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strigolactone

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https://www.readbyqxmd.com/read/28422493/triazolide-strigolactone-mimics-influence-root-development-in-arabidopsis
#1
Marcela Dvorakova, Petr Soudek, Tomas Vanek
Strigolactones are the most recently recognized class of phytohormones, which are also known to establish plant symbiosis with arbuscular mycorhizal fungi or induce germination of parasitic plants. Their relatively complex structures and low stability urgently calls for simple derivatives with maintained biological function. We have prepared a series of triazolide strigolactone mimics and studied their ability to affect root development of Arabidopsis thaliana. The strigolactone mimics significantly induced root elongation and lateral root formation while resembling the effect of the reference compound GR24...
April 19, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28404726/regulation-of-strigolactone-biosynthesis-by-gibberellin-signaling
#2
Shinsaku Ito, Daichi Yamagami, Mikihisa Umehara, Atsushi Hanada, Satoko Yoshida, Yasuyuki Sasaki, Shunsuke Yajima, Junko Kyozuka, Miyako Ueguchi-Tanaka, Makoto Matsuoka, Ken Shirasu, Shinjiro Yamaguchi, Tadao Asami
Strigolactones (SLs) are a class of plant hormones that regulate diverse physiological processes, including shoot branching and root development. They also act as rhizosphere signaling molecules to stimulate the germination of root parasitic weeds and the branching of arbuscular mycorrhizal fungi. Although various types of cross-talk between SLs and other hormones have been reported in physiological analyses, the cross-talk between gibberellin (GA) and SLs is poorly understood. We screened for chemicals that regulate the level of SLs in rice and identified GA as a novel SL-regulating molecule...
April 12, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28400173/strigolactones-in-plant-interactions-with-beneficial-and-detrimental-organisms-the-yin-and-yang
#3
REVIEW
Juan A López-Ráez, Ken Shirasu, Eloise Foo
Strigolactones (SLs) are plant hormones that have important roles as modulators of plant development. They were originally described as ex planta signaling molecules in the rhizosphere that induce the germination of parasitic plants, a role that was later linked to encouraging the beneficial symbiosis with arbuscular mycorrhizal (AM) fungi. Recently, the focus has shifted to examining the role of SLs in plant-microbe interactions, and has revealed roles for SLs in the association of legumes with nitrogen-fixing rhizobacteria and in interactions with disease-causing pathogens...
April 8, 2017: Trends in Plant Science
https://www.readbyqxmd.com/read/28396420/mutation-in-sorghum-low-germination-stimulant-1-alters-strigolactones-and-causes-striga-resistance
#4
Daniel Gobena, Mahdere Shimels, Patrick J Rich, Carolien Ruyter-Spira, Harro Bouwmeester, Satish Kanuganti, Tesfaye Mengiste, Gebisa Ejeta
Striga is a major biotic constraint to sorghum production in semiarid tropical Africa and Asia. Genetic resistance to this parasitic weed is the most economically feasible control measure. Mutant alleles at the LGS1 (LOW GERMINATION STIMULANT 1) locus drastically reduce Striga germination stimulant activity. We provide evidence that the responsible gene at LGS1 codes for an enzyme annotated as a sulfotransferase and show that functional loss of this gene results in a change of the dominant strigolactone (SL) in root exudates from 5-deoxystrigol, a highly active Striga germination stimulant, to orobanchol, an SL with opposite stereochemistry...
