Specialisation within the DWARF14 protein family confers distinct responses to karrikins and strigolactones in Arabidopsis

@article{Waters2012SpecialisationWT,
  title={Specialisation within the DWARF14 protein family confers distinct responses to karrikins and strigolactones in Arabidopsis},
  author={Mark T. Waters and David C. Nelson and Adrian Scaffidi and Gavin R. Flematti and Yueming K. Sun and Kingsley W. Dixon and Steven M. L. Smith},
  journal={Development},
  year={2012},
  volume={139},
  pages={1285 - 1295}
}
Karrikins are butenolides derived from burnt vegetation that stimulate seed germination and enhance seedling responses to light. Strigolactones are endogenous butenolide hormones that regulate shoot and root architecture, and stimulate the branching of arbuscular mycorrhizal fungi. Thus, karrikins and strigolactones are structurally similar but physiologically distinct plant growth regulators. In Arabidopsis thaliana, responses to both classes of butenolides require the F-box protein MAX2, but… 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
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
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 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
Divergent receptor proteins confer responses to different karrikins in two ephemeral weeds
TLDR
It is demonstrated that Brassica tournefortii differentially expresses three KA12 homologues, two of which rescue the Arabidopsis kai2-2 null mutant, and provided clear evidence that KAI2 is the receptor for karrikins, since specific amino acid substitutions near the active site change ligand specificity support differential ligand preferences. Expand
CYP707As are effectors of karrikin and strigolactone signaling pathways in Arabidopsis thaliana and parasitic plants.
TLDR
This study suggests that the lack of host-independent germination in obligate parasites is associated with an exacerbated CYP707A induction, and that CyP707As and WRKY33 are new players involved in a variety of strigolactone/karrikin responses. Expand
Comparing and Contrasting the Multiple Roles of Butenolide Plant Growth Regulators: Strigolactones and Karrikins in Plant Development and Adaptation to Abiotic Stresses
TLDR
The biosynthetic and signaling pathways of SLs and KARs are covered, their functions in plant growth and development are compared, and the effects of any crosstalk between SLs or Karrikins and other plant hormones at various stages of plant development are reviewed. Expand
Structural modelling and transcriptional responses highlight a clade of PpKAI2-LIKE genes as candidate receptors for strigolactones in Physcomitrella patens
TLDR
A set of P. patens KAI2-LIKE (PpKAI2L) genes may contribute to strigolactone perception, and it is predicted that a clade of PpK AI2L proteins have enlarged ligand-binding cavities, similar to D14, which is closely related to KARRIKIN INSENSITIVE2, a receptor of smoke-derived germination stimulants called karrikins. Expand
An allelic series at the KARRIKIN INSENSITIVE 2 locus of Arabidopsis thaliana decouples ligand hydrolysis and receptor degradation from downstream signalling
TLDR
It is demonstrated that the enzymatic and signalling functions of KAI2 can be decoupled, and important insights are provided into the mechanistic events that underpin butenolide signalling in plants. Expand
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TLDR
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TLDR
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