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https://www.readbyqxmd.com/read/28789611/role-of-the-gras-transcription-factor-ata-ram1-in-the-transcriptional-reprogramming-of-arbuscular-mycorrhiza-in-petunia-hybrida
#1
Mélanie K Rich, Pierre-Emmanuel Courty, Christophe Roux, Didier Reinhardt
BACKGROUND: Development of arbuscular mycorrhiza (AM) requires a fundamental reprogramming of root cells for symbiosis. This involves the induction of hundreds of genes in the host. A recently identified GRAS-type transcription factor in Petunia hybrida, ATA/RAM1, is required for the induction of host genes during AM, and for morphogenesis of the fungal endosymbiont. To better understand the role of RAM1 in symbiosis, we set out to identify all genes that depend on activation by RAM1 in mycorrhizal roots...
August 8, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28758909/exogenous-gr24-alleviates-cadmium-toxicity-by-reducing-cadmium-uptake-in-switchgrass-panicum-virgatum-seedlings
#2
Zhenglan Tai, Xinqiang Yin, Zhigang Fang, Gaoling Shi, Laiqing Lou, Qingsheng Cai
Strigolactones (SLs) are classified into plant hormones, playing a key role as a mediator of plant growth in response to several abiotic stresses, including drought and salinity. However, the role of SLs in cadmium (Cd)-induced stress to plants is still unknown. The physiological responses of switchgrass (Panicum virgatum) stressed in 10 μmol L(-1) Cd to exogenous synthetic SLs analog, GR24 were studied in hydroponics. The Cd stress significantly caused the adverse effects on plant growth and root morphology, inhibited photosynthesis, but boosted lipid peroxidation of Switchgrass seedlings...
July 29, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28751316/determining-the-site-of-action-of-strigolactones-during-nodulation
#3
Erin L McAdam, Cassandra Hugill, Sebastien Fort, Eric Samian, Sylvain Cottaz, Noel W Davies, James B Reid, Eloise Foo
Strigolactones (SLs) influence the ability of legumes to associate with nitrogen-fixing bacteria. In this study we determine the precise stage at which SLs influence nodulation. We show that SLs promote infection thread formation, as a null SL-deficient pea (Pisum sativum L.) mutant forms significantly less infection threads than wild type plants and this reduction can be overcome by the application of the synthetic SL GR24. We found no evidence that SLs influence physical events in the plant before or after infection thread formation, since SL-deficient plants displayed a similar ability to induce root hair curling in response to rhizobia or lipochito-oligosaccharides (LCOs) and SL-deficient nodules appear to fix nitrogen at a similar rate to wild type plants...
July 27, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28690842/chemical-genetics-and-strigolactone-perception
#4
REVIEW
Shelley Lumba, Michael Bunsick, Peter McCourt
Strigolactones (SLs) are a collection of related small molecules that act as hormones in plant growth and development. Intriguingly, SLs also act as ecological communicators between plants and mycorrhizal fungi and between host plants and a collection of parasitic plant species. In the case of mycorrhizal fungi, SLs exude into the soil from host roots to attract fungal hyphae for a beneficial interaction. In the case of parasitic plants, however, root-exuded SLs cause dormant parasitic plant seeds to germinate, thereby allowing the resulting seedling to infect the host and withdraw nutrients...
2017: F1000Research
https://www.readbyqxmd.com/read/28676963/knocking-out-of-carotenoid-catabolic-genes-in-rice-fails-to-boost-carotenoid-accumulation-but-reveals-a-mutation-in-strigolactone-biosynthesis
#5
Xiaoyu Yang, Lei Chen, Junxian He, Weichang Yu
Targeted mutations in five carotenoid catabolism genes failed to boost carotenoid accumulation in rice seeds, but produced dwarf and high tillering mutants when OsCCD7 gene was knocked out. Carotenoids play an important role in human diet as a source of vitamin A. Rice is a major staple food in Asia, but does not accumulate carotenoids in the endosperm because of the low carotenoid biosynthesis or the degradation in metabolism. In this study, the CRISPR/Cas9 system was investigated in the targeted knockout of five rice carotenoid catabolic genes (OsCYP97A4, OsDSM2, OsCCD4a, OsCCD4b and OsCCD7) and in an effort to increase β-carotene accumulation in rice endosperm...
