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https://www.readbyqxmd.com/read/28636873/mimicking-natural-phytohormones-26-hydroxycholestan-22-one-derivatives-as-plant-growth-promoters
#1
Reyna Zeferino-Diaz, J Ciciolil Hilario-Martinez, Maricela Rodriguez-Acosta, Alan Carrasco-Carballo, Maria Guadalupe Hernandez-Linares, Jesus Sandoval-Ramirez, Maria A Fernandez-Herrera
26-Hydroxycholestan-22-one derivatives with oxygenated functions in the rings A and/or B were successfully synthesized from diosgenin. After the modifications of rings A and B, the spiroketal side chain was selectively opened through a Lewis acid mediated acetolysis to afford the cholestane derivatives. These compounds incorporate pharmacophores, which mimic the activity of natural phytohormones and show high growth promoting activity in Mexican rice cultivars using the rice lamina inclination test.
June 18, 2017: Steroids
https://www.readbyqxmd.com/read/28636152/dynamics-and-origin-of-cytokinins-involved-in-plant-manipulation-by-a-leaf-mining-insect
#2
Hui Zhang, Antoine Guiguet, Géraldine Dubreuil, Anna Kisiala, Peter Andreas, R J Neil Emery, Elisabeth Huguet, Mélanie Body, David Giron
Several herbivorous insects and plant-associated microorganisms control the phytohormonal balance, thus enabling them to successfully exploit the plant by inhibiting plant defences and withdrawing plant resources for their own benefit. The leaf-mining moth Phyllonorycter blancardella modifies the cytokinin (CK) profile of mined leaf-tissues, and the insect symbiotic bacteria Wolbachia is involved in the plant manipulation to the benefit of the insect host. To gain a deeper understanding into the possible origin and dynamics of CKs, we conducted an extensive characterization of CKs in larvae and in infected apple leaves...
June 21, 2017: Insect Science
https://www.readbyqxmd.com/read/28631319/herbivory-induced-jasmonates-constrain-plant-sugar-accumulation-and-growth-by-antagonizing-gibberellin-signaling-and-not-by-promoting-secondary-metabolite-production
#3
Ricardo A R Machado, Ian T Baldwin, Matthias Erb
Plants respond to herbivory by reconfiguring hormonal networks, increasing secondary metabolite production and decreasing growth. Furthermore, some plants display a decrease in leaf energy reserves in the form of soluble sugars and starch, leading to the hypothesis that herbivory-induced secondary metabolite production and growth reduction may be linked through a carbohydrate-based resource trade-off. In order to test the above hypothesis, we measured leaf carbohydrates and plant growth in seven genetically engineered Nicotiana attenuata genotypes that are deficient in one or several major herbivore-induced, jasmonate-dependent defensive secondary metabolites and proteins...
July 2017: New Phytologist
https://www.readbyqxmd.com/read/28629320/transcriptomic-changes-reveal-gene-networks-responding-to-the-overexpression-of-a-blueberry-dwarf-and-delayed-flowering-1-gene-in-transgenic-blueberry-plants
#4
Guo-Qing Song, Xuan Gao
BACKGROUND: Constitutive expression of the CBF/DREB1 for increasing freezing tolerance in woody plants is often associated with other phenotypic changes including dwarf plant and delayed flowering. These phenotypic changes have been observed when Arabidopsis DWARF AND DELAYED FLOWERING 1 (DDF1) was overexpressed in A. thaliana plants. To date, the DDF1 orthologues have not been studied in woody plants. The aim of this study is to investigate transcriptomic responses to the overexpression of blueberry (Vaccinium corymbosum) DDF1 (herein, VcDDF1-OX)...
June 19, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28624685/bacillus-subtilis-affects-mirnas-and-flavanoids-production-in-agrobacterium-tobacco-interaction
#5
Fahimeh Nazari, Naser Safaie, Bahram Mohammad Soltani, Masoud Shams-Bakhsh, Mohsen Sharifi
Agrobacterium tumefaciens is a very destructive plant pathogen. Selection of effective biological agents against this pathogen depends on more insight into molecular plant defence responses during the biocontrol agent-pathogen interaction. Auxin as a phytohormone is a key contributor in pathogenesis and plant defence and accumulation of auxin transport carriers are accompanied by increasing in flavonoid and miRNAs concentrations during plant interactions with bacteria. The aim of this research was molecular analysis of Bacillus subtilis (ATCC21332) biocontrol effect against A...
