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The Basal Level ethylene.Response is Important to the Wall and Endomembrane Structure in the Hypocotyl Cells of Etiolated Arabidopsis Seedlings

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Journal of Integrative Plant Biology 2012年第7期54卷 434-455页

作者： Chan Xu Xiaoyan Gao Xiaobin Sun Chi-Kuang Wen National KeyLaboratory of Plant Molecular Genetics and National Center for Plant Gene Research(Shanghai) Institute of Plant Physiology and EcologyShanghai Institutes for Biological SciencesChinese Academy of Sciences300 Fenglin RdShanghai 200032China Shanghai Applied Protein Technology ShanghaiChina

The sub-cellular events that occur during the ethylene.modulated cell elongation were characterized by examining the ultra-structure of etiolated Arabidopsis seedling hypocotyl cells. Preventing the basal level ethylene.response facilitated cell elongation, and the cells exhibited wall loosening and separation phenotype. Nearby the wall separation sites were frequently associated with an increase in the cortical rough endoplasmic reticulum （rER） membranes, the presence of paramural bodies, and the circular Golgi formation. The cortical rER proliferation and circular Golgi phenotype were reverted by the protein biosynthesis inhibitor cycloheximide. The cortical rER membranes were longer when the ethylene.response was prevented and shortened with elevated ethylene.responses. Proteomic changes between wild type and the ethylene.insensitive mutant ethylene.insensitive2 （ein2） seedling hypocotyls indicated that distinct subsets of proteins involving endomembrane trafficking, remodeling, and wall modifications were differentially expressed. FM4-64 staining supported the proteomic changes, which indicated reduced endocytosis activity with alleviation of the ethylene.response. The basal level ethylene.response has an important role in endomembrane trafficking, biological materials transport and maintenance of the endomembrane organization. It is possible that endomembrane alterations may partly associate with the wall modifications, though the biological significance of the alterations should be addressed in future studies.

关键词： ER proliferation cell walls circular Golgi endomembrane trafficking ethylene.

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CATALYTIC COPOLYMERIZATION OF STYRENE AND ethylene.BY NEUTRAL NICKEL(Ⅱ) COMPLEXES IN EMULSION

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Chinese Journal of Polymer Science 2009年第5期27卷 667-674页

作者：袁荞龙 School of Materials Science & Engineering East China University of Science and Technology

Emulsion copolymerization of styrene and ethylene.catalyzed by a series of neutral nickel(Ⅱ) complexes was carried out in an aqueous system to give high-molecular-weight copolymers.The copolymers and emulsions were characterized by an array of techniques including NMR,GPC,TEM,WAXD and DSC.The results indicate that the copolymers obtained are mostly block copolymers of polyethylene.with random insertion of styrene units,and their M_W is in the range of 10~5-10~6.By enhancing the electron withdrawing of the s...

关键词： Salicylaldiminato nickel complexes Catalytic copolymerization Emulsion Styrene ethylene.

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Age-Triggered and Dark-Induced Leaf Senescence Require the bHLH Transcription Factors PIF3, 4, and 5

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Molecular Plant 2014年第12期7卷 1776-1787页

作者： Yi Song Chuangwei Yang Shan Gao Wei Zhang Lin Li Benke Kuai State Key Laboratory of Genetic Engineering Institute of Plant Biology School of Life Sciences Fudan University Shanghai 200433People's Republic of China National Key Laboratory of Plant Molecular Genetics and National Center for Plant Gene Research (Shanghai) Institute of PlantPhysiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200032 People's Republic of China

Leaf senescence can be triggered and promoted by a large number of developmental and environmental fac- tors. Numerous lines of evidence have suggested an involvement of phytochromes in the regulation of leaf senescence, but the related signaling pathways and physiological mechanisms are poorly understood. In this study, we initially identi- fied phytochrome-interacting factors （PIFs） 3, 4, and 5 as putative mediators of leaf senescence. Mutations of the PIF genes resulted in a significantly enhanced leaf longevity in age-triggered and dark-induced senescence, whereas overexpressions of these genes accelerated age-triggered and dark-induced senescence in Arabidopsis. Consistently, loss-of-function of PIF4 attenuated dark-induced transcriptional changes associated with chloroplast deterioration and reactive oxygen species （ROS） generation. ChlP-PCR and DualoLuciferase assays demonstrated that PIF4 can activate chlorophyll degradation regulatory gene NYE1 and repress chloroplast activity maintainer gene GLK2 by binding to their promoter regions. Finally, dark-induced ethylene.biosynthesis and ethylene.induced senescence were both dampened in pif4, suggesting the involvement of PIF4 in both ethylene.biosynthesis and signaling pathway. Our study provides evidence that PIF3, 4, and 5 are novel positive senes- cence mediators and gains an insight into the mechanism of light signaling involved in the regulation of leaf senescence.

关键词： phytochrome-interacting factor （PIF） leaf senescence chloroplast deterioration NYEI/SGR1 GLK2 ethylene.

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