title: Signalling and responses to strigolactones and karrikins.
abstract: Strigolactone (SL) and karrikin (KAR) signalling control many aspects of plant growth and development through similar mechanisms employing related α/β-fold hydrolase-receptors and a common F-box protein named MORE AXILARY GROWTH2 (MAX2) in Arabidopsis or DWARF3 (D3) in rice. D3 mediates SL-dependent ubiquitination and proteolysis of DWARF53 (D53) protein, thought to be involved in the control of gene expression, while a related protein SUPPRESSOR OF MAX2-1 (SMAX1) is implicated in the response to KAR in Arabidopsis. Different members of the D53/SMAX1 multigene family likely mediate different responses in plant growth and development. Analysis of responses to SL or KAR has identified many genes regulated by these compounds. Crosstalk with other signalling systems including light, hormones and abiotic stress has also been identified. Here we critically analyse how to progress towards a clearer understanding of the targets and functions of the SL and KAR signalling systems.
authors.affiliation: Centre of Excellence in Plant Energy Biology & School of Chemistry and Biochemistry, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia. Electronic address: steven.smith@uwa.edu.au.
authors.forename: Steven M
authors.initials: SM
authors.lastname: Smith
authors.affiliation: State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, No. 1 West Beichen Road, Chaoyang District, Beijing 100101, China.
authors.forename: Jiayang
authors.initials: J
authors.lastname: Li
mesh_terms: D017360:Arabidopsis / Q000254:growth & development / Q000502:physiology; D005663:Furans / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000502:physiology; D006575:Heterocyclic Compounds, 3-Ring / Q000378:metabolism*; D007783:Lactones / Q000378:metabolism*; D063245:Plant Development / Q000502:physiology; D010937:Plant Growth Regulators / Q000502:physiology*; D018521:Plant Physiological Phenomena; D011714:Pyrans / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology
chemical_list: C488803:3-methyl-2H-furo(2,3-c)pyran-2-one; D005663:Furans; D006575:Heterocyclic Compounds, 3-Ring; D007783:Lactones; D010937:Plant Growth Regulators; D011714:Pyrans