June 10, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28622601/immobilisation-of-barley-aleurone-layers-enables-parallelisation-of-assays-and-analysis-of-transient-gene-expression-in-single-cells
#6
Kinga Zór, Christina Mark, Arto Heiskanen, Claus Krogh Madsen, Martin Dufva, Jenny Emnéus, Henrik Brinch-Pedersen, Christine Finnie
The barley aleurone layer is an established model system for studying phytohormone signalling, enzyme secretion and programmed cell death during seed germination. Most analyses performed on the aleurone layer are end-point assays based on cell extracts, meaning each sample is only analysed at a single time point. By immobilising barley aleurone layer tissue on polydimethylsiloxane pillars in the lid of a multiwell plate, continuous monitoring of living tissue is enabled using multiple non-destructive assays in parallel...
June 8, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28617153/pectin-methylesterase-is-required-for-guard-cell-function-in-response-to-heat
#7
Hui-Chen Wu, Ya-Chen Huang, Lynne Stracovsky, Tsung-Luo Jinn
Pectin is an important cell wall polysaccharide required for cellular adhesion, extension, and plant growth. The pectic methylesterification status of guard cell walls influences the movement of stomata in response to different stimuli. Pectin methylesterase (PME) has a profound effect on cell wall modification, especially on the degree of pectic methylesterification during heat response. The Arabidopsis thaliana PME34 gene is highly expressed in guard cells and in response to the phytohormone abscisic acid...
June 15, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28616192/sex-specific-floral-morphology-biomass-and-phytohormones-associated-with-altitude-in-dioecious-populus-cathayana-populations
#8
Jundong He, Tingfa Dong, Kechao Huang, Yanxia Yang, Dadong Li, Xiao Xu, Xinhua He
Relationships between sex-specific floral traits and endogenous phytohormones associated with altitude are unknown particularly in dioecious trees. We thus examined the relationships between floral morphology or biomass and phytohormones in male and female flowers of dioecious Populus cathayana populations along an altitudinal gradient (1,500, 1,600, and 1,700 m above sea level) in the Xiaowutai Nature Reserve in northern China. The female and male flowers had the most stigma and pollen at 1,700 m, the largest ovaries and least pollen at 1,500 m, and the smallest ovaries and greater numbers of anthers at 1,600 m altitude...
June 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28614407/genome-wide-identification-and-characterization-of-micrornas-differentially-expressed-in-fibers-in-a-cotton-phytochrome-a1-rnai-line
#9
Qing Miao, Peng Deng, Sukumar Saha, Johnie N Jenkins, Chuan-Yu Hsu, Ibrokhim Y Abdurakhmonov, Zabardast T Buriev, Alan Pepper, Din-Pow Ma
Cotton fiber is an important commodity throughout the world. Fiber property determines fiber quality and commercial values. Previous studies showed that silencing phytochrome A1 gene (PHYA1) by RNA interference in Upland cotton (Gossypium hirsutum L. cv. Coker 312) had generated PHYA1 RNAi lines with simultaneous improvements in fiber quality (longer, stronger and finer fiber) and other key agronomic traits. Characterization of the altered molecular processes in these RNAi genotypes and its wild-type controls is a great interest to better understand the PHYA1 RNAi phenotypes...