July 4, 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/28676802/a-taylor-made-design-of-phenoxyfuranone-type-strigolactone-mimic
#6
Kosuke Fukui, Daichi Yamagami, Shinsaku Ito, Tadao Asami
Strigolactones are a class of plant hormones that inhibit axillary bud outgrowth and are released from plant roots to act as a rhizosphere communication signal. The Orobanchaceae parasitic plant Striga hermonthica perceives strigolactone as its germination signal, indicating host presence. After germination, the Striga plant parasitises the host plant and suppresses host growth by draining photosynthetic products, water and other essential nutrients. Because of this way of life, this parasite threatens crop production in sub-Saharan Africa with infestation in crop fields and crop devastation...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28662667/evolution-of-strigolactone-receptors-by-gradual-neo-functionalization-of-kai2-paralogues
#7
Rohan Bythell-Douglas, Carl J Rothfels, Dennis W D Stevenson, Sean W Graham, Gane Ka-Shu Wong, David C Nelson, Tom Bennett
BACKGROUND: Strigolactones (SLs) are a class of plant hormones that control many aspects of plant growth. The SL signalling mechanism is homologous to that of karrikins (KARs), smoke-derived compounds that stimulate seed germination. In angiosperms, the SL receptor is an α/β-hydrolase known as DWARF14 (D14); its close homologue, KARRIKIN INSENSITIVE2 (KAI2), functions as a KAR receptor and likely recognizes an uncharacterized, endogenous signal ('KL'). Previous phylogenetic analyses have suggested that the KAI2 lineage is ancestral in land plants, and that canonical D14-type SL receptors only arose in seed plants; this is paradoxical, however, as non-vascular plants synthesize and respond to SLs...
June 29, 2017: BMC Biology
https://www.readbyqxmd.com/read/28643859/gibberellic-and-kaurenoic-hybrid-strigolactone-mimics-for-seed-germination-of-parasitic-weeds
#8
Rondinelle G Pereira, Antonio Cala, Mónica Fernández-Aparicio, José M G Molinillo, Maria A D Boaventura, Francisco A Macías
BACKGROUND: Parasitic weeds are widespread and they cause significant losses in important crops. Their germination requires the detection of crop-derived molecules such as strigolactones. Strigolactone mimics are germination-inducing molecules with potential to apply the suicidal germination strategy for seed bank control of parasitic weeds. RESULTS: Attachment of the D-ring, which is instrumental in the germination process of seeds of parasitic weeds, has been carried out to gibberellin (GA3 ) and kaurenoic as the scaffold...
June 23, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28630893/a-d53-repression-motif-induces-oligomerization-of-topless-corepressors-and-promotes-assembly-of-a-corepressor-nucleosome-complex
#9
Honglei Ma, Jingbo Duan, Jiyuan Ke, Yuanzheng He, Xin Gu, Ting-Hai Xu, Hong Yu, Yonghong Wang, Joseph S Brunzelle, Yi Jiang, Scott B Rothbart, H Eric Xu, Jiayang Li, Karsten Melcher
TOPLESS are tetrameric plant corepressors of the conserved Tup1/Groucho/TLE (transducin-like enhancer of split) family. We show that they interact through their TOPLESS domains (TPDs) with two functionally important ethylene response factor-associated amphiphilic repression (EAR) motifs of the rice strigolactone signaling repressor D53: the universally conserved EAR-3 and the monocot-specific EAR-2. We present the crystal structure of the monocot-specific EAR-2 peptide in complex with the TOPLESS-related protein 2 (TPR2) TPD, in which the EAR-2 motif binds the same TPD groove as jasmonate and auxin signaling repressors but makes additional contacts with a second TPD site to mediate TPD tetramer-tetramer interaction...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28598371/new-strigolactone-mimics-as-exogenous-signals-for-rhizosphere-organisms
#10
Florin Oancea, Emilian Georgescu, Radoslava Matusova, Florentina Georgescu, Alina Nicolescu, Iuliana Raut, Maria-Luiza Jecu, Marius-Constantin Vladulescu, Lucian Vladulescu, Calin Deleanu
The importance of strigolactones in plant biology prompted us to synthesize simplified strigolactone mimics effective as exogenous signals for rhizosphere organisms. New strigolactone mimics easily derived from simple and available starting materials in significant amounts were prepared and fully characterized. These compounds contain an aromatic or heterocyclic ring, usually present in various bioactive molecules, connected by an ether link to a furan-2-one moiety. The new synthesized strigolactone mimics were confirmed to be active on plant pathogenic fungi and parasitic weed seeds...
June 9, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28598262/strigolactones-in-the-rhizosphere-friend-or-foe
#11
Carolien De Cuyper, Sofie Goormachtig
Strigolactones are well-known endogenous plant hormones that play a major role in planta by influencing different physiological processes. Moreover, ex planta, strigolactones are important signaling molecules in root exudates and function as host detection cues to launch mutualistic interactions with arbuscular mycorrhizal fungi in the rhizosphere. However, parasitic plants belonging to the Orobanchaceae family hijacked this communication system to stimulate their seed germination when in close proximity to the roots of a suitable host...
