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Smoke signals and seed dormancy: where next for MAX2?
journal contribution
posted on 2023-05-18, 11:14 authored by Waters, MT, Steven SmithSteven Smith, Nelson, DCThe Arabidopsis thaliana F-box protein MAX2 has been discovered in four separate genetic screens, indicating that it has roles in leaf senescence, seedling photosensitivity, shoot outgrowth, and seed germination. Both strigolactones and karrikins can regulate A. thaliana seed germination and seedling photomorphogenesis in a MAX2-dependent manner, but only strigolactones inhibit shoot branching. How MAX2 mediates specific responses to both classes of structurally-related signals, and the origin of its dual role remains unknown. The moss Physcomitrella patens utilizes strigolactones and MAX2 orthologs are present across the land plants, suggesting that this signaling system could have an ancient origin. The seed of parasitic Orobanchaceae species germinate preferentially in response to strigolactones over karrikins, and putative Orobanchaceae MAX2 orthologs form a sub-clade distinct from those of other dicots. These observations suggest that lineage-specific evolution of MAX2 may have given rise to specialized responses to these signaling molecules.
History
Publication title
Plant Signaling and BehaviorVolume
6Issue
9Pagination
1418-1422ISSN
1559-2324Department/School
School of Natural SciencesPublisher
Taylor and FrancisPlace of publication
United KingdomRights statement
Copyright 2011 Landes BioscienceRepository Status
- Restricted