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https://www.readbyqxmd.com/read/27909790/strigolactones-affect-tomato-hormone-profile-and-somatic-embryogenesis
#1
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
https://www.readbyqxmd.com/read/27909441/apple-f-box-protein-mdmax2-regulates-plant-photomorphogenesis-and-stress-response
#2
Jian-Ping An, Rui Li, Feng-Jia Qu, Chun-Xiang You, Xiao-Fei Wang, Yu-Jin Hao
MAX2 (MORE AXILLARY GROWTH2) is involved in diverse physiological processes, including photomorphogenesis, the abiotic stress response, as well as karrikin and strigolactone signaling-mediated shoot branching. In this study, MdMAX2, an F-box protein that is a homolog of Arabidopsis MAX2, was identified and characterized. Overexpression of MdMAX2 in apple calli enhanced the accumulation of anthocyanin. Ectopic expression of MdMAX2 in Arabidopsis exhibited photomorphogenesis phenotypes, including increased anthocyanin content and decreased hypocotyl length...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27858514/involvement-of-sth7-in-light-adapted-development-in-arabidopsis-thaliana-promoted-by-both-strigolactone-and-karrikin
#3
Jutiporn Thussagunpanit, Yuko Nagai, Miyu Nagae, Kiyoshi Mashiguchi, Nobutaka Mitsuda, Masaru Ohme-Takagi, Takeshi Nakano, Hidemitsu Nakamura, Tadao Asami
Strigolactones (SLs) and karrikins (KARs) regulate photomorphogenesis. GR24, a synthetic SL and KAR1, a KAR, inhibit the hypocotyl elongation of Arabidopsis thaliana in a weak light. GR24 and KAR1 up-regulate the expression of STH7, encoding a transcription factor belonging to the double B-box zinc finger subfamily. In this study, we used STH7-overexpressing (STH7ox) lines and functionally defective STH7 (STH7-SRDX) mutants to investigate roles of SLs and KARs in photomorphogenesis of Arabidopsis. Hypocotyl elongation of STH7-SRDX mutants was less sensitive to both GR24 and KAR1 treatment than that of wild-type Arabidopsis under weak light conditions...
November 18, 2016: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/27847871/strigoquant-a-genetically-encoded-biosensor-for-quantifying-strigolactone-activity-and-specificity
#4
Sophia L Samodelov, Hannes M Beyer, Xiujie Guo, Maximilian Augustin, Kun-Peng Jia, Lina Baz, Oliver Ebenhöh, Peter Beyer, Wilfried Weber, Salim Al-Babili, Matias D Zurbriggen
Strigolactones are key regulators of plant development and interaction with symbiotic fungi; however, quantitative tools for strigolactone signaling analysis are lacking. We introduce a genetically encoded hormone biosensor used to analyze strigolactone-mediated processes, including the study of the components involved in the hormone perception/signaling complex and the structural specificity and sensitivity of natural and synthetic strigolactones in Arabidopsis, providing quantitative insights into the stereoselectivity of strigolactone perception...
November 2016: Science Advances
https://www.readbyqxmd.com/read/27811075/enzymatic-study-on-atccd4-and-atccd7-and-their-potential-to-form-acyclic-regulatory-metabolites
#5
Mark Bruno, Julian Koschmieder, Florian Wuest, Patrick Schaub, Mirjam Fehling-Kaschek, Jens Timmer, Peter Beyer, Salim Al-Babili
The Arabidopsis carotenoid cleavage dioxygenase 4 (AtCCD4) is a negative regulator of the carotenoid content of seeds and has recently been suggested as a candidate for the generation of retrograde signals that are thought to derive from the cleavage of poly-cis-configured carotene desaturation intermediates. In this work, we investigated the activity of AtCCD4 in vitro and used dynamic modeling to determine its substrate preference. Our results document strict regional specificity for cleavage at the C9-C10 double bond in carotenoids and apocarotenoids, with preference for carotenoid substrates and an obstructing effect on hydroxyl functions, and demonstrate the specificity for all-trans-configured carotenes and xanthophylls...
