Functional genomics in the rice blast fungus to unravel the fungal pathogenicity

A rapidly growing number of successful genome sequencing projects in plant pathogenic fungi greatly increase the demands for tools and methodologies to study fungal pathogenicity at genomic scale. Magnaporthe oryzae is an economically important plant pathogenic fungus whose genome is fully sequenced. Recently we have reported the development and application of functional genomics platform technologies in M. oryzae. This model approach would have many practical ramifications in design and implementation of upcoming functional genomics studies of filamentous fungi aimed at understanding fungal pathogenicity.     

九顶山地区植物群落区系分类研究

对九顶山植物群落野外调查，得到种子植物115科413属613种。通过植物区系成分分析可知，该区区系比较复杂，15种分布类型在谈区均有分布。区系特征如下：具有明显的温带性质，温带成分236属，占总属的57．14％，而且以北温带分布（108属）为主；与热带有一定的亲缘关系。热带成分130属，占31．48％；中国特有植物多，17属18种；区系起源古老。为谈区域物种保护和植被区划提供理论依据。     

汉英植物象征文化的思维方式对比

受不同民族文化诸多因素的影响,中西方植物的象征意义异大于同,但从其所赋予象征意义的植物来看,中西方民族赋予植物象征意义的思维方式, 除了谐音差异外,在其它方面有着很大的相似性.     

濒危植物木根麦冬的胚胎学研究

木根麦冬的花药壁分为4层,即:表皮、药室内壁、中层与绒毡层。绒毡层为腺质型。大孢子母细 胞减数分裂过程中的胞质分裂为连续型。小孢子四分体排列为左右对称型与四面体型。雌蕊子房壁在 授粉后4～5天破裂。胚珠倒生,双珠被,厚珠心。大孢子四分体线形排列,胚囊发育为蓼型。极核在受 精前融合成一个大的次生核。胚胎发育为紫菀型。核型胚乳。木根麦冬居群中存在雄性不育植株,约 占55．8％。胚胎在其发育早期约有43．3％败育。根据本研究的实验观察,(1)雄性不育和自花授粉以 及低效率的传粉机制而导致的异花传粉的失败;(2)部分胚胎的败育;(3)子房壁破裂而导致胚珠裸露等是木根麦冬有性生殖过程中的薄弱环节,也可能是导致该植物濒危的部分因素。     

大冶铁矿为日本创建八幡制铁所提供矿石史实新探

文章根据《日本外交文书》等原始资料,揭示日方1899年与盛宣怀签订《煤铁互售合同》的幕后操作过程、真实意图,并考察合同执行后的初期效应及其对于中日两国近代钢铁工业发展的重大影响。     

Impact of elevated CO2 concentration under three soil water levels on growth of Cinnamomum camphora

Forest plays very important roles in global system with about 35% land area producing about 70% of total land net production. It is important to consider both elevated CO2 concentrations and different soil moisture when the possible effects of elevated CO2 concentration on trees are assessed. In this study, we grew Cinnamomum camphora seedlings under two CO2 concentrations （350 μmol/mol and 500μmnol/mol） and three soil moisture levels [80%, 60% and 40% FWC （field water capacity）] to focus on the effects of exposure of trees to elevated CO2 on underground and aboveground plant growth, and its dependence on soil moisture. The results indicated that high CO2 concentration has no significant effects on shoot height but significantly impacts shoot weight and ratio of shoot weight to height under three soil moisture levels. The response of root growth to CO2 enrichment is just reversed, there are obvious effects on root length growth, but no effects on root weight growth and ratio of root weight to length. The CO2 enrichment decreased 20.42%, 32.78%, 20.59% of weight ratio of root to shoot under 40%, 60% and 80% FWC soil water conditions, respectively. And elevated CO2 concentration significantly increased the water content in aboveground and underground parts. Then we concluded that high CO2 concentration favours more tree aboveground biomass growth than underground biomass growth under favorable soil water conditions. And CO2 enrichment enhanced lateral growth of shoot and vertical growth of root. The responses of plants to elevated CO2 depend on soil water availability, and plants may benefit more from CO2 enrichment with sufficient water supply.     

植物表达双价抗虫载体pCAMBIA3300-bt-pta的构建

本研究将苏云金芽孢杆菌（bt）与半夏凝集素抗虫基因（pta）两类抗虫基因连接到具有高效性的植物表达载体pCAMBIA3300中,重组表达质粒分别经过ApaⅡ单酶切及xhoⅠ和KpnⅠ双酶切鉴定、分析后,实验结果表明含有双价抗虫基因pCAMBIA3300-bt-pta的植物重组表达质粒已构建成功。     

A kinetic approach to evaluate salinity effects on carbon mineralization in a plant residue-amended soil

The interaction of salinity stress and plant residue quality on C mineralization kinetics in soil is not well understood. A laboratory experiment was conducted to study the effects of salinity stress on C mineralization kinetics in a soil amended with alfalfa, wheat and corn residues. A factorial combination of two salinity levels （0.97 and 18.2 dS/m） and four levels of plant residues （control, alfalfa, wheat and corn） with three replications was performed. A first order kinetic model was used to describe the C mineralization and to calculate the potentially mineralizable C. The CO2-C evolved under non-saline condition, ranged from 814.6 to 4842.4 mg CO2-C/kg in control and alfalfa residue-amended soils, respectively. Salinization reduced the rates of CO2 evolution by 18.7%, 6.2% and 5.2% in alfalfa, wheat and corn residue-amended soils, respectively. Potentially mineralizable C （Co） was reduced significantly in salinized alfalfa residue-treated soils whereas, no significant difference was observed for control treatments as well as wheat and corn residue-treated soils. We concluded that the response pattern of C mineralization to salinity stress depended on the plant residue quality and duration of incubation.     

1999-2000年中国男子篮球甲A联赛北京首钢队主场比赛技战术特点分析

全国男子篮球甲 A联赛 (CBA ) ,是目前中国国内篮球最高级别的比赛。首钢男篮作为一支老牌甲级劲旅 ,本赛季队伍有所调整 ,新老队员交替后 ,主力阵容重新组合 ,技战术风格随之改变。采用临场技术统计、跟综调研、数据分析和归纳整理等方法 ,对首钢男篮主场比赛进行综述 ,针对主要技战术指标加以分析。旨在为包括首钢队在内的所有男篮队伍及篮球爱好者提供有价值和可借鉴比较的素材 ,使他们从一个侧面了解我国男篮甲级队伍的一般情况 ,以便于有针对性地训练提高自身的水平。本文分析结果是 :首钢队主场进攻以内为主、内外结合 ;防守以针对性半场扩大盯人为主。全队主力队员特点突出 ,但打球人数过于集中 ,导致技战术变化少。其当务之急是培养年轻选手 ,提高全队整体实力。     

利用当地植物自制土农药

利用博落回,羊踯躅等植物制成土农药,杀灭病虫害效果好,成本低、无污染。