April 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28392795/the-role-of-endogenous-strigolactones-and-their-interaction-with-aba-during-the-infection-process-of-the-parasitic-weed-phelipanche-ramosa-in-tomato-plants
#5
Xi Cheng, Kristýna Floková, Harro Bouwmeester, Carolien Ruyter-Spira
The root parasitic plant species Phelipanche ramosa, branched broomrape, causes severe damage to economically important crops such as tomato. Its seed germination is triggered by host-derived signals upon which it invades the host root. In tomato, strigolactones (SLs) are the main germination stimulants for P. ramosa. Therefore, the development of low SL-producing lines may be an approach to combat the parasitic weed problem. However, since SLs are also a plant hormone controlling many aspects of plant development, SL deficiency may also have an effect on post-germination stages of the infection process, during the parasite-host interaction...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28392107/strigolactone-and-karrikin-independent-smxl-proteins-are-central-regulators-of-phloem-formation
#6
Eva-Sophie Wallner, Vadir López-Salmerón, Ilya Belevich, Gernot Poschet, Ilona Jung, Karin Grünwald, Iris Sevilem, Eija Jokitalo, Rüdiger Hell, Yrjö Helariutta, Javier Agustí, Ivan Lebovka, Thomas Greb
Plant stem cell niches, the meristems, require long-distance transport of energy metabolites and signaling molecules along the phloem tissue. However, currently it is unclear how specification of phloem cells is controlled. Here we show that the genes SUPPRESSOR OF MAX2 1-LIKE3 (SMXL3), SMXL4, and SMXL5 act as cell-autonomous key regulators of phloem formation in Arabidopsis thaliana. The three genes form an uncharacterized subclade of the SMXL gene family that mediates hormonal strigolactone and karrikin signaling...
March 28, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28289131/brc1-expression-regulates-bud-activation-potential-but-is-not-necessary-or-sufficient-for-bud-growth-inhibition-in-arabidopsis
#7
Madeleine Seale, Tom Bennett, Ottoline Leyser
The degree of shoot branching in Arabidopsis is determined by the activation of axillary buds. Bud activity is regulated by diverse environmental and developmental signals, often mediated via plant hormones including auxin, strigolactone and cytokinin. The transcription factor, BRANCHED1 (BRC1), has been proposed to integrate these regulatory signals. This idea is based on increased branching in brc1 mutants, the effects of bud-regulating hormones on BRC1 expression, and a general correlation between BRC1 expression and bud growth inhibition...
March 13, 2017: Development
https://www.readbyqxmd.com/read/28263675/in-silico-analysis-of-3-expansin-gene-promoters-reveals-2-hubs-controlling-light-and-cytokinins-response-during-bud-outgrowth
#8
Hanaé Roman, Tiffanie Girault, José Le Gourrierec, Nathalie Leduc
Bud outgrowth is under the intricate control of environmental and endogenous factors. In a recent paper, (1) we demonstrated that light perceived by Rosa buds triggers cytokinins (CK) synthesis within 3 hours in the adjacent node followed by their transport to the bud. There, CK control expression of a set of major genes (strigolactones-, auxin-, sugar sink strength-, cells division and elongation-related genes) leading to bud outgrowth in light. Conversely, under dark condition, CK accumulation and transport to the bud are repressed and no bud outgrowth occurs...
February 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28262967/strigolactone-biosynthesis-is-evolutionarily-conserved-regulated-by-phosphate-starvation-and-contributes-to-resistance-against-phytopathogenic-fungi-in-a-moss-physcomitrella-patens
#9
Eva L Decker, Adrian Alder, Stefan Hunn, Jenny Ferguson, Mikko T Lehtonen, Bjoern Scheler, Klaus L Kerres, Gertrud Wiedemann, Vajiheh Safavi-Rizi, Steffen Nordzieke, Aparna Balakrishna, Lina Baz, Javier Avalos, Jari P T Valkonen, Ralf Reski, Salim Al-Babili
In seed plants, strigolactones (SLs) regulate architecture and induce mycorrhizal symbiosis in response to environmental cues. SLs are formed by combined activity of the carotenoid cleavage dioxygenases (CCDs) 7 and 8 from 9-cis-β-carotene, leading to carlactone that is converted by cytochromes P450 (clade 711; MAX1 in Arabidopsis) into various SLs. As Physcomitrella patens possesses CCD7 and CCD8 homologs but lacks MAX1, we investigated if PpCCD7 together with PpCCD8 form carlactone and how deletion of these enzymes influences growth and interactions with the environment...
