Supergene control of chiral development in mirror-image flowers
Xue, H.; Saltini, M.; Illing, N.; Shepherd, K.; Page-Macdonald, O.; Marketos, O.; Robertson, C.; Shankar, A.; Suess, S.; Kappel, C.; Alseekh, S.; Deinum, E. E.; Ingle, R. A.; Lenhard, M.
Show abstract
How genes determine the left-versus right-handed development of chiral structures is a fascinating question. The reciprocal placement of female and male organs on opposite sides of the midline in mirror-image flowers limits selfing and promotes efficient cross-pollination. Here we identify the molecular and developmental basis of floral handedness in butterfly lilies. Female and male organs deflect by a combination of genetically controlled chirality and gravitropism, orienting left and right with respect to an external rather than internal reference axis. Coordinated organ placement is controlled by a hemizygous supergene containing two causal loci, MIR156-R and YUCCA-R, responsible for opposite female and male organ orientation, respectively. This genomic architecture results in differential placement of the supergene alleles on the pollinators and maintenance of the reproductive polymorphism.
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