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Sarcaglarols A-D, Lindenane-Monoterpene Heterodimers from Sarcandra glabra Based on molecular networks

Chinese Journal of Chemistry 2021年第1期39卷 129-136页

作者： Yongyue Wang Zhirong Cui Jun Chi Pengfei Tang Meihui Zhang Jixin Li Yongyi Li Hao Zhang Jun Luo Lingyi Kong Jingsu Key laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines School of Taditional Chinese PharmacyChina Pharmaceutical UniversityNanjingJiangsu 210009China

Sarcaglarols A-D(1-4),two pairs of lindenane-monoterpene heterodimers fused by a 1,2-dioxane moiety,were discovered and isolated from the leaves of Sarcandra glabra guided by MS/MS molecular networking-based strategy.Their planar structures,absolute configurations of basic skeleton and flexible polyhydric side chain were established by analysis of HRESIMS,NMR spectroscopic data,ECD spectrum,and the X-ray diffraction study of isopropylidene derivatives.An intermolecular[2+2+2]cycloaddition may play a key role in the biosynthesis pathway of the 1,2-dioxane moiety fused lindenane-monoterpene heterodimer skeleton,which can be recognized as the biogenetic precursors of our previous reported lindenane-normonoterpene conjugates.In addition,compounds 1,3 and 4 exhibited moderate inhibitory effects of lipid accumulation in free fatty acid-exposed L02 cells.

关键词： Sarcandra glabra molecular networks Natural products Structural elucidation Peroxides

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molecular bases of rice grain size and quality for optimized productivity

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Science Bulletin 2023年第3期68卷 314-350,M0004页

作者： Deyong Ren Chaoqing Ding Qian Qian State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006China

The accomplishment of further optimization of crop productivity in grain yield and quality is a great challenge.Grain size is one of the crucial determinants of rice yield and quality;all of these traits are typical quantitative traits controlled by multiple genes.Research advances have revealed several molecular and developmental pathways that govern these traits of agronomical importance.This review provides a comprehensive summary of these pathways,including those mediated by G-protein,the ubiquitin–proteasome system,mitogen-activated protein kinase,phytohormone,transcriptional regulators,and storage product biosynthesis and accumulation.We also generalize the excellent precedents for rice variety improvement of grain size and quality,which utilize newly developed gene editing and conventional gene pyramiding capabilities.In addition,we discuss the rational and accurate breeding strategies,with the aim of better applying molecular design to breed high-yield and superior-quality varieties.

关键词： Rice Grain size Grain quality Genetic control molecular networks Variety improvement

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Chlospicenes A and B,cyclopropane cracked lindenane sesquiterpenoid dimers with anti-nonalcoholic steatohepatitis activity from Chloranthus henryi

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Chinese Chemical Letters 2022年第9期33卷 4257-4260页

作者： Jixin Li Zhirong Cui Yongyi Li Chunhua Han Yanqiu Zhang Pengfei Tang Letian Cui Hao Zhang Jun Luo Lingyi Kong Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines School of Traditional Chinese PharmacyChina Pharmaceutical UniversityNanjing 210009China School of Pharmacy Guizhou University of Traditional Chinese MedicineGuiyang 550025China

Guided by MS/MS molecular networks strategy,chlospicenes A and B(1 and 2),the first example of cyclopropane moiety cracked lindenane sesquiterpene Michael addition dimers,along with their biogenetic analogues(3 and 4),were targetedly discovered from the roots of Chloranthus henryi.Their structures including absolute configurations were characterized by NMR,ECD and X-ray diffraction analysis.The plausible biogenic pathway speculation indicated that cyclopropylcarbinyl rearrangement may dominate the key crack of cyclopropane moiety.In addition,compounds 1 and 2 showed significant anti-nonalcoholic steatohepatitis(NASH)activity in free fatty acid(FFA)-induced HepG2 cells by decreasing intracellular lipid accumulation.

关键词： Chloranthus henryi. Lindenane sesquiterpenoid dimer molecular networks Cyclopropylcarbinyl rearrangement Anti-nonalcoholic steatohepatitis

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The stomata frontline of plant interaction with the environment-perspectives from hormone regulation

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Frontiers in Biology 2012年第2期7卷 96-112页

作者： Mengmeng ZHU Shaojun DAI Sixue CHEN Department of Biology Genetics Institute Interdisciplinary Center for Biotechnology Research （ICBR） University of Florida Gainesville FL 32610 USA Alkali Soil Natural Environmental Science Center Northeast Forestry University Key Laboratory of Saline-alkali Vegetation Ecology Restoration in Oil Field Ministry of Education Harbin 150040 China

Plants have evolved elaborate mechanisms to perceive and integrate signals from various environmental conditions. On leaf surface, stomata formed by pairs of guard cells mediate gas exchange, water transpiration as well as function in response to abiotic and biotic stresses. Stomatal closure could be induced by drought, salt, pathogen and other adverse conditions. This constitutes an instant defense response to prevent further damage to plants. Abscisic acid （ABA） is a major plant hormone involved in stress responses. Stress-activated ABA synthesis causes stomatal closure and prevents opening to reduce water loss and cell dehydration. Key regulatory receptor complex and other important components in the ABA signaling pathway have been identified. However, our knowledge of ABA signal transduction in guard cells is far from complete. Jasmonates are a group of phytohormones generally known to be important for plant defense against insects and necrotrophic pathogens. The increased levels of methyl jasmonate （MeJA） induced by herbivory and pathogen invasion show a similar effect on stomatal movement associated with ROS production as ABA. Investigation of guard cell signaling networks involving the two important phytohormones is significant and exciting. Information about protein and metabolite components and how they interact in guard cells is lacking. Here we review recent advances on hormone signaling networks in guard cells and how the networks integrate environmental signals to plant physiological output.

关键词： stomata guard cells hormone signaling molecular networks

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Revisiting the Ripening Control Model

Revisiting the Ripening Control Model

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第三届全国植物开花·衰老与采后生物学大会

作者： Don Grierson Zhejiang University China School of Biosciences University of Nottingham

A skeletal model outlining the regulation of fruit ripening based mainly on tomato research has guided ripening studies for several decades. I will discuss old observations and new discoveries that raise questions and challenge our understanding of the initiation, progression and regulation of ripening. This can highlight areas where new investigations are likely to improve our understanding of the molecular networks controlling ripening and generation of quality attributes during ripening of all fruits.

关键词： ripening tomato molecular networks

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