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F-box protein MAX2 has dual roles in karrikin and strigolactone signaling in Arabidopsis thaliana
Citation
Nelson, DC and Scaffidi, A and Dun, EA and Waters, MT and Flematti, GR and Dixon, KW and Beveridge, CA and Ghisalberti, EL and Smith, SM, F-box protein MAX2 has dual roles in karrikin and strigolactone signaling in Arabidopsis thaliana, Proceedings of the National Academy of Sciences of The United States of America., 108, (21) pp. 8897-8902. ISSN 0027-8424 (2011) [Refereed Article]
Copyright Statement
© 2015 National Academy of Sciences.
DOI: doi:10.1073/pnas.1100987108
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.
Item Details
Item Type: | Refereed Article |
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Keywords: | smoke, Arabidopsis thaliana, smoke, karrikins, seed germination, F-box protein MAX2, phytohormones, strigolactones, signalling |
Research Division: | Biological Sciences |
Research Group: | Plant biology |
Research Field: | Plant physiology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the biological sciences |
UTAS Author: | Smith, SM (Professor Steven Smith) |
ID Code: | 101466 |
Year Published: | 2011 |
Web of Science® Times Cited: | 301 |
Deposited By: | Plant Science |
Deposited On: | 2015-06-24 |
Last Modified: | 2017-11-02 |
Downloads: | 0 |
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