A succinct access to ω-hydroxylated jasmonates via olefin metathesis

AbstractIn higher plants, jasmonates are lipid-derived signaling molecules that control many physiological processes, including responses to abiotic stress, defenses against insects and pathogens, and development. Among jasmonates, ω-oxidized compounds form an important subfamily. The biological roles of these ω-modified derivatives are not fully understood, largely due to their limited availability. Herein, a brief (two-step), simple and efficient (>80% yield), versatile, gram-scalable, and environmentally friendly synthetic route to ω-oxidized jasmonates is described. The approach utilizes olefin cross-metathesis as the key step employing inexpensive, commercially available substrates and catalysts.

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Localization of Adenosine Triphosphatase Activity in the Phleom of Nicotiana Tabacum

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100094401 ◽

1972 ◽

Vol 30 ◽

pp. 230-231

Author(s):

James Cronshaw ◽

Jamison E. Gilder

Keyword(s):

Plasma Membrane ◽

Atpase Activity ◽

Adenosine Triphosphatase ◽

Higher Plants ◽

High Surface ◽

Root Tip ◽

Animal Cells ◽

Physiological Processes ◽

Tip Cells ◽

Atpase Localization

Adenosine triphosphatase (ATPase) activity has been shown to be associated with numerous physiological processes in both plants and animal cells. Biochemical studies have shown that in higher plants ATPase activity is high in cell wall preparations and is associated with the plasma membrane, nuclei, mitochondria, chloroplasts and lysosomes. However, there have been only a few ATPase localization studies of higher plants at the electron microscope level. Poux (1967) demonstrated ATPase activity associated with most cellular organelles in the protoderm cells of Cucumis roots. Hall (1971) has demonstrated ATPase activity in root tip cells of Zea mays. There was high surface activity largely associated with the plasma membrane and plasmodesmata. ATPase activity was also demonstrated in mitochondria, dictyosomes, endoplasmic reticulum and plastids.

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A Scanning Electron Microscopic Study of Pro-Vascular Cellular Morphology in Chaetophora Incressata

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100119880 ◽

1985 ◽

Vol 43 ◽

pp. 638-639

Author(s):

A. E. Hotchkiss ◽

A. T. Hotchkiss ◽

R. P. Apkarian

Keyword(s):

Green Algae ◽

Vascular Plants ◽

Vascular System ◽

Higher Plants ◽

Wall Structure ◽

Electron Microscopic ◽

Physiological Processes ◽

Scanning Electron Microscopic Study ◽

Scanning Electron Microscopic ◽

Scanning Electron

Multicellular green algae may be an ancestral form of the vascular plants. These algae exhibit cell wall structure, chlorophyll pigmentation, and physiological processes similar to those of higher plants. The presence of a vascular system which provides water, minerals, and nutrients to remote tissues in higher plants was believed unnecessary for the algae. Among the green algae, the Chaetophorales are complex highly branched forms that might require some means of nutrient transport. The Chaetophorales do possess apical meristematic groups of cells that have growth orientations suggestive of stem and root positions. Branches of Chaetophora incressata were examined by the scanning electron microscope (SEM) for ultrastructural evidence of pro-vascular transport.

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Zn–Catalyzed Direct Synthesis of 3-Iodo-1,3-dienes from α-Allenols

Chemistry Proceedings ◽

10.3390/ecsoc-24-08091 ◽

2020 ◽

Vol 3 (1) ◽

pp. 113

Author(s):

Mireia Toledano-Pinedo ◽

Beatriz Peñín ◽

Teresa Martínez del Campo ◽

Pedro Almendros

Keyword(s):

Direct Synthesis ◽

Environmentally Friendly ◽

Synthetic Route

We wish to report herein a new protocol that allows one to obtain 3-iodo-1,3-dienes through a sustainable process starting from α-allenols. In this new synthetic route, zinc (II) derivatives are used as metallic promoter, which are an inexpensive and environmentally friendly species.

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Potassium: A Vital Regulator of Plant Responses and Tolerance to Abiotic Stresses

Agronomy ◽

10.3390/agronomy8030031 ◽

2018 ◽

Vol 8 (3) ◽

pp. 31 ◽

Cited By ~ 73

Author(s):

Mirza Hasanuzzaman ◽

M. Bhuyan ◽

Kamrun Nahar ◽

Md. Hossain ◽

Jubayer Mahmud ◽

...

Keyword(s):

Abiotic Stress ◽

Stress Tolerance ◽

Molecular Mechanisms ◽

Abiotic Stress Tolerance ◽

Ion Homeostasis ◽

Enzyme Activation ◽

Regulatory Function ◽

Plant Responses ◽

Plant Structure ◽

Physiological Processes

Among the plant nutrients, potassium (K) is one of the vital elements required for plant growth and physiology. Potassium is not only a constituent of the plant structure but it also has a regulatory function in several biochemical processes related to protein synthesis, carbohydrate metabolism, and enzyme activation. Several physiological processes depend on K, such as stomatal regulation and photosynthesis. In recent decades, K was found to provide abiotic stress tolerance. Under salt stress, K helps to maintain ion homeostasis and to regulate the osmotic balance. Under drought stress conditions, K regulates stomatal opening and helps plants adapt to water deficits. Many reports support the notion that K enhances antioxidant defense in plants and therefore protects them from oxidative stress under various environmental adversities. In addition, this element provides some cellular signaling alone or in association with other signaling molecules and phytohormones. Although considerable progress has been made in understanding K-induced abiotic stress tolerance in plants, the exact molecular mechanisms of these protections are still under investigation. In this review, we summarized the recent literature on the biological functions of K, its uptake, its translocation, and its role in plant abiotic stress tolerance.

