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

@article{Nelson2011FboxPM,
  title={F-box protein MAX2 has dual roles in karrikin and strigolactone signaling in Arabidopsis thaliana},
  author={David C. Nelson and Adrian Scaffidi and Elizabeth A. Dun and Mark T. Waters and Gavin R. Flematti and Kingsley W. Dixon and Christine A. Beveridge and Emilio L. Ghisalberti and Steven M. L. Smith},
  journal={Proceedings of the National Academy of Sciences},
  year={2011},
  volume={108},
  pages={8897 - 8902}
}
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… Expand

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News Article
Smoke signals and seed dormancy
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Observations suggest that lineage-specific evolution of MAX2 may have given rise to specialized responses to these signaling molecules, and that this signaling system could have an ancient origin. Expand
KAI2- and MAX2-mediated responses to karrikins and strigolactones are largely independent of HY5 in Arabidopsis seedlings.
TLDR
It is shown that overexpression of KAI2 is sufficient to enhance responses to both karrikins and GR24 in wild-type seedlings, and that Kai2 overexposure partially suppresses the hy5 long hypocotyl phenotype, suggesting that K AI2 and MAX2 define a regulatory pathway that largely operates independently of HY5 to mediate seedling responses to abiotic signals such as smoke and light. Expand
KAI 2-and MAX 2-Mediated Responses to Karrikins and Strigolactones Are Largely Independent of HY 5 in Arabidopsis Seedlings
Karrikins are butenolide compounds released from burning vegetation that stimulate seed germination and enhance seedling photomorphogenesis. Strigolactones are structurally similar plant hormonesExpand
The karrikin response system of Arabidopsis.
TLDR
The KAI2 system appears to be present throughout angiosperms, implying a fundamentally important function in plant biology, and new results show that the proposed endogenous signalling compound is not produced by the known strigolactone biosynthesis pathway via carlactone. Expand
Specialisation within the DWARF14 protein family confers distinct responses to karrikins and strigolactones in Arabidopsis
TLDR
The results support the existence of an endogenous, butenolide-based signalling mechanism that is distinct from the strigolactone pathway, providing a molecular basis for the adaptive response of plants to smoke. Expand
Functional redundancy in the control of seedling growth by the karrikin signaling pathway
TLDR
Evidence that SMXL2 controls hypocotyl growth and expression of the KAR/SL transcriptional markers KUF1, IAA1, and DLK2 redundantly with SMAX1 is presented, supporting the model that karrikin and strigolactone responses are mediated by distinct subclades of the SMXL family, and further the case for parallel butenolide signaling pathways that evolved through ancient KAI2 and SMXL duplications. Expand
The karrikin signaling regulator SMAX1 controls Lotus japonicus root and root hair development by suppressing ethylene biosynthesis
TLDR
A connection between KAR/KL and ethylene signaling is revealed in which the Karrikin signaling module (KAI2–MAX2–SMAX1) regulates the biosynthesis of ethylene to fine-tune root and root hair development, which are important for seedling establishment at the beginning of the plant life cycle. Expand
The F-box protein MAX2 contributes to resistance to bacterial phytopathogens in Arabidopsis thaliana
TLDR
The results suggest that MAX2 previously characterized for its role in regulation of polar auxin transport in Arabidopsis, and thus plant development also significantly influences plant disease resistance. Expand
A Selaginella moellendorffii Ortholog of KARRIKIN INSENSITIVE2 Functions in Arabidopsis Development but Cannot Mediate Responses to Karrikins or Strigolactones[OPEN]
TLDR
It is concluded that KAI2, and most likely the endogenous signal to which it responds, has been conserved since the divergence of lycophytes and angiosperm lineages, despite their major developmental and morphogenic differences. Expand
SMAX1-LIKE/D53 Family Members Enable Distinct MAX2-Dependent Responses to Strigolactones and Karrikins in Arabidopsis
TLDR
It is proposed that functional diversification within the SMXL family enabled responses to different butenolide signals through a shared regulatory mechanism. Expand
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TLDR
A role for karrikins is revealed in priming light responses in the emerging seedling, and the influence of kAR1 on postfire ecology may not be limited to germination recruitment. Expand
Karrikins Discovered in Smoke Trigger Arabidopsis Seed Germination by a Mechanism Requiring Gibberellic Acid Synthesis and Light1[W][OA]
TLDR
It is demonstrated that Arabidopsis (Arabidopsis thaliana), an ephemeral of the temperate northern hemisphere that has never, to the authors' knowledge, been reported to be responsive to fire or smoke, rapidly and sensitively perceives karrikins and may have greater significance among angiosperms than previously realized. Expand
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TLDR
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TLDR
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TLDR
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TLDR
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TLDR
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