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strigolactone

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https://www.readbyqxmd.com/read/28932861/correction-recent-advances-in-the-synthesis-of-analogues-of-phytohormones-strigolactones-with-ring-closing-metathesis-as-a-key-step
#1
Chiara Lombardi, Emma Artuso, Eleonora Grandi, Marco Lolli, Francesca Spyrakis, Emanuele Priola, Cristina Prandi
Correction for 'Recent advances in the synthesis of analogues of phytohormones strigolactones with ring-closing metathesis as a key step' by Chiara Lombardi, et al., Org. Biomol. Chem., 2017, DOI: 10.1039/c7ob01917c.
September 21, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28922755/root-transcriptomic-responses-of-grafted-grapevines-to-heterogeneous-nitrogen-availability-depend-on-rootstock-genotype
#2
Noé Cochetel, Frédéric Escudié, Sarah Jane Cookson, Zhanwu Dai, Philippe Vivin, Pierre-François Bert, Mindy Stephania Muñoz, Serge Delrot, Christophe Klopp, Nathalie Ollat, Virginie Lauvergeat
In many fruit species, including grapevine, grafting is used to improve scion productivity and quality and to adapt the plant to environmental conditions. However, the mechanisms underlying the rootstock control of scion development are still poorly understood. The ability of rootstocks to regulate nitrogen uptake and assimilation may contribute to this control. A split-root system was used to grow heterografted grapevines and to investigate the molecular responses to changes in nitrate availability of two rootstocks known to affect scion growth differently...
July 10, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28900192/comparative-transcriptome-analysis-of-axillary-buds-in-response-to-the-shoot-branching-regulators-gibberellin-a3-and-6-benzyladenine-in-jatropha-curcas
#3
Jun Ni, Mei-Li Zhao, Mao-Sheng Chen, Bang-Zhen Pan, Yan-Bin Tao, Zeng-Fu Xu
Cytokinin (CK) is the primary hormone that positively regulates axillary bud outgrowth. However, in many woody plants, such as Jatropha curcas, gibberellin (GA) also promotes shoot branching. The molecular mechanisms underlying GA and CK interaction in the regulation of bud outgrowth in Jatropha remain unclear. To determine how young axillary buds respond to GA3 and 6-benzyladenine (BA), we performed a comparative transcriptome analysis of the young axillary buds of Jatropha seedlings treated with GA3 or BA...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28894457/strigolactones-biosynthesis-and-their-role-in-abiotic-stress-resilience-in-plants-a-critical-review
#4
REVIEW
Wajeeha Saeed, Saadia Naseem, Zahid Ali
Strigolactones (SLs), being a new class of plant hormones, play regulatory roles against abiotic stresses in plants. There are multiple hormonal response pathways, which are adapted by the plants to overcome these stressful environmental constraints to reduce the negative impact on overall crop plant productivity. Genetic modulation of the SLs could also be applied as a potential approach in this regard. However, endogenous plant hormones play central roles in adaptation to changing environmental conditions, by mediating growth, development, nutrient allocation, and source/sink transitions...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28884742/ipa1-a-direct-target-of-sl-signaling
#5
Stephanie C Kerr, Christine A Beveridge
The plant hormone strigolactone (SL) is important for many processes in plants, but its molecular mode of action has been difficult to elucidate. A new discovery has identified the SPL transcription factor, IPA1, as a crucial component directly involved in SL signaling.
September 8, 2017: Cell Research
https://www.readbyqxmd.com/read/28880031/recent-advances-in-the-synthesis-of-analogues-of-phytohormones-strigolactones-with-ring-closing-metathesis-as-a-key-step
#6
Chiara Lombardi, Emma Artuso, Eleonora Grandi, Marco Lolli, Francesca Spirakys, Emanuele Priola, Cristina Prandi
In this paper, we synthesized and evaluated the biological activity of structural analogues of natural strigolactones in which the butenolide D-ring has been replaced with a γ-lactam. The key step to obtain the α,β-unsaturated-γ-lactam was an RCM on suitably substituted amides. Strigolactones (SLs) are plant hormones with various developmental functions. As soil signaling chemicals, they are required for establishing beneficial mycorrhizal plant/fungus symbiosis. Beside these auxinic roles, recently SLs have been successfully investigated as antitumoral agents...
September 7, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28844847/strigolactones-and-gibberellins-a-new-couple-in-the-phytohormone-world
#7
Marek Marzec
Strigolactones (SLs) and gibberellins (GAs) are plant hormones that share some unique aspects of their perception and signalling pathways. Recent discoveries indicate that these two phytohormones may act together in processes of plant development and that SL biosynthesis is regulated by GAs.
