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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 the present 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, a 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 HvD14 protein...
April 27, 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 Waters, Yueming K Sun, Brian W Skelton, Kingsley W Dixon, Emilio L Ghisalberti, Gavin Flematti, Steven Smith
Two α/β-fold hydrolases, KAI2 and AtD14, are necessary for responses to karrikins and strigolactones in Arabidopsis thaliana. While KAI2 mediates responses to karrikins and some strigolactone analogues, AtD14 mediates strigolactone but not karrikin responses. To further determine the specificity of these proteins, we assessed the ability of naturally occurring deoxystrigolactones (deoxySLs) to inhibit Arabidopsis hypocotyl elongation, regulate seedling gene expression, suppress outgrowth of secondary inflorescences, and promote seed germination...
May 7, 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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