic comparative methods to test for independent versus correlated evolution of stomatal traits (density, size, and pore index) on each surface from 14 amphistomatous wild tomato taxa (Solanum; Solanaceae).Naturally occurring and laboratory-induced genetic variation alters stomatal density on one surface without affecting the other, indicating that development does not strongly constrain the spectrum of available mutations. Among wild tomato taxa, traits most closely related to function (stomatal pore index and density) evolved independently on each surface, whereas stomatal size was constrained by correlated evolution.Genetics and phylogenetics demonstrate mostly independent evolution of stomatal function on each leaf surface, facilitating largely unfettered access to fitness optima.