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Possible Involvement of Reactive Oxygen Species Scavenging Enzymes in Desiccation Sensitivity of antiaris toxicaria Seeds and Axes

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Journal of Integrative Plant Biology 2008年第12期50卷 1549-1556页

作者： Hong-Yan Cheng Song-Quan Song Institute of Botany the Chinese Academy of Sciences Beijing 100093 China

The relationships among desiccation sensitivities of antiaris toxicaria seeds and axes, changes in activities of superoxide dismutase （SOD）, ascorbate peroxidase （APX）, catalase （CAT）, glutathione reductase （GR） and dehydroascorbate reductase, （DHAR）, production rate of superoxide radical （.O2^-）, and the contents of hydrogen peroxide （H2O2） and thiobarbituric acid （TBA）-reactive substance were studied. Desiccation tolerance of seeds and axes decreased with dehydration. Desiccation tolerance of axes was higher than that of seeds, and that of epicotyls was higher than radicles. Activities of SOD, CAT and DHAR of seeds increased during the initial phase of dehydration, and then decreased with further dehydration, whereas activities of APX and GR decreased with dehydration. These five enzyme activities of axes, however, increased during the initial phase of dehydration, and then decreased with further dehydration. The rate of superoxide radical production, and the contents of H2O2 and TBA-reacUve products of seeds and axes gradually increased with dehydration. These results show that the A. toxicaria seed is a typical recalcitrant seed. Loss of desiccation tolerance in seeds and axes was correlated with the increase in .O2- production rate, content of H2O2 and TBA-reactive products, and the decline of antioxidant enzyme activities of seeds and axes.

关键词： antiaris toxicaria antioxidant enzyme content of H2O2 and thiobarbituric acid-reactive product O2^- production rate recalcitrant seed.

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A new cytotoxic cardenolide from the latex of antiaris toxicaria

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Chinese Chemical Letters 2009年第4期20卷 450-452页

作者： Yu Juan Gan Wen Li Mei You Xing Zhao Hao Fu Dai Institute of Tropical Bioscience and Biotechnology Chinese Academy of Tropical Agricultural Sciences Haikou 571101 China State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China

A new cardenolide, toxicarioside E （1）, was isolated from the latex ofantiaris toxicaria （Pers.） Lesch （Moraceae）. Its structure was elucidated on the basis of spectral data and chemical evidence. Compound 1 showed significant cytotoxicity against K562 and SGC-7901 cell lines in vitro by MTT method with the IC50 value of 0.026 and 0.027 μg/mL, respectively.

关键词： antiaris toxicaria Moraceae Toxicarioside E Cardenolide Cytotoxicity

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The Equilibrium Moisture Content of Five Lesser Utilized Species of Ghana Contrasted with Three European Species

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Open Journal of Composite Materials 2022年第2期12卷 73-81页

作者： Gladys A. Quartey John Frank Eshun Emmanual Yaw Wereko Department of Interior Design Technology Takoradi Technical University Takoradi Ghana

Equilibrium moisture contents (EMC) of wood species are very necessary in the utilization of these in service. This study investigated the EMC of five lesser utilized species of Ghana and compared it with that of three European species. Sixteen randomly sampled specimens of each of the eight species (heartwood and sapwood) with dimensions 3 cm × 3 cm × 3 cm were exposed at various relative humidity conditions of 30%, 45%, 60%, 75% and 90% in a temperature and humidity-controlled climate chamber at a temperature of 25°C in accordance to German standard DIN 52182. The species are Albies alba, Fagus sylvatica and Picea abies which are European species and Amphimas pterocarpoides, antiaris toxicaria, Canarium schweinfurthii, Celtis zenkeri and Cola gigantea are wood species from Ghana. Internal wood temperature and humidity were measured with datalogger. Samples were considered to have reached equilibrium at any given humidity when the daily weight changes were less than 0.1 mg according to German standard DIN 52183. After the last measurements of the weight changes, the samples were dried at 103°C until there was a constant weight. The five tropical hardwoods had low sorption values recorded and high sorption values for the European species and this could be attributed to differences in the microstructure of these woods.

关键词： Albies alba Fagus sylvatica Picea abies Equilibrium Moisture Content Amphimas pterocarpoides antiaris toxicaria Canarium schweinfurthii Lesser Utilized Hardwood Species

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