2017: PloS One
https://www.readbyqxmd.com/read/28611799/endophytic-paecilomyces-formosus-lhl10-augments-glycine-max-l-adaptation-to-ni-contamination-through-affecting-endogenous-phytohormones-and-oxidative-stress
#10
Saqib Bilal, Abdul L Khan, Raheem Shahzad, Sajjad Asaf, Sang-Mo Kang, In-Jung Lee
This study investigated the Ni-removal efficiency of phytohormone-producing endophytic fungi Penicillium janthinellum, Paecilomyces formosus, Exophiala sp., and Preussia sp. Among four different endophytes, P. formosus LHL10 was able to tolerate up to 1 mM Ni in contaminated media as compared to copper and cadmium. P. formosus LHL10 was further assessed for its potential to enhance the phytoremediation of Glycine max (soybean) in response to dose-dependent increases in soil Ni (0.5, 1.0, and 5.0 mM). Inoculation with P...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28611467/phytohormonal-crosstalk-modulates-the-expression-of-mir166-165s-target-class-iii-hd-zips-and-kanadi-genes-during-root-growth-in-arabidopsis-thaliana
#11
Archita Singh, Shradha Roy, Sharmila Singh, Shabari Sarkar Das, Vibhav Gautam, Sandeep Yadav, Ashutosh Kumar, Alka Singh, Sukanya Samantha, Ananda K Sarkar
Both phytohormones and non-coding microRNAs (miRNAs) play important role in root development in Arabidopsis thaliana. Mature miR166/165 s, which are derived from precursor transcripts of concerned genes, regulate developmental processes, including leaf and root patterning, by targeting Class III HOMEODOMAIN LEUCINE-ZIPPER (HD-ZIP III) transcription factors (TFs). However, their regulation through hormones remained poorly understood. Here, we show that several phytohormones dynamically regulate the spatio-temporal expression pattern of miR166/165 and target HD-ZIP IIIs in developing roots...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28605980/indoleacetic-acid-production-and-plant-growth-promoting-potential-of-bacterial-endophytes-isolated-from-rice-oryza-sativa-l-seeds
#12
Raheem Shahzad, Muhammad Waqas, Abdul Latif Khan, Khadija Al-Hosni, Sang-Mo Kang, Chang-Woo Seo, In-Jung Lee
Bacterial endophytes from the phyllosphere and rhizosphere have been used to produce bioactive metabolites and to promote plant growth. However, little is known about the endophytes residing in seeds. This study aimed to isolate and identify seed-borne bacterial endophytes from rice and elucidate their potential for phytohormone production and growth enhancement. The isolated endophytes included Micrococcus yunnanensis RWL-2, Micrococcus luteus RWL-3, Enterobacter soli RWL-4, Leclercia adecarboxylata RWL-5, Pantoea dispersa RWL-6, and Staphylococcus epidermidis RWL-7, which were identified using 16S rRNA sequencing and phylogenetic analysis...
June 2017: Acta Biologica Hungarica
https://www.readbyqxmd.com/read/28604689/pyrazinamide-and-derivatives-block-ethylene-biosynthesis-by-inhibiting-acc-oxidase
#13
Xiangzhong Sun, Yaxin Li, Wenrong He, Chenggong Ji, Peixue Xia, Yichuan Wang, Shuo Du, Hongjiang Li, Natasha Raikhel, Junyu Xiao, Hongwei Guo
Ethylene is an important phytohormone that promotes the ripening of fruits and senescence of flowers thereby reducing their shelf lives. Specific ethylene biosynthesis inhibitors would help to decrease postharvest loss. Here, we identify pyrazinamide (PZA), a clinical drug used to treat tuberculosis, as an inhibitor of ethylene biosynthesis in Arabidopsis thaliana, using a chemical genetics approach. PZA is converted to pyrazinecarboxylic acid (POA) in plant cells, suppressing the activity of 1-aminocyclopropane-1-carboxylic acid oxidase (ACO), the enzyme catalysing the final step of ethylene formation...
June 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28587227/photoreceptor-phyb-involved-in-arabidopsis-temperature-perception-and-heat-tolerance-formation
#14
Junyi Song, Qijun Liu, Biru Hu, Wenjian Wu
The influence of temperature on plants is essential. However, our knowledge on the intricate regulation process underlying heat stress (HS) response in plants is limited. Recently, information about thermal sensors in vivo has begun to emerge. In this study, another primary environmental stimulus, light, was verified once again to work with temperature synergistically on plants, through the modulation of numerous biological processes. With the application of transcriptomic analysis, a substantial number of heat-responsive genes were detected involved in both light- and phytohormone-mediated pathways in Arabidopsis...
June 5, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28585465/chitosan-signaling-in-guard-cells-requires-endogenous-salicylic-acid
#15
Md Yeasin Prodhan, Mohammad Issak, Toshiyuki Nakamura, Shintaro Munemasa, Yoshimasa Nakamura, Yoshiyuki Murata
An elicitor chitosan (CHT) induces stomatal closure but the mechanism remains to be clarified. A phytohormone salicylic acid (SA) is crucial for elicitor-induced defense signaling in plants. Here we investigated whether endogenous SA is required for CHT signaling in guard cells. In the SA-deficient nahG mutant, treatment of CHT did not induce either apoplastic reactive oxygen species (ROS) production or stomatal closure but co-treatment of CHT and SA induced both apoplastic ROS production and stomatal closure, indicating the involvement of endogenous SA in CHT-induced apoplastic ROS production and CHT-induced stomatal closure...
