F-box protein MAX2 has dual roles in karrikin and strigolactone signaling in Arabidopsis thaliana

Nelson, David C., Scaffidi, Adrian, Dun, Elizabeth A., Waters, Mark T., Flematti, Gavin R., Dixon, Kingsley W., Beveridge, Christine A., Ghisalberti, Emilio L. and Smith, Steven M. (2011) F-box protein MAX2 has dual roles in karrikin and strigolactone signaling in Arabidopsis thaliana. Proceedings of the National Academy of Sciences of USA, 108 21: 8897-8902. doi:10.1073/pnas.1100987108


Author Nelson, David C.
Scaffidi, Adrian
Dun, Elizabeth A.
Waters, Mark T.
Flematti, Gavin R.
Dixon, Kingsley W.
Beveridge, Christine A.
Ghisalberti, Emilio L.
Smith, Steven M.
Title F-box protein MAX2 has dual roles in karrikin and strigolactone signaling in Arabidopsis thaliana
Formatted title
F-box protein MAX2 has dual roles in karrikin and strigolactone signaling in Arabidopsis thaliana
Journal name Proceedings of the National Academy of Sciences of USA   Check publisher's open access policy
ISSN 0027-8424
1091-6490
Publication date 2011-05-24
Year available 2011
Sub-type Article (original research)
DOI 10.1073/pnas.1100987108
Open Access Status Not yet assessed
Volume 108
Issue 21
Start page 8897
End page 8902
Total pages 6
Editor Peter H. Quail
Place of publication Washington, DC, United States
Publisher National Academy of Sciences
Language eng
Abstract Smoke is an important abiotic cue for plant regeneration in postfire landscapes. Karrikins are a class of compounds discovered in smoke that promote seed germination and influence early development of many plants by an unknown mechanism. A genetic screen for karrikin-insensitive mutants in Arabidopsis thaliana revealed that karrikin signaling requires the F-box protein MAX2, which also mediates responses to the structurally-related strigolactone family of phytohormones. Karrikins and the synthetic strigolactone GR24 trigger similar effects on seed germination, seedling photomorphogenesis, and expression of a small set of genes during these developmental stages. Karrikins also repress MAX4 and IAA1 transcripts, which show negative feedback regulation by strigolactone. We demonstrate that all of these common responses are abolished in max2 mutants. Unlike strigolactones, however, karrikins do not inhibit shoot branching in Arabidopsis or pea, indicating that plants can distinguish between these signals. These results suggest that a MAX2-dependent signal transduction mechanism was adapted to mediate responses to two chemical cues with distinct roles in plant ecology and development.
Formatted abstract
Smoke is an important abiotic cue for plant regeneration in postfire landscapes. Karrikins are a class of compounds discovered in smoke that promote seed germination and influence early development of many plants by an unknown mechanism. A genetic screen for karrikin-insensitive mutants in Arabidopsis thaliana revealed that karrikin signaling requires the F-box protein MAX2, which also mediates responses to the structurally-related strigolactone family of phytohormones. Karrikins and the synthetic strigolactone GR24 trigger similar effects on seed germination, seedling photomorphogenesis, and expression of a small set of genes during these developmental stages. Karrikins also repress MAX4 and IAA1 transcripts, which show negative feedback regulation by strigolactone. We demonstrate that all of these common responses are abolished in max2 mutants. Unlike strigolactones, however, karrikins do not inhibit shoot branching in Arabidopsis or pea, indicating that plants can distinguish between these signals. These results suggest that a MAX2-dependent signal transduction mechanism was adapted to mediate responses to two chemical cues with distinct roles in plant ecology and development.
Keyword Seed-germination
Leaf senescence
Acts downstream
Bud outgrowth
Auxin
Pea
Mechanism
Stimulant
Genes
Smoke
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP0667197
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
 
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Created: Sat, 03 Sep 2011, 02:12:40 EST by Gail Walter on behalf of School of Biological Sciences