September 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28558130/strigolactones-karrikins-and-beyond
#12
REVIEW
Carolien De Cuyper, Sylwia Struk, Lukas Braem, Kris Gevaert, Geert De Jaeger, Sofie Goormachtig
The plant hormones strigolactones are synthesized from carotenoids and signal via the α/β hydrolase DWARF 14 (D14) and the F-box protein MORE AXILLARY GROWTH 2 (MAX2). Karrikins, molecules produced upon fire, share MAX2 for signalling, but depend on the D14 paralog KARRIKIN INSENSITIVE 2 (KAI2) for perception with strong evidence that the MAX2-KAI2 protein complex might also recognize so far unknown plant-made karrikin-like molecules. Thus, the phenotypes of the max2 mutants are the complex consequence of a loss of both D14-dependent and KAI2-dependent signalling, hence, the reason why some biological roles, attributed to strigolactones based on max2 phenotypes, could never be observed in d14 or in the strigolactone-deficient max3 and max4 mutants...
May 30, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28526703/mir156-targeted-sbp-box-transcription-factors-interact-with-dwarf53-to-regulate-teosinte-branched1-and-barren-stalk1-expression-in-bread-wheat
#13
Jie Liu, Xiliu Cheng, Pan Liu, Jiaqiang Sun
Genetic and environmental factors affect bread wheat (Triticum aestivum) plant architecture, which determines grain yield. In this study, we demonstrate that miR156 controls bread wheat plant architecture. We show that overexpression of tae-miR156 in bread wheat cultivar Kenong199 leads to increased tiller number and severe defects in spikelet formation, probably due to the tae-miR156-mediated repression of a group of SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) genes. Furthermore, we found that the expression of two genes TEOSINTE BRANCHED1 (TaTB1) and BARREN STALK1 (TaBA1), whose orthologous genes in diverse plant species play conserved roles in regulating plant architecture, is markedly reduced in the tae-miR156-OE bread wheat plants...
July 2017: Plant Physiology
https://www.readbyqxmd.com/read/28514432/the-perception-of-strigolactones-in-vascular-plants
#14
REVIEW
Shelley Lumba, Duncan Holbrook-Smith, Peter McCourt
Small-molecule hormones play central roles in plant development, ranging from cellular differentiation and organ formation to developmental response instruction in changing environments. A recently discovered collection of related small molecules collectively called strigolactones are of particular interest, as these hormones also function as ecological communicators between plants and fungi and between parasitic plants and their hosts. Advances from model plant systems have begun to unravel how, as a hormone, strigolactone is perceived and transduced...
May 17, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28495334/found-in-translation-applying-lessons-from-model-systems-to-strigolactone-signaling-in-parasitic-plants
#15
REVIEW
Shelley Lumba, Asrinus Subha, Peter McCourt
Strigolactones (SLs) are small molecules that act as endogenous hormones to regulate plant development as well as exogenous cues that help parasitic plants to infect their hosts. Given that parasitic plants are experimentally challenging systems, researchers are using two approaches to understand how they respond to host-derived SLs. The first involves extrapolating information on SLs from model genetic systems to dissect their roles in parasitic plants. The second uses chemicals to probe SL signaling directly in the parasite Striga hermonthica...
May 9, 2017: Trends in Biochemical Sciences
https://www.readbyqxmd.com/read/28471323/enhancements-in-sucrose-biosynthesis-capacity-affect-shoot-branching-in-arabidopsis
#16
Kumi Otori, Masahiro Tamoi, Noriaki Tanabe, Shigeru Shigeoka
We previously demonstrated that transgenic tobacco plants expressing cyanobacterial fructose-1,6-/sedoheptulose-1,7-bisphosphatase in the cytosol increased the number of lateral shoots and leaves at elevated CO2 levels. These findings suggest that alterations in carbon partitioning affect the development of shoot branching. In order to elucidate the underlying mechanisms at the molecular level, we generated transgenic Arabidopsis plants overexpressing cyanobacterial fructose-1,6-bisphosphatase-II in the cytosol (AcF)...
August 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28470184/striga-resistance-cloak-the-strigolactone
#17
Jun Lyu
No abstract text is available yet for this article.
May 4, 2017: Nature Plants
https://www.readbyqxmd.com/read/28470165/striga-resistance-cloak-the-strigolactone
#18
Jun Lyu
No abstract text is available yet for this article.
May 4, 2017: Nature Plants
https://www.readbyqxmd.com/read/28422493/triazolide-strigolactone-mimics-influence-root-development-in-arabidopsis
#19
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
#20
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 (Oryza sativa) and identified GA as, to our knowledge, a novel SL-regulating molecule...
June 2017: Plant Physiology
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