The importance of regeneration to plant habitat specialization has been poorly studied. ten Brink et al. examine the adaptive association between germination ecology and specialization to either forest or open habitats in a comparative experiment using 17 congeneric species pairs with contrasting habitat preference. They find that seeds of forest and open habitat species respond differently to environmental cues. In a conceptual model they show that species from the two habitats are adapted to utilize different windows of opportunity in time (season) and space (habitat), and they suggest that phases in the plant life cycle other than the established phase should be considered important in adaptive specialization.
ADP-glucose pyrophosphorylase (AGPase), a key enzyme in starch biosynthesis, is comprised of large (LSU) and small (SSU) sub-units encoded by multiple paralogous genes in angiosperms. Corbi et al. investigate the patterns of molecular evolution of AGPase genes following duplications. They find that both coevolution among amino acid residues located in between-sub-unit interaction domains or within the highly constrained SSU, and repeated subfunctionalization events under the ‘Escape from Adaptive Conflict’ model have contributed to AGPase evolution.