March 6, 2017: New Phytologist
https://www.readbyqxmd.com/read/28215609/zealactones-novel-natural-strigolactones-from-maize
#10
Tatsiana V Charnikhova, Katharina Gaus, Alexandre Lumbroso, Mark Sanders, Jean-Paul Vincken, Alain De Mesmaeker, Carolien P Ruyter-Spira, Claudio Screpanti, Harro J Bouwmeester
In the root exudate and root extracts of maize hybrid cv NK Falkone seven putative strigolactones were detected using UPLC-TQ-MS-MS. All seven compounds displayed MS-MS-fragmentation common for strigolactones and particularly the presence of a fragment of m/z 97 Da, which may indicate the presence of the so-called D-ring, suggests they are strigolactones. The levels of all these putative strigolactones increased upon phosphate starvation and decreased upon fluridone (carotenoid biosynthesis inhibitor) treatment, both of which are a common response for strigolactones...
May 2017: Phytochemistry
https://www.readbyqxmd.com/read/28186640/insights-into-the-formation-of-carlactone-from-in-depth-analysis-of-the-ccd8-catalyzed-reactions
#11
Mark Bruno, Martina Vermathen, Adrian Alder, Florian Wüst, Patrick Schaub, Rob van der Steen, Peter Beyer, Sandro Ghisla, Salim Al-Babili
Strigolactones are a new class of phytohormones synthesized from carotenoids via carlactone. The complex structure of carlactone is not easily deducible from its precursor, a cis-configured β-carotene cleavage product, and is thus formed via a poorly understood series of reactions and molecular rearrangements, all catalyzed by only one enzyme, the carotenoid cleavage dioxygenase 8 (CCD8). Moreover, the reactions leading to carlactone are expected to form a second, yet unidentified product. In this study, we used (13) C and (18) O-labeling to shed light on the reactions catalyzed by CCD8...
March 2017: FEBS Letters
https://www.readbyqxmd.com/read/28143400/the-carotenoid-biosynthetic-and-catabolic-genes-in-wheat-and-their-association-with-yellow-pigments
#12
Pasqualina Colasuonno, Maria Luisa Lozito, Ilaria Marcotuli, Domenica Nigro, Angelica Giancaspro, Giacomo Mangini, Pasquale De Vita, Anna Maria Mastrangelo, Nicola Pecchioni, Kelly Houston, Rosanna Simeone, Agata Gadaleta, Antonio Blanco
BACKGROUND: In plants carotenoids play an important role in the photosynthetic process and photo-oxidative protection, and are the substrate for the synthesis of abscisic acid and strigolactones. In addition to their protective role as antioxidants and precursors of vitamin A, in wheat carotenoids are important as they influence the colour (whiteness vs. yellowness) of the grain. Understanding the genetic basis of grain yellow pigments, and identifying associated markers provide the basis for improving wheat quality by molecular breeding...
January 31, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28128458/analysis-of-nicotiana-tabacum-pin-genes-identifies-ntpin4-as-a-key-regulator-of-axillary-bud-growth
#13
Xiaodong Xie, Guangyong Qin, Ping Si, Zhaopeng Luo, Junping Gao, Xia Chen, Jianfeng Zhang, Pan Wei, Qingyou Xia, Fucheng Lin, Jun Yang
The plant-specific PIN-FORMED (PIN) auxin efflux proteins have been well characterized in many plant species, where they are crucial in the regulation of auxin transport in various aspects of plant development. However, little is known about the exact roles of the PIN genes during plant development in Nicotiana species. This study investigated the PIN genes in tobacco (N. tabacum) and in two ancestral species (N. sylvestris and N. tomentosiformis). Genome-wide analysis of the N. tabacum genome identified 20 genes of the PIN family...
January 27, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28125281/strigolactone-signaling-and-evolution
#14
Mark T Waters, Caroline Gutjahr, Tom Bennett, David C Nelson
Strigolactones are a structurally diverse class of plant hormones that control many aspects of shoot and root growth. Strigolactones are also exuded by plants into the rhizosphere, where they promote symbiotic interactions with arbuscular mycorrhizal fungi and germination of root parasitic plants in the Orobanchaceae family. Therefore, understanding how strigolactones are made, transported, and perceived may lead to agricultural innovations as well as a deeper knowledge of how plants function. Substantial progress has been made in these areas over the past decade...
