Together with earlier studies linking variation in light sensitivity to photoreceptor genes, our work suggests that photoreceptors may be a common target of natural selection. Furthermore, our results show that allelic variation of PHYB activity is due to amino acid rather than regulatory changes. We used transgenic analysis to test this association and confirmed experimentally that natural PHYB polymorphisms cause differential plant responses to light.
thaliana accessions, one of these five polymorphisms, I143L, was associated with variation in red light response. From 14 nonsynonymous polymorphisms, we chose 5 for further study based on previous QTL studies. thaliana individuals and in the close relative Arabidopsis lyrata. Because PHYB has been proposed as a candidate gene for several quantitative trait loci (QTLs) affecting light response, we have investigated sequence and functional variation in Arabidopsis PHYB. In Arabidopsis thaliana, phytochrome B (PHYB) is the dominant photoreceptor for red light and plays a major role in white light. The light responses of populations and species native to different habitats show adaptive variation understanding the mechanisms underlying photomorphogenic variation is therefore of significant interest. Plants have a sophisticated system for sensing and responding to their light environment.
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