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Elena Sanchez, Emma Artuso, Chiara Lombardi, Ivan Visentin, Beatrice Lace, Wajeeha Saeed, Marco L Lolli, Piermichele Kobauri, Zahid Ali, Francesca Spyrakis, Pilar Cubas, Francesca Cardinale, Cristina Prandi
Strigolactones (SLs) are plant hormones with various functions in development, responses to stress, and interactions with (micro)organisms in the rhizosphere, including with seeds of parasitic plants. Their perception for hormonal functions requires an α,β-hydrolase belonging to the D14 clade in higher plants; perception of host-produced SLs by parasitic seeds relies on similar but phylogenetically distinct proteins (D14-like). D14 and D14-like proteins are peculiar receptors, because they cleave SLs before undergoing a conformational change that elicits downstream events...
April 23, 2018: Journal of Experimental Botany
Cyril Hamiaux, Revel S M Drummond, Zhiwei Luo, Hui Wen Lee, Prachi Sharma, Bart J Janssen, Nigel B Perry, William A Denny, Kimberley C Snowden
The strigolactone (SL) family of plant hormones regulates a broad range of physiological processes affecting plant growth and development and also plays essential roles in controlling interactions with parasitic weeds and symbiotic fungi. Recent progress elucidating details of SL biosynthesis, signaling, and transport offers many opportunities for discovering new plant-growth regulators via chemical interference. Here, using high-throughput screening and downstream biochemical assays, we identified N -phenylanthranilic acid derivatives as potent inhibitors of the SL receptors from petunia (DAD2), rice (OsD14), and Arabidopsis (AtD14)...
April 27, 2018: Journal of Biological Chemistry
Yonghong Zhang, Shuo Lv, Guodong Wang
Strigolactones (SLs) have been implicated in many plant biological processes, including growth and development and the acclimation to environmental stress. We recently reported that SLs intrinsically acted as prominent regulators in induction of stomatal closure. Here we present evidence that the effect of SLs on stotamal closure is not limited to Arabidopsis, and thus SLs could serve as common regulators in the modulation of stomatal apertures of various plant species. Nevertheless, TIS108, a SL-biosynthetic inhibitor, exerted no effect on stomatal apertures...
March 4, 2018: Plant Signaling & Behavior
Ruifeng Yao, Lei Wang, Yuwen Li, Li Chen, Suhua Li, Xiaoxi Du, Bing Wang, Jianbin Yan, Jiayang Li, Daoxin Xie
Strigolactones (SLs) act as an important class of phytohormones to regulate plant shoot branching, and also serve as rhizosphere signals to mediate interactions of host plants with soil microbes and parasitic weeds. SL receptors in dicots, such as DWARF14 in Arabidopsis (AtD14), RMS3 in pea, and ShHTL7 in Striga, serve as unconventional receptors that hydrolyze SLs into a D-ring-derived intermediate CLIM and irreversibly bind CLIM to trigger SL signal transduction. Here, we show that D14 from the monocot rice can complement Arabidopsis d14 mutant and interact with the SL signaling components in Arabidopsis...
April 23, 2018: Journal of Experimental Botany
Ruifeng Yao, Zhenhua Ming, Liming Yan, Suhua Li, Fei Wang, Sui Ma, Caiting Yu, Mai Yang, Li Chen, Linhai Chen, Yuwen Li, Chun Yan, Di Miao, Zhongyuan Sun, Jianbin Yan, Yuna Sun, Lei Wang, Jinfang Chu, Shilong Fan, Wei He, Haiteng Deng, Fajun Nan, Jiayang Li, Zihe Rao, Zhiyong Lou, Daoxin Xie
Classical hormone receptors reversibly and non-covalently bind active hormone molecules, which are generated by biosynthetic enzymes, to trigger signal transduction. The α/β hydrolase DWARF14 (D14), which hydrolyses the plant branching hormone strigolactone and interacts with the F-box protein D3/MAX2, is probably involved in strigolactone detection. However, the active form of strigolactone has yet to be identified and it is unclear which protein directly binds the active form of strigolactone, and in which manner, to act as the genuine strigolactone receptor...
August 25, 2016: Nature
Marek Marzec, Damian Gruszka, Piotr Tylec, Iwona Szarejko
In this study, the barley HvD14 gene encoding α/β hydrolase, which is involved in strigolactone (SL) signaling, was identified. Bioinformatics analysis revealed that the identified gene is an orthologue of the D14, AtD14 and PhDAD2 genes that have been described in rice, Arabidopsis thaliana and petunia, respectively. Using TILLING strategy, an hvd14.d mutant that carried the G725A transition, located in the second exon, was identified. This mutation led to the substitution of a highly conserved glycine-193 to glutamic acid in the conserved fragment of the α/β hydrolase domain of the HvD14 protein...