November 2016: Journal of Experimental Botany
https://www.readbyqxmd.com/read/27793831/strigolactone-regulates-shoot-development-through-a-core-signalling-pathway
#6
Tom Bennett, Yueyang Liang, Madeleine Seale, Sally Ward, Dörte Müller, Ottoline Leyser
Strigolactones are a recently identified class of hormone that regulate multiple aspects of plant development. The DWARF14 (D14) α/β fold protein has been identified as a strigolactone receptor, which can act through the SCF(MAX2) ubiquitin ligase, but the universality of this mechanism is not clear. Multiple proteins have been suggested as targets for strigolactone signalling, including both direct proteolytic targets of SCF(MAX2), and downstream targets. However, the relevance and importance of these proteins to strigolactone signalling in many cases has not been fully established...
November 8, 2016: Biology Open
https://www.readbyqxmd.com/read/27766430/transcriptional-profiling-of-arbuscular-mycorrhizal-roots-exposed-to-high-levels-of-phosphate-reveals-the-repression-of-cell-cycle-related-genes-and-secreted-protein-genes-in-rhizophagus-irregularis
#7
Yusaku Sugimura, Katsuharu Saito
The development of arbuscular mycorrhiza (AM) is strongly suppressed under high-phosphate (Pi) conditions. To investigate AM fungal responses during the suppression of AM by high Pi, we performed an RNA-seq analysis of Rhizophagus irregularis colonizing Lotus japonicus roots at different levels of Pi (20, 100, 300, and 500 μM). AM fungal colonization decreased markedly under high-Pi conditions. In total, 163 fungal genes were differentially expressed among the four Pi treatments. Among these genes, a cell cycle-regulatory gene, cyclin-dependent kinase CDK1, and several DNA replication- and mitosis-related genes were repressed under high-Pi conditions...
October 20, 2016: Mycorrhiza
https://www.readbyqxmd.com/read/27760882/low-phosphate-induction-of-plastidal-stromules-is-dependent-on-strigolactones-but-not-on-the-canonical-strigolactone-signaling-component-max2
#8
Gilles Vismans, Tom van der Meer, Olivier Langevoort, Marielle Schreuder, Harro Bouwmeester, Helga Peisker, Peter Dörman, Tijs Ketelaar, Alexander van der Krol
Stromules are highly dynamic protrusions of the plastids in plants. Several factors, such as drought and light conditions, influence the stromule frequency (SF) in a positive or negative way. A relatively recently discovered class of plant hormones are the strigolactones; strigolactones inhibit branching of the shoots and promote beneficial interactions between roots and arbuscular mycorrhizal fungi. Here, we investigate the link between the formation of stromules and strigolactones. This research shows a strong link between strigolactones and the formation of stromules: SF correlates with strigolactone levels in the wild type and strigolactone mutants (max2-1 max3-9), and SF is stimulated by strigolactone GR24 and reduced by strigolactone inhibitor D2...
December 2016: Plant Physiology
https://www.readbyqxmd.com/read/27748948/sl-iaa27-regulates-strigolactone-biosynthesis-and-mycorrhization-in-tomato-var-microtom
#9
Bruno Guillotin, Mohammad Etemadi, Corinne Audran, Mondher Bouzayen, Guillaume Bécard, Jean-Philippe Combier
Root colonization by arbuscular mycorrhizal (AM) fungi is a complex and finely tuned process. Previous studies have shown that, among other plant hormones, auxin plays a role in this process but the specific involvement of Aux/IAAs, the key regulators of auxin responses, is still unknown. In this study, we addressed the role of the tomato Sl-IAA27 during AM symbiosis by using Sl-IAA27-RNAi and pSL-IAA27::GUS stable tomato lines. The data show that Sl-IAA27 expression is up-regulated by the AM fungus and that silencing of Sl-IAA27 has a negative impact on AM colonization...
