Specialisation within the DWARF14 protein family confers distinct responses to karrikins and strigolactones in Arabidopsis
Mark T. Waters,David C. Nelson,Adrian Scaffidi,Gavin R. Flematti,Yueming K. Sun,Kingsley W. Dixon,Steven M. Smith +6 more
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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.Abstract:
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 it remains unclear how discrete responses to karrikins and strigolactones are achieved. In rice, the DWARF14 protein is required for strigolactone-dependent inhibition of shoot branching. Here, we show that the Arabidopsis DWARF14 orthologue, AtD14, is also necessary for normal strigolactone responses in seedlings and adult plants. However, the AtD14 paralogue KARRIKIN INSENSITIVE 2 (KAI2) is specifically required for responses to karrikins, and not to strigolactones. Phylogenetic analysis indicates that KAI2 is ancestral and that AtD14 functional specialisation has evolved subsequently. Atd14 and kai2 mutants exhibit distinct subsets of max2 phenotypes, and expression patterns of AtD14 and KAI2 are consistent with the capacity to respond to either strigolactones or karrikins at different stages of plant development. We propose that AtD14 and KAI2 define a class of proteins that permit the separate regulation of karrikin and strigolactone signalling by MAX2. Our 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.read more
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D14–SCF D3 -dependent degradation of D53 regulates strigolactone signalling
Feng Zhou,Qibing Lin,Lihong Zhu,Yulong Ren,Kunneng Zhou,Nitzan Shabek,Fuqing Wu,Haibin Mao,Wei Dong,Lu Gan,Weiwei Ma,He Gao,Jun Chen,Chao Yang,Dan Wang,Junjie Tan,Xin Zhang,Xiuping Guo,Jiulin Wang,Ling Jiang,Xi Liu,Weiqi Chen,Jinfang Chu,Cunyu Yan,Kotomi Ueno,Shinsaku Ito,Tadao Asami,Zhijun Cheng,Jie Wang,Cailin Lei,Huqu Zhai,Chuanyin Wu,Haiyang Wang,Ning Zheng,Jianmin Wan +34 more
TL;DR: The combined genetic and biochemical data reveal that D53 acts as a repressor of the SL signalling pathway, whose hormone-induced degradation represents a key molecular link between SL perception and responses.
Journal ArticleDOI
DWARF 53 acts as a repressor of strigolactone signalling in rice
Liang Jiang,Xue Liu,Guosheng Xiong,Huihui Liu,Fulu Chen,Lei Wang,Xiangbing Meng,Guifu Liu,Hong Yu,Yundong Yuan,Wei Yi,Lihua Zhao,Honglei Ma,Yuanzheng He,Wu Zhongshan,Karsten Melcher,Qian Qian,H. Eric Xu,Yonghong Wang,Jiayang Li +19 more
TL;DR: The characterization of a dominant SL-insensitive rice (Oryza sativa) mutant dwarf 53 (d53) and the cloning of D53, which encodes a substrate of the SCFD3 ubiquitination complex and functions as a repressor of SL signalling are reported.
Journal ArticleDOI
DAD2 Is an α/β Hydrolase Likely to Be Involved in the Perception of the Plant Branching Hormone, Strigolactone
Cyril Hamiaux,Revel S.M. Drummond,Bart J. Janssen,Susan E. Ledger,Janine M. Cooney,Richard D. Newcomb,Richard D. Newcomb,Kimberley C. Snowden +7 more
TL;DR: Observations suggest that DAD2 acts to bind the mobile strigolactone signal and then interacts with PhMAX2A during catalysis to initiate an SCF-mediated signal transduction pathway.
Journal ArticleDOI
Strigolactone Signaling and Evolution.
TL;DR: This review focuses on the molecular mechanisms, core developmental roles, and evolutionary history of strigolactone signaling and proposes potential translational applications of strIGolactones research to agriculture.
Journal ArticleDOI
Strigolactone Can Promote or Inhibit Shoot Branching by Triggering Rapid Depletion of the Auxin Efflux Protein PIN1 from the Plasma Membrane
TL;DR: The phytohormone strigolactone balances shoot system growth by making auxin export harder to establish, thus modulating the auxin transport network.
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Plant sesquiterpenes induce hyphal branching in arbuscular mycorrhizal fungi
TL;DR: Strigolactones are a group of sesquiterpene lactones, previously isolated as seed-germination stimulants for the parasitic weeds Striga and Orobanche, and a synthetic analogue, GR24, induced extensive hyphal branching in germinating spores of the AM fungus Gigaspora margarita at very low concentrations.
Journal ArticleDOI
Strigolactone inhibition of shoot branching
Victoria Gomez-Roldan,Victoria Gomez-Roldan,Soraya Fermas,Philip B. Brewer,Virginie Puech-Pagès,Virginie Puech-Pagès,Elizabeth A. Dun,Jean-Paul Pillot,Fabien Létisse,Radoslava Matusova,Saida Danoun,Saida Danoun,Jean-Charles Portais,Harro J. Bouwmeester,Guillaume Bécard,Guillaume Bécard,Christine A. Beveridge,Catherine Rameau,Soizic Rochange,Soizic Rochange +19 more
TL;DR: Evidence is presented that carotenoid cleavage dioxygenase 8 shoot branching mutants of pea are strigolactone deficient and that strigOLactone application restores the wild-type branching phenotype to ccd8 mutants, and that other branching mutants previously characterized as lacking a response to the branching inhibition signal also lack striglactone response.
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Tomas Hruz,Oliver Laule,Gabor Szabo,Frans Wessendorp,Stefan Bleuler,Lukas Oertle,Peter Widmayer,Wilhelm Gruissem,Philip Zimmermann +8 more
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