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Environmentally friendly and facile synthesis of Rh nanoparticles at room temperature by alkaline ethanol solution and their application for ethanol electrooxidation

RSC Advances ◽

10.1039/c6ra26591j ◽

2017 ◽

Vol 7 (6) ◽

pp. 3161-3169 ◽

Cited By ~ 4

Author(s):

Fuhai Li ◽

Hanqin Weng ◽

Yun Shang ◽

Zuoming Ding ◽

Zheng Yang ◽

...

Keyword(s):

Room Temperature ◽

Environmentally Friendly ◽

Ethanol Solution ◽

Ethanol Electrooxidation ◽

Synthetic Route ◽

Facile Synthesis

A facile, fact and green synthetic route was developed to prepare Rh nanoparticles at room temperature.

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Identification of MdDof genes in apple and analysis of their response to biotic or abiotic stress

Functional Plant Biology ◽

10.1071/fp17288 ◽

2018 ◽

Vol 45 (5) ◽

pp. 528 ◽

Cited By ~ 1

Author(s):

Qing Yang ◽

Qiuju Chen ◽

Yuandi Zhu ◽

Tianzhong Li

Keyword(s):

Abiotic Stress ◽

Zinc Finger ◽

Flower Development ◽

Higher Plants ◽

Expression Patterns ◽

Fruit Trees ◽

Biological Processes ◽

Protein Motifs ◽

Gene Structures ◽

Dof Transcription Factors

As a classic plant-specific transcription factor family – the Dof domain proteins – are involved in a variety of biological processes in organisms ranging from unicellular Chlamydomonas to higher plants. However, there are limited reports of MdDof (Malus domestica Borkh. DNA-binding One Zinc Finger) domain proteins in fruit trees, especially in apple. In this study we identified 54 putative Dof transcription factors in the apple genome. We analysed the gene structures, protein motifs, and chromosome locations of each of the MdDof genes. Next, we characterised all 54 MdDofs their expression patterns under different abiotic and biotic stress conditions. It was found that MdDof6,26 not only played an important role in the biotic/abiotic stress but may also be involved in many molecular functions. Further, both in flower development and pollen tube growth it was found that the relative expression of MdDof24 increased rapidly, also with gene ontology analysis it was indicated that MdDof24 was involved in the chemical reaction and flower development pathways. Taken together, our results provide useful clues as to the function of MdDof genes in apple and serve as a reference for studies of Dof zinc finger genes in other plants.

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Functions of Jasmonic Acid in Plant Regulation and Response to Abiotic Stress

International Journal of Molecular Sciences ◽

10.3390/ijms21041446 ◽

2020 ◽

Vol 21 (4) ◽

pp. 1446 ◽

Cited By ~ 9

Author(s):

Jia Wang ◽

Li Song ◽

Xue Gong ◽

Jinfan Xu ◽

Minhui Li

Keyword(s):

Transcription Factors ◽

Abiotic Stress ◽

Jasmonic Acid ◽

Signaling Pathways ◽

Signaling Pathway ◽

Large Scale ◽

Higher Plants ◽

Complex Signal ◽

Ja Signaling ◽

Signal Network

Jasmonic acid (JA) is an endogenous growth-regulating substance, initially identified as a stress-related hormone in higher plants. Similarly, the exogenous application of JA also has a regulatory effect on plants. Abiotic stress often causes large-scale plant damage. In this review, we focus on the JA signaling pathways in response to abiotic stresses, including cold, drought, salinity, heavy metals, and light. On the other hand, JA does not play an independent regulatory role, but works in a complex signal network with other phytohormone signaling pathways. In this review, we will discuss transcription factors and genes involved in the regulation of the JA signaling pathway in response to abiotic stress. In this process, the JAZ-MYC module plays a central role in the JA signaling pathway through integration of regulatory transcription factors and related genes. Simultaneously, JA has synergistic and antagonistic effects with abscisic acid (ABA), ethylene (ET), salicylic acid (SA), and other plant hormones in the process of resisting environmental stress.

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α,ß-Didehydrosuberoylanilide hydroxamic acid (DDSAHA) as precursor and possible analogue of the anticancer drug SAHA

Beilstein Journal of Organic Chemistry ◽

10.3762/bjoc.15.245 ◽

2019 ◽

Vol 15 ◽

pp. 2524-2533 ◽

Cited By ~ 1

Author(s):

Shital K Chattopadhyay ◽

Subhankar Ghosh ◽

Sarita Sarkar ◽

Kakali Bhadra

Keyword(s):

Anticancer Drug ◽

Hela Cells ◽

Hydroxamic Acid ◽

Suberoylanilide Hydroxamic Acid ◽

Oxygen Species ◽

Synthetic Route ◽

Metathesis Reaction ◽

Cross Metathesis ◽

Terminal Alkene ◽

Derivatives Of

An alternate synthetic route to the important anticancer drug suberoylanilide hydroxamic acid (SAHA) from its α,ß-didehydro derivative is described. The didehydro derivative is obtained through a cross metathesis reaction between a suitable terminal alkene and N-benzyloxyacrylamide. Some of the didehydro derivatives of SAHA were preliminarily evaluated for anticancer activity towards HeLa cells. The administration of the analogues caused a significant decrease in the proliferation of HeLa cells. Furthermore, one of the analogues showed a maximum cytotoxicity with a minimum GI50 value of 2.5 µg/mL and the generation of reactive oxygen species (ROS) as some apoptotic features.

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