November 2016: Physiologia Plantarum
Gavin R Flematti, Adrian Scaffidi, Mark T Waters, Steven M Smith
Plants produce strigolactones with different structures and different stereospecificities which provides the potential for diversity and flexibility of function. Strigolactones (SLs) typically comprise a tricyclic ABC ring system linked through an enol-ether bridge to a butenolide D-ring. The stereochemistry of the butenolide ring is conserved but two alternative configurations of the B-C ring junction leads to two families of SLs, exemplified by strigol and orobanchol. Further modifications lead to production of many different strigolactones within each family...
June 2016: Planta
Shinsaku Ito, Ken Ito, Naoko Abeta, Ryo Takahashi, Yasuyuki Sasaki, Shunsuke Yajima
Strigolactones (SLs) are a group of terpenoid lactones found in plants that regulate diverse developmental phenomena. SLs are thought to be involved in the maintenance of phosphate homeostasis. In addition, SL signaling is required for the regulation of shoot branching by nitrogen supply in Arabidopsis. In this study, we evaluated the effects of SLs on nitrogen deficient-inducing phenomena (leaf senescence and reduction of plant weight) in Arabidopsis. SL-biosynthesis (max1-1) and SL-insensitive (atd14-1) mutants showed altered responses to nitrogen deficient in comparison with wild-type (WT) plants...
2016: Plant Signaling & Behavior
Satoko Abe, Aika Sado, Kai Tanaka, Takaya Kisugi, Kei Asami, Saeko Ota, Hyun Il Kim, Kaori Yoneyama, Xiaonan Xie, Toshiyuki Ohnishi, Yoshiya Seto, Shinjiro Yamaguchi, Kohki Akiyama, Koichi Yoneyama, Takahito Nomura
Strigolactones (SLs) stimulate seed germination of root parasitic plants and induce hyphal branching of arbuscular mycorrhizal fungi in the rhizosphere. In addition, they have been classified as a new group of plant hormones essential for shoot branching inhibition. It has been demonstrated thus far that SLs are derived from carotenoid via a biosynthetic precursor carlactone (CL), which is produced by sequential reactions of DWARF27 (D27) enzyme and two carotenoid cleavage dioxygenases CCD7 and CCD8. We previously found an extreme accumulation of CL in the more axillary growth1 (max1) mutant of Arabidopsis, which exhibits increased lateral inflorescences due to SL deficiency, indicating that CL is a probable substrate for MAX1 (CYP711A1), a cytochrome P450 monooxygenase...
December 16, 2014: Proceedings of the National Academy of Sciences of the United States of America
Adrian Scaffidi, Mark T Waters, Yueming K Sun, Brian W Skelton, Kingsley W Dixon, Emilio L Ghisalberti, Gavin R Flematti, Steven M Smith
Two α/β-fold hydrolases, KARRIKIN INSENSITIVE2 (KAI2) and Arabidopsis thaliana DWARF14 (AtD14), are necessary for responses to karrikins (KARs) and strigolactones (SLs) in Arabidopsis (Arabidopsis thaliana). Although KAI2 mediates responses to KARs and some SL analogs, AtD14 mediates SL but not KAR responses. To further determine the specificity of these proteins, we assessed the ability of naturally occurring deoxystrigolactones to inhibit Arabidopsis hypocotyl elongation, regulate seedling gene expression, suppress outgrowth of secondary inflorescences, and promote seed germination...
July 2014: Plant Physiology
Mark T Waters, Adrian Scaffidi, Yueming K Sun, Gavin R Flematti, Steven M Smith
Arabidopsis thaliana provides a powerful means to investigate the mode of action of karrikins, compounds produced during wildfires that stimulate germination of seeds of fire-following taxa. These studies have revealed close parallels between karrikin signalling and strigolactone signalling. The two perception systems employ similar mechanisms involving closely related α/β-fold hydrolases (KAI2 and AtD14) and a common F-box protein (MAX2). However, karrikins and strigolactones may be distinguished from each other and elicit different responses...
August 2014: Plant Journal: for Cell and Molecular Biology
Yuan Wang, Shiyong Sun, Wenjiao Zhu, Kunpeng Jia, Hongquan Yang, Xuelu Wang
Strigolactones (SLs), a class of the most recently identified terpenoid phytohormones, play essential roles in plant development, specifically in suppressing shoot branching. MAX2, a subunit of an SCF E3 ligase and a positive regulator that inhibits shoot branching, is likely a key SL signaling component. Here, we provide genetic and biochemical evidence to demonstrate that BES1 interacts with MAX2 and acts as its substrate to regulate SL-responsive gene expression. Additional AtD14, a putative receptor of SLs, can promote BES1 degradation...
December 23, 2013: Developmental Cell
Mark T Waters, David C Nelson, Adrian Scaffidi, Gavin R Flematti, Yueming K Sun, Kingsley W Dixon, Steven M Smith
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...
April 2012: Development
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