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https://www.readbyqxmd.com/read/29156607/calcium-dependent-protein-kinases-in-phytohormone-signaling-pathways
#1
REVIEW
Wuwu Xu, Wenchao Huang
Calcium-dependent protein kinases (CPKs/CDPKs) are Ca(2+)-sensors that decode Ca(2+) signals into specific physiological responses. Research has reported that CDPKs constitute a large multigene family in various plant species, and play diverse roles in plant growth, development, and stress responses. Although numerous CDPKs have been exhaustively studied, and many of them have been found to be involved in plant hormone biosynthesis and response mechanisms, a comprehensive overview of the manner in which CDPKs participate in phytohormone signaling pathways, regulating nearly all aspects of plant growth, has not yet been undertaken...
November 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29131815/the-karrikin-receptor-kai2-promotes-drought-resistance-in-arabidopsis-thaliana
#2
Weiqiang Li, Kien Huu Nguyen, Ha Duc Chu, Chien Van Ha, Yasuko Watanabe, Yuriko Osakabe, Marco Antonio Leyva-González, Mayuko Sato, Kiminori Toyooka, Laura Voges, Maho Tanaka, Mohammad Golam Mostofa, Motoaki Seki, Mitsunori Seo, Shinjiro Yamaguchi, David C Nelson, Chunjie Tian, Luis Herrera-Estrella, Lam-Son Phan Tran
Drought causes substantial reductions in crop yields worldwide. Therefore, we set out to identify new chemical and genetic factors that regulate drought resistance in Arabidopsis thaliana. Karrikins (KARs) are a class of butenolide compounds found in smoke that promote seed germination, and have been reported to improve seedling vigor under stressful growth conditions. Here, we discovered that mutations in KARRIKIN INSENSITIVE2 (KAI2), encoding the proposed karrikin receptor, result in hypersensitivity to water deprivation...
November 13, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/29116554/recent-advances-in-molecular-basis-for-strigolactone-action
#3
REVIEW
Ruifeng Yao, Jiayang Li, Daoxin Xie
Strigolactones (SLs) are a very special class of plant hormones, which act as endogenous signals to regulate shoot branching in plants, and also serve as rhizosphere signals to regulate interactions of host plants with heterologous organisms such as symbiotic arbuscular mycorrhizal fungi and parasitic weeds. In this short review, we give a brief description of novel discoveries in SL biosynthesis pathway, and mainly summarize the recent advances in SL perception and signal transduction.
November 6, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/29110072/the-genetic-and-molecular-basis-of-crop-height-based-on-a-rice-model
#4
REVIEW
Fang Liu, Pandi Wang, Xiaobo Zhang, Xiaofei Li, Xiaohong Yan, Donghui Fu, Gang Wu
This review presents genetic and molecular basis of crop height using a rice crop model. Height is controlled by multiple genes with potential to be manipulated through breeding strategies to improve productivity. Height is an important factor affecting crop architecture, apical dominance, biomass, resistance to lodging, tolerance to crowding and mechanical harvesting. The impressive increase in wheat and rice yield during the 'green revolution' benefited from a combination of breeding for high-yielding dwarf varieties together with advances in agricultural mechanization, irrigation and agrochemical/fertilizer use...
November 6, 2017: Planta
https://www.readbyqxmd.com/read/29099877/transcriptome-analysis-of-phelipanche-aegyptiaca-seed-germination-mechanisms-stimulated-by-fluridone-tis108-and-gr24
#5
Ya Zhou Bao, Zhao Qun Yao, Xiao Lei Cao, Jin Feng Peng, Ying Xu, Mei Xiu Chen, Si Feng Zhao
P. aegyptiaca is one of the most destructive root parasitic plants worldwide, causing serious damage to many crop species. Under natural conditions P. aegyptiaca seeds must be conditioned and then stimulated by host root exudates before germinating. However, preliminary experiments indicated that TIS108 (a triazole-type inhibitor of strigolactone) and fluridone (FL, an inhibitor of carotenoid-biosynthesis) both stimulated the germination of P. aegyptiaca seeds without a water preconditioning step (i.e. unconditioned seeds)...
2017: PloS One
https://www.readbyqxmd.com/read/29095562/stability-of-strigolactone-analog-gr24-toward-nucleophiles
#6
Rostislav Halouzka, Petr Tarkowski, Binne Zwanenburg, Sanja Ćavar Zeljković
BACKGROUND: Strigolactones (SLs) are plant hormones that play various roles in plant development. The chemical stability of SLs depends on the solvent, pH, and the presence of nucleophiles. Hydrolysis leads to detachment of the butenolide ring, and plays a crucial role in the initial stages of the signal-transduction process occurring between the receptor and the SL signaling molecule. RESULTS: To date, two different mechanisms have been proposed for SL hydrolysis...
November 2, 2017: Pest Management Science
https://www.readbyqxmd.com/read/29083039/changes-in-the-allocation-of-endogenous-strigolactone-improve-plant-biomass-production-on-phosphate-poor-soils
#7
Guowei Liu, Johannes Pfeifer, Rita de Brito Francisco, Aurelia Emonet, Marina Stirnemann, Christian Gübeli, Olivier Hutter, Joëlle Sasse, Christian Mattheyer, Ernst Stelzer, Achim Walter, Enrico Martinoia, Lorenzo Borghi
Strigolactones (SLs) are carotenoid-derived phytohormones shaping plant architecture and inducing the symbiosis with endomycorrhizal fungi. In Petunia hybrida, SL transport within the plant and towards the rhizosphere is driven by the ABCG-class protein PDR1. PDR1 expression is regulated by phytohormones and by the soil phosphate abundance, and thus SL transport integrates plant development with nutrient conditions. We overexpressed PDR1 (PDR1 OE) to investigate whether increased endogenous SL transport is sufficient to improve plant nutrition and productivity...
