Fig. 6

Proposed model for effects of contrasting genotypes on A. lyrata shoot development phenology under long and short growing seasons. Developing shoots are depicted by arrows in the diagrams, with the vegetative stage shown in green and the reproductive stage (inflorescence) in orange. Shoots undergo reproductive transitions only during the reproductive season bounded by temperature and photoperiod cues (orange dashed wedge). a Under long growing seasons, genotypes with short shoot vegetative stages (inner ring) will produce many inflorescences. A small subset of shoots initiating near the end of the reproductive season will not have time to acquire reproductive capability, and will thus remain vegetative afterwards. Subsequent vegetative development can occur on these shoots throughout the fall and possibly through the winter. Genotypes with long shoot vegetative stages (outer ring) will produce fewer inflorescences and have more shoots remaining vegetative at the end of the reproductive season. b Under short growing seasons, the reproductive season starts later in the spring, and temperatures are too cold for growth to occur during much of the year (blue shaded area). Genotypes with short shoot vegetative stages will thus have very limited opportunity for vegetative recovery after the reproductive season