October 17, 2016: New Phytologist
https://www.readbyqxmd.com/read/27716937/low-levels-of-strigolactones-in-roots-as-a-component-of-the-systemic-signal-of-drought-stress-in-tomato
#10
Ivan Visentin, Marco Vitali, Manuela Ferrero, Yanxia Zhang, Carolien Ruyter-Spira, Ondřej Novák, Miroslav Strnad, Claudio Lovisolo, Andrea Schubert, Francesca Cardinale
Strigolactones (SL) contribute to drought acclimatization in shoots, because SL-depleted plants are hypersensitive to drought due to stomatal hyposensitivity to abscisic acid (ABA). However, under drought, SL biosynthesis is repressed in roots, suggesting organ specificity in their metabolism and role. Because SL can be transported acropetally, such a drop may also affect shoots, as a systemic indication of stress. We investigated this hypothesis by analysing molecularly and physiologically wild-type (WT) tomato (Solanum lycopersicum) scions grafted onto SL-depleted rootstocks, compared with self-grafted WT and SL-depleted genotypes, during a drought time-course...
December 2016: New Phytologist
https://www.readbyqxmd.com/read/27700003/strigolactones-and-parasitic-weed-management-50-years-after-the-discovery-of-the-first-natural-strigolactone-strigol-status-and-outlook
#11
Claudio Screpanti, Koichi Yoneyama, Harro J Bouwmeester
No abstract text is available yet for this article.
November 2016: Pest Management Science
https://www.readbyqxmd.com/read/27670819/phloem-transport-of-the-receptor-dwarf14-protein-is-required-for-full-function-of-strigolactones
#12
Hiromu Kameoka, Elizabeth A Dun, Mauricio Lopez-Obando, Philip B Brewer, Alexandre de Saint Germain, Catherine Rameau, Christine A Beveridge, Junko Kyozuka
The cell-to-cell transport of signaling molecules is essential for multicellular organisms to coordinate the action of their cells. Recent studies identified DWARF14 (D14) as a receptor of strigolactones (SLs), molecules that act as plant hormones and inhibit shoot branching. Here, we demonstrate that RAMOSUS3, a pea ortholog of D14, works as a graft-transmissible signal to suppress shoot branching. In addition, we show that D14 protein is contained in phloem sap and transported through the phloem to axillary buds in rice...
November 2016: Plant Physiology
https://www.readbyqxmd.com/read/27662376/unveiling-the-functional-diversity-of-the-alpha-beta-hydrolase-superfamily-in-the-plant-kingdom
#13
Jeffrey T Mindrebo, Charisse M Nartey, Yoshiya Seto, Michael D Burkart, Joseph P Noel
The alpha/beta hydrolase (ABH) superfamily is a widespread and functionally malleable protein fold recognized for its diverse biochemical activities across all three domains of life. ABH enzymes possess unexpected catalytic activity in the green plant lineage through selective alterations in active site architecture and chemistry. Furthermore, the ABH fold serves as the core structure for phytohormone and ligand receptors in the gibberellin, strigolactone, and karrikin signaling pathways in plants. Despite recent discoveries, the ABH family is sparsely characterized in plants, a sessile kingdom known to evolve complex and specialized chemical adaptations as survival responses to widely varying biotic and abiotic ecologies...
September 20, 2016: Current Opinion in Structural Biology
https://www.readbyqxmd.com/read/27658783/strigolactones-redefine-plant-hormones
#14
Lu Wang, Steven M Smith
No abstract text is available yet for this article.
October 2016: Science China. Life Sciences
https://www.readbyqxmd.com/read/27615727/strigolactones-as-part-of-the-plant-defence-system
#15
Marek Marzec
Strigolactones (SLs) are plant hormones, described as regulators of plant growth and development. Recently, it was proposed that these hormones might also be involved in the biotic stress response. However, SLs do not have a universal role in plant protection, instead only playing a part in resistance to specific pathogens.