October 30, 2017: New Phytologist
https://www.readbyqxmd.com/read/29021800/strigolactones-improve-plant-growth-photosynthesis-and-alleviate-oxidative-stress-under-salinity-in-rapeseed-brassica-napus-l-by-regulating-gene-expression
#8
Ni Ma, Chao Hu, Lin Wan, Qiong Hu, Junlan Xiong, Chunlei Zhang
Rapeseed (Brassica napus L.) is a very important edible oil crop in the world, and the production is inhibited by abiotic stresses, such as salinity. Plant hormones can alleviate the stress by regulating the physiological processes and gene expression. To study the plant responses to salinity in combination with GR24, a synthesized strigolactone, the oilseed rape variety (Zhongshuang 11) replications were grown in the pots in a controlled growth chamber under three levels of salinity (0, 100, and 200 mM NaCl) and 0...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28977719/largely-additive-effects-of-gibberellin-and-strigolactone-on-gene-expression-in-arabidopsis-thaliana-seedlings
#9
Ourania Lantzouni, Carina Klermund, Claus Schwechheimer
The phytohormones gibberellin (GA) and strigolactone (SL) are involved in essential processes in plant development. Both GA and SL signal transduction mechanisms employ α/β-hydrolase-derived receptors that confer E3 ubiquitin ligase-mediated protein degradation processes. This suggests a common evolutionary origin of these pathways and possibly a molecular interaction between them. One such indication stems from rice, where the DELLA protein of the GA pathway was reported to interact with the SL receptor...
October 4, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28970845/comprehensive-analysis-of-dwarf14-like2-dlk2-reveals-its-functional-divergence-from-strigolactone-related-paralogs
#10
Attila Végh, Norbert Incze, Attila Fábián, Heqiang Huo, Kent J Bradford, Ervin Balázs, Vilmos Soós
Strigolactones (SLs) and related butenolides, originally identified as active seed germination stimulants of parasitic weeds, play important roles in many aspects of plant development. Two members of the D14 α/β hydrolase protein family, DWARF14 (D14) and KARRIKIN INSENSITIVE2 (KAI2) are essential for SL/butenolide signaling. The third member of the family in Arabidopsis, DWARF 14-LIKE2 (DLK2) is structurally very similar to D14 and KAI2, but its function is unknown. We demonstrated that DLK2 does not bind nor hydrolyze natural (+)5-deoxystrigol [(+)5DS], and weakly hydrolyzes non-natural strigolactone (-)5DS...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28940201/strigolactone-triggered-stomatal-closure-requires-hydrogen-peroxide-synthesis-and-nitric-oxide-production-in-an-abscisic-acid-independent-manner
#11
Shuo Lv, Yonghong Zhang, Chen Li, Zhijun Liu, Nan Yang, Lixia Pan, Jinbin Wu, Jiajing Wang, Jingwei Yang, Yanting Lv, Yutao Zhang, Wenqian Jiang, Xiaoping She, Guodong Wang
Accumulating data indicate that strigolactones (SLs) are implicated in the response to environmental stress, implying a potential effect of SLs on stomatal response and thus stress acclimatization. In this study, we investigated the molecular mechanism underlying the effect of SLs on stomatal response and their interrelation with abscisic acid (ABA) signaling. The impact of SLs on the stomatal response was investigated by conducting SL-feeding experiments and by analyzing SL-related mutants. The involvement of endogenous ABA and ABA-signaling components in SL-mediated stomatal closure was physiologically evaluated using genetic mutants...
September 22, 2017: New Phytologist
https://www.readbyqxmd.com/read/28939863/total-synthesis-of-avenaol
#12
Motohiro Yasui, Rina Ota, Chihiro Tsukano, Yoshiji Takemoto
Avenaol, isolated from the allelopathic plant black oat, was the first C20 germination stimulant related to strigolactones. Structurally, it consisted of a bicyclo[4.1.0]heptanone skeleton containing a cyclopropane ring bearing three main chains projecting in the same direction (i.e. all-cis-substituted cyclopropane). Herein, we report the total synthesis of avenaol using a robust strategy involving the formation of an all-cis-substituted cyclopropane via an alkylidenecyclopropane. The key factors in the success of this total synthesis include the Rh-catalysed intramolecular cyclopropanation of an allene, an Ir-catalysed stereoselective double-bond isomerisation, and the differentiation of two hydroxymethyl groups via the regioselective formation and oxidation of a tetrahydropyran based on the reactivity of a cyclopropyl group...
September 22, 2017: Nature Communications
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
#13
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.
October 4, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28922755/root-transcriptomic-responses-of-grafted-grapevines-to-heterogeneous-nitrogen-availability-depend-on-rootstock-genotype
#14
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
#15
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
#16
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
#17
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.
October 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
#18
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...
October 4, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28844847/strigolactones-and-gibberellins-a-new-couple-in-the-phytohormone-world
#19
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.
October 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
#20
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
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