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Distinct ancient structural polymorphisms control heterodichogamy in walnuts and hickories
Jeffrey S Groh1,2, Diane C Vik1, Kristian A Stevens1,3
1Department of Evolution and Ecology, University of California, Davis.
Biorxiv : the Preprint Server for Biology
|January 8, 2024
Summary
This study investigates heterodichogamy, a mating system in walnuts and pecans, revealing two ancient genetic mechanisms controlling this floral trait. These findings shed light on the evolution of plant mating systems and balancing selection.
Area of Science:
- * Evolutionary Biology
- * Plant Genetics
- * Molecular Ecology
Background:
- * Heterodichogamy is a balanced mating polymorphism in angiosperms, common in Juglandaceae (walnuts and pecans).
- * This system, crucial for maintaining species' reproductive success, is controlled by a single dominant allele in both *Juglans* and *Carya* genera.
- * Understanding the genetic underpinnings of heterodichogamy provides insights into balancing selection and the evolution of plant mating systems.
Conclusions:
- * Heterodichogamy in Juglandaceae is controlled by ancient, distinct genetic mechanisms involving structural variants and gene clusters.
- * These findings highlight the role of balancing selection in shaping complex mating systems through different evolutionary pathways.
- * The study suggests that additional genetic systems for heterodichogamy may exist in other genera.
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