September 5, 2016: Trends in Plant Science
https://www.readbyqxmd.com/read/27611187/evaluation-of-field-resistance-to-striga-hermonthica-del-benth-in-sorghum-bicolor-l-moench-the-relationship-with-strigolactones
#16
Nasreldin Mohemed, Tatsiana Charnikhova, Evert J Bakker, Aad van Ast, Abdelgabar Gt Babiker, Harro J Bouwmeester
BACKGROUND: Significant losses in sorghum biomass and grain yield occur in sub-Saharan Africa owing to infection by the root-parasitic weed Striga hermonthica (Del.) Benth. One strategy to avoid these losses is to adopt resistant crop varieties. For further delineation of the role of germination stimulants in resistance, we conducted a field experiment employing six sorghum genotypes, in eastern Sudan, and in parallel analysed the strigolactone levels in the root exudates of these genotypes under controlled conditions in Wageningen...
November 2016: Pest Management Science
https://www.readbyqxmd.com/read/27602041/perception-and-signaling-of-strigolactones
#17
REVIEW
Marek Marzec
Strigolactones (SLs), a recently discovered class of phytohormones, are important regulators of plant growth and development. While the biosynthetic pathway of these molecules is well documented, until recently there was not much known about the molecular mechanisms underlying SL perception and signal transduction in plants. Certain aspects of their perception and signaling, including the hormone-mediated interaction between receptor and F-box protein, degradation of suppressor proteins and activation of transcription factors, are also found in other phytohormones...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27558842/characterization-of-low-strigolactone-germplasm-in-pea-pisum-sativum-l-resistant-to-crenate-broomrape-orobanche-crenata-forsk
#18
Stefano Pavan, Adalgisa Schiavulli, Angelo Raffaele Marcotrigiano, Nicoletta Bardaro, Valentina Bracuto, Francesca Ricciardi, Tatsiana Charnikhova, Concetta Lotti, Harro Bouwmeester, Luigi Ricciardi
Crenate broomrape (Orobanche crenata Forsk.) is a devastating parasitic weed threatening the cultivation of legumes around the Mediterranean and in the Middle East. So far, only moderate levels of resistance were reported to occur in pea (Pisum sativum L.) natural germplasm, and most commercial cultivars are prone to severe infestation. Here, we describe the selection of a pea line highly resistant to O. crenata, following the screening of local genetic resources. Time series observations show that delayed emergence of the parasite is an important parameter associated with broomrape resistance...
October 4, 2016: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/27557329/change-in-auxin-and-cytokinin-levels-coincides-with-altered-expression-of-branching-genes-during-axillary-bud-outgrowth-in-chrysanthemum
#19
Robrecht Dierck, Ellen De Keyser, Jan De Riek, Emmy Dhooghe, Johan Van Huylenbroeck, Els Prinsen, Dominique Van Der Straeten
In the production and breeding of Chrysanthemum sp., shoot branching is an important quality aspect as the outgrowth of axillary buds determines the final plant shape. Bud outgrowth is mainly controlled by apical dominance and the crosstalk between the plant hormones auxin, cytokinin and strigolactone. In this work the hormonal and genetic regulation of axillary bud outgrowth was studied in two differently branching cut flower Chrysanthemum morifolium (Ramat) genotypes. C17 is a split-type which forms an inflorescence meristem after a certain vegetative period, while C18 remains vegetative under long day conditions...
2016: PloS One
https://www.readbyqxmd.com/read/27523280/the-arabidopsis-b-box-protein-bzs1-bbx20-interacts-with-hy5-and-mediates-strigolactone-regulation-of-photomorphogenesis
#20
Chuang-Qi Wei, Chih-Wei Chien, Lian-Feng Ai, Jun Zhao, Zhenzhen Zhang, Kathy H Li, Alma L Burlingame, Yu Sun, Zhi-Yong Wang
Plant growth is controlled by integration of hormonal and light-signaling pathways. BZS1 is a B-box zinc finger protein previously characterized as a negative regulator in the brassinosteroid (BR)-signaling pathway and a positive regulator in the light-signaling pathway. However, the mechanisms by which BZS1/BBX20 integrates light and hormonal pathways are not fully understood. Here, using a quantitative proteomic workflow, we identified several BZS1-associated proteins, including light-signaling components COP1 and HY5...
September 20, 2016: Journal of Genetics and Genomics, Yi Chuan Xue Bao
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