Evidence that KARRIKIN-INSENSITIVE2 (KAI2) Receptors may Perceive an Unknown Signal that is not Karrikin or Strigolactone
Caitlin E. Conn,David C. Nelson +1 more
TLDR
It is demonstrated that evolutionarily conserved KAI2c genes from two parasite species rescue multiple phenotypes of the Arabidopsis kai2 mutant, unlike karrikin-, and strigolactone-specific K AI2 paralogs.Abstract:
The α/β-hydrolases KAI2 and D14 are paralogous receptors for karrikins and strigolactones, two classes of plant growth regulators with butenolide moieties. KAI2 and D14 act in parallel signaling pathways that share a requirement for the F-box protein MAX2, but produce distinct growth responses by regulating different members of the SMAX1-LIKE/D53 family. kai2 and max2 mutants share seed germination, seedling growth, leaf shape, and petiole orientation phenotypes that are not found in d14 or SL-deficient mutants. This implies that KAI2 recognizes an unknown, endogenous signal, herein termed KAI2 ligand (KL). Recent studies of ligand-specificity among KAI2 paralogs in basal land plants and root parasitic plants suggest that karrikin and strigolactone perception may be evolutionary adaptations of KL receptors. Here we demonstrate that evolutionarily conserved KAI2c genes from two parasite species rescue multiple phenotypes of the Arabidopsis kai2 mutant, unlike karrikin-, and strigolactone-specific KAI2 paralogs. We hypothesize that KAI2c proteins recognize KL, which could be an undiscovered hormone.read more
Citations
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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
Plant Signaling and Metabolic Pathways Enabling Arbuscular Mycorrhizal Symbiosis.
TL;DR: An overview of the molecular program for AM symbiosis is provided and an exciting coalescence of genome mining, lipid profiling, and tracer studies collectively has led to the conclusion that AM fungi are fatty acid auxotrophs and that plants provide their fungal endosymbionts with fatty acids.
Journal ArticleDOI
The karrikin receptor KAI2 promotes drought resistance in Arabidopsis thaliana.
Weiqiang Li,Kien Huu Nguyen,Ha Duc Chu,Chien Van Ha,Yasuko Watanabe,Yuriko Osakabe,Marco Antonio Leyva-González,Mayuko Sato,Kiminori Toyooka,Laura Voges,Maho Tanaka,Mohammad Golam Mostofa,Motoaki Seki,Mitsunori Seo,Shinjiro Yamaguchi,David C. Nelson,Chunjie Tian,Luis Herrera-Estrella,Lam-Son Phan Tran +18 more
TL;DR: It is discovered that mutations in KARRIKIN INSENSITIVE2 (KAI2), encoding the proposed karrikin receptor, result in hypersensitivity to water deprivation, and suggest that chemical or genetic manipulation of KAI2 and D14 signaling may provide novel ways to improve drought resistance.
Journal ArticleDOI
SMAX1/SMXL2 regulate root and root hair development downstream of KAI2-mediated signalling in Arabidopsis.
José Antonio Villaécija-Aguilar,Maxime Hamon-Josse,Samy Carbonnel,Samy Carbonnel,Annika Kretschmar,Christian Schmidt,Corinna Dawid,Tom Bennett,Tom Bennett,Caroline Gutjahr,Caroline Gutjahr +10 more
TL;DR: The results demonstrate that the KAI2 signalling pathway is an important new regulator of root hair and root development in Arabidopsis and lay an important basis for research into a molecular understanding of how very similar and partially overlapping hormone signalling pathways regulate different phenotypic outputs.
Journal ArticleDOI
Functional redundancy in the control of seedling growth by the karrikin signaling pathway.
TL;DR: 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.
References
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Journal ArticleDOI
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
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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.
Journal ArticleDOI
Inhibition of shoot branching by new terpenoid plant hormones
Mikihisa Umehara,Atsushi Hanada,Satoko Yoshida,Kohki Akiyama,Tomotsugu Arite,Noriko Takeda-Kamiya,Hiroshi Magome,Yuji Kamiya,Ken Shirasu,Koichi Yoneyama,Junko Kyozuka,Shinjiro Yamaguchi +11 more
TL;DR: It is proposed that strigolactones act as a new hormone class—or their biosynthetic precursors—in regulating above-ground plant architecture, and also have a function in underground communication with other neighbouring organisms.
Journal ArticleDOI
The Path from β-Carotene to Carlactone, a Strigolactone-Like Plant Hormone
Adrian Alder,Muhammad Jamil,Mattia Marzorati,Mark Bruno,Martina Vermathen,Peter Bigler,Sandro Ghisla,Harro J. Bouwmeester,Peter Beyer,Salim Al-Babili +9 more
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Journal ArticleDOI
A Compound from Smoke That Promotes Seed Germination
TL;DR: It is shown that butenolide 3-methyl-2H-furo[2,3-c]pyran-2-one promotes germination of a number of plant species at a level similar to that observed with plant-derived smoke water.
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