January 11, 2017: Annual Review of Plant Biology
https://www.readbyqxmd.com/read/28059066/shhtl7-is-a-non-canonical-receptor-for-strigolactones-in-root-parasitic-weeds
#15
Ruifeng Yao, Fei Wang, Zhenhua Ming, Xiaoxi Du, Li Chen, Yupei Wang, Wenhao Zhang, Haiteng Deng, Daoxin Xie
No abstract text is available yet for this article.
January 6, 2017: Cell Research
https://www.readbyqxmd.com/read/28050825/strigolactone-mediated-stimulation-of-secondary-xylem-proliferation-in-stems
#16
Javier Agusti
Secondary xylem (wood) accounts for a large proportion of the terrestrial biomass. Understanding how secondary xylem develops and proliferates is a challenge to enhance our capacities for biomass production. Recent reports revealed that the plant hormone strigolactone is key for the development of secondary xylem. Here, I describe a protocol for strigolactone-mediated stimulation of secondary xylem proliferation in stems. The protocol has been tested in Arabidopsis and Eucalyptus and can be adjusted to other species...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28045179/heck-functionalization-of-an-asymmetric-aza-bodipy-core-synthesis-of-far-red-infrared-probes-for-bioimaging-applications
#17
Stefano Parisotto, Beatrice Lace, Emma Artuso, Chiara Lombardi, Annamaria Deagostino, Roberto Scudu, Claudio Garino, Claudio Medana, Cristina Prandi
As part of our ongoing work on the synthesis of a new class of plant hormones named Strigolactones (SLs) and their analogues, we became interested in tracing bioactive molecules with red emitting BODIPY fluorophores in order to unravel signaling and distribution of SLs in plants. In this paper we report on an unprecedented Heck functionalization of azadipyrromethenes (aza-DIPY) which allows for the introduction of suitable functional groups to convert aza-BODIPY in bioconjugate complexes useful for untangling biological processes...
January 3, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28002608/ntbrc1-suppresses-axillary-branching-in-tobacco-after-decapitation
#18
Y L Gao, Z B Song, W Z Li, F C Jiao, R Wang, C J Huang, Y P Li, B W Wang
Axillary branching is controlled by a very complex mechanism involving various endogenous and environmental factors. Previous studies have shown that Tb1/BRC1 is the point of integration in the network of molecular mechanisms regulating axillary branching in plants. In this study, we cloned the Tb1/BRC1 ortholog, NtBRC1, from Nicotiana tabacum and functionally analyzed its role in the control of axillary branching in tobacco. Overexpression of NtBRC1 resulted in significant retardation of axillary branching, and downregulation of this gene resulted in significant acceleration of axillary branching after decapitation...
December 19, 2016: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/27994609/reporter-gene-facilitated-detection-of-compounds-in-arabidopsis-leaf-extracts-that-activate-the-karrikin-signaling-pathway
#19
Yueming K Sun, Gavin R Flematti, Steven M Smith, Mark T Waters
Karrikins are potent germination stimulants generated by the combustion of plant matter. Treatment of Arabidopsis with karrikins triggers a signaling process that is dependent upon a putative receptor protein KARRIKIN INSENSITIVE 2 (KAI2). KAI2 is a homolog of DWARF 14 (D14), the receptor for endogenous strigolactone hormones. Genetic analyses suggest that KAI2 also perceives endogenous signal(s) that are not strigolactones. Activation of KAI2 by addition of karrikins to Arabidopsis plants induces expression of transcripts including D14-LIKE 2 (DLK2)...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27909790/strigolactones-affect-tomato-hormone-profile-and-somatic-embryogenesis
#20
Yuanli Wu, Evgenia Dor, Joseph Hershenhorn
Exogenously applied GR24 affected somatic embryo formation and morphogenesis of strigolactone-deficient tomato mutant through cross-talk with auxins and cytokinins indicating involvement of SLs in the embryogenic process. Strigolactones (SLs) mediate the regulation of plant responses to the environment through cross-talk with other plant hormones, especially auxins. Auxins play a crucial role in coordinating the morphogenesis and development of plant reproductive organs, including the signal-transduction cascade leading to the reprogramming of gene-expression patterns before embryo formation...
December 1, 2016: Planta
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