June 6, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28584713/transcriptome-analysis-reveals-the-regulation-of-brassinosteroids-on-petal-growth-in-gerbera-hybrida
#16
Gan Huang, Meixiang Han, Wei Yao, Yaqin Wang
Gerbera hybrida is a cut-flower crop of global importance, and an understanding of the mechanisms underlying petal development is vital for the continued commercial development of this plant species. Brassinosteroids (BRs), a class of phytohormones, are known to play a major role in cell expansion, but their effect on petal growth in G. hybrida is largely unexplored. In this study, we found that the brassinolide (BL), the most active BR, promotes petal growth by lengthening cells in the middle and basal regions of petals, and that this effect on petal growth was greater than that of gibberellin (GA)...
2017: PeerJ
https://www.readbyqxmd.com/read/28584283/phytohormone-ethylene-responsive-arabidopsis-organ-growth-under-light-is-in-the-fine-regulation-of-photosystem-ii-deficiency-inducible-akin10-expression
#17
Geun-Don Kim, Young-Hee Cho, Sang-Dong Yoo
For photoautotrophic plants, light-dependent photosynthesis plays an important role in organismal growth and development. Under light, Arabidopsis hypocotyl growth is promoted by the phytohormone ethylene. Despite well-characterized ethylene signaling pathways, the functions of light in the hormone-inducible growth response still remain elusive. Our cell-based functional and plant-system-based genetic analyses with biophysical and chemical tools showed that a chemical blockade of photosystem (PS) II activity affects ethylene-induced hypocotyl response under light...
June 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28582619/phytohormones-behavior-in-the-model-environment-of-plant-and-human-lipid-membranes
#18
Michał Flasiński, Paulina Swiechowicz
Interactions between three auxins (IAA, BNOA and 2,4-D) and model 2D lipid systems mimicking plant and human cell membranes were investigated in monolayers formed at the air/water solution interface. The analysis was based on the recorded π - A isotherm characteristics complemented with Brewster angle microscopy. The influence of auxins on model membranes was discussed on the basis of condensation changes, modification of mutual lipid - lipid interactions in the mixed films as well as morphological alteration of the surface domains on the microscopic scale...
June 5, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28578021/transcriptome-profiling-of-the-floral-buds-and-discovery-of-genes-related-to-sex-differentiation-in-the-dioecious-cucurbit-coccinia-grandis-l-voigt
#19
Jatindra Nath Mohanty, Sanghamitra Nayak, Sumita Jha, Raj Kumar Joshi
Dioecious species offer an inclusive structure to study the molecular basis of sexual dimorphism in angiosperms. Despite having a small genome and heteromorphic sex chromosomes, Coccinia grandis is a highly neglected dioecious species with little information available on its physical state, genetic orientation and key sex-defining elements. In the present study, we performed RNA-Seq and DGE analysis of male (MB) and female (FB) buds in C. grandis to gain insights into the molecular basis of sex determination in this plant...
May 31, 2017: Gene
https://www.readbyqxmd.com/read/28577792/genome-wide-analysis-of-gene-expression-of-ems-induced-short-fiber-mutant-ligon-lintless-y-liy-in-cotton-gossypium-hirsutum-l
#20
Marina Naoumkina, Efrem Bechere, David D Fang, Gregory N Thyssen, Christopher B Florane
In this work we describe a chemically-induced short fiber mutant cotton line, Ligon-lintless-y (liy), which is controlled by a single recessive locus and affects multiple traits, including height of the plant, and length and maturity of fiber. An RNAseq analysis was used to evaluate global transcriptional changes during cotton fiber development at 3, 8 and 16days post anthesis. We found that 613, 2629 and 3397 genes were significantly down-regulated, while 2700, 477 and 3260 were significantly up-regulated in liy at 3, 8 and 16 DPA...
May 31, 2017: Genomics
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