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Abstract

Plants require access to photosynthetically active radiation (PAR), which also exposes them to potentially damaging ultraviolet wavelengths. Anthocyanin is a secondary compound which provides red coloration for flowers and has been shown to absorb light in the UV spectrum. Ipomopsis aggregata displays flower color varying from pink to scarlet red, correlated with anthocyanin content. In this study, we compared the UV protective qualities of I. aggregata individuals with scarlet flowers (dark-colored) to plants with pink flowers (light-colored) using a combination of field observations (Manitou Experimental Forest) and in situ experimental manipulations. The field methodology included measurements on photosynthetic efficiency, stomatal conductance, anthocyanin content, chlorophyll content and leaf temperature to attempt to understand if there were differences among the light and dark colored morphs. Germination rate and seed mass were also quantified. The dark morphologies had greater anthocyanin content which could allow them greater UV protection. Dark morphologies also had higher photosystem efficiency, chlorophyll content, stomatal conductance, seed mass and germination rate. However, light morphologies may have a greater diversity of pollinators. This could indicate a reproductive and survivorship trade-off, connected directly to flavonoid content, between pollinator attraction and protection from UV damage in a mid-elevation plant population.

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