August 24, 2017: Trends in Plant Science
https://www.readbyqxmd.com/read/28843889/physiological-and-antioxidant-responses-of-winter-wheat-cultivars-to-strigolactone-and-salicylic-acid-in-drought
#8
Mojde Sedaghat, Zeinolabedin Tahmasebi-Sarvestani, Yahya Emam, Ali Mokhtassi-Bidgoli
Strigolactones are considered as important regulators of plant growth and development. Recently positive regulatory influence of strigolactones in plant in response to drought and salt stress has been revealed. Salicylic acid, a phytohormone, has reported to be involved in a number of stress responses such as pathogen infection, UV irradiation, salinity and drought. Considering the concealed role of strigolactones in agronomic crops drought tolerance and possible interaction among salicylic acid and strigolactone, we investigated the effects of exogenous application of GR24 and salicylic acid on two winter wheat cultivars under drought conditions...
August 18, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28832544/genome-wide-identification-and-characterization-of-the-gmsnrk2-family-in-soybean
#9
Wei Zhao, Yi-Hui Cheng, Chi Zhang, Xin-Jie Shen, Qing-Bo You, Wei Guo, Xiang Li, Xue-Jiao Song, Xin-An Zhou, Yong-Qing Jiao
Sucrose non-fermenting-1 (SNF1)-related protein kinase 2s (SnRK2s) that were reported to be involved in the transduction of abscisic acid (ABA) signaling, play important roles in response to biotic and abiotic stresses in plants. Compared to the systemic investigation of SnRK2s in Arabidopsisthaliana and Oryza sativa, little is known regarding SnRK2s in soybean, which is one of the most important oil and protein crops. In the present study, we performed genome-wide identification and characterization of GmSnRK2s in soybean...
August 23, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28820177/simple-%C3%AE-lactones-are-potent-irreversible-antagonists-for-strigolactone-receptors
#10
Haibo Xiang, Ruifeng Yao, Tianfei Quan, Fei Wang, Li Chen, Xiaoxi Du, Wenhao Zhang, Haiteng Deng, Daoxin Xie, Tuoping Luo
No abstract text is available yet for this article.
August 18, 2017: Cell Research
https://www.readbyqxmd.com/read/28809396/ipa1-functions-as-a-downstream-transcription-factor-repressed-by-d53-in-strigolactone-signaling-in-rice
#11
Xiaoguang Song, Zefu Lu, Hong Yu, Gaoneng Shao, Jinsong Xiong, Xiangbing Meng, Yanhui Jing, Guifu Liu, Guosheng Xiong, Jingbo Duan, Xue-Feng Yao, Chun-Ming Liu, Hongqing Li, Yonghong Wang, Jiayang Li
Strigolactones (SLs), a group of carotenoid derived terpenoid lactones, are root-to-shoot phytohormones suppressing shoot branching by inhibiting the outgrowth of axillary buds. DWARF 53 (D53), the key repressor of the SL signaling pathway, is speculated to regulate the downstream transcriptional network of the SL response. However, no downstream transcription factor targeted by D53 has yet been reported. Here we report that Ideal Plant Architecture 1 (IPA1), a key regulator of the plant architecture in rice, functions as a direct downstream component of D53 in regulating tiller number and SL-induced gene expression...
September 2017: Cell Research
https://www.readbyqxmd.com/read/28789611/role-of-the-gras-transcription-factor-ata-ram1-in-the-transcriptional-reprogramming-of-arbuscular-mycorrhiza-in-petunia-hybrida
#12
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
#13
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
#14
Erin L McAdam, Cassandra Hugill, Sebastien Fort, Eric Samain, 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) mutant forms significantly fewer 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 Nod lipochitooligosaccharides (LCOs) and SL-deficient nodules appear to fix nitrogen at a similar rate to those of wild-type plants...
September 2017: Plant Physiology
https://www.readbyqxmd.com/read/28690842/chemical-genetics-and-strigolactone-perception
#15
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
#16
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
#17
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
#18
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
#19
Rondinelle G Pereira, Antonio Cala, Mónica Fernández-Aparicio, José Mg Molinillo, Maria Ad Boaventura, Francisco A Macías
BACKGROUND: Parasitic weeds are widespread and 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 the potential to apply a suicidal germination strategy for seed bank control of parasitic weeds. RESULTS: The D-ring, which is instrumental in the germination process of seeds of parasitic weeds, was attached to gibberellin (GA3 ) and kaurenoic acid 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
#20
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
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