多胺对果树生长发育的影响研究进展

概述了多胺对果树花粉管伸长、坐果、果实发育、根系和衰老的影响,以及多胺与逆境胁迫和植物激素的关系等。     

基于移动通信的林产品运输信息平台开发

基于移动通信的SMS、Mobile Web技术,开发林产品运输信息平台,可实现检尺员上传检尺短信后,实时采伐监控并加强运输监管。该平台有助于运输公司实现物流通知、空车配货,能提高服务质量,降低物流成本。系统架构成本、运营成本低,具有较强的市场竞争力。     

密度制约效应对啮齿动物繁殖的影响

啮齿动物种群动态调节是生态学中关键的问题之一,它与制定鼠害防治策略密切相关。目前,国内外学者已在相关领域取得大量的研究成果。整理了密度制约效应对啮齿动物繁殖影响的文献,包括在性器官、性成熟、性周期、繁殖指数、激素和行为的调节作用,同时分析该领域的研究途径及研究前景,旨在为今后的研究提供更多的思路。     

开发新客户10要

一要预约.预约时要饱含热情,还要争取各种有利条件,要使客户在不知不觉中意识到约会对他也很重要.没有预约就等于没有准备,高手不打无准备之仗.要知道,不预约就急于造访是非常失礼的行为.     

民和县个体育苗发展的思考

个体育苗是国营育苗的有利补充，而且也是群众致富的重要途径之一。但个体育苗存在技术含量低，苗木质量差，对市场需求反应敏感，波动起伏大等特征。实践证明，适度发展个体育苗有利于民和林业发展。     

长城799玉米品种在大同、朔州地区的产量表现及栽培

长城799是中国种子集团长城种子责任有限公司以祥249为母本,BM为父本选育而成的玉米新品种。2001-2006年通过天津市、陕西省、河北省、吉林省和山西省农作物品种审定委员会的审定。该品种优质、高产、稳产、适应性广、抗逆性强易于栽培。为了使长城799在大同、朔州地区发挥其最大的增产潜力,山西省农科院高寒所根据该品种在春播早熟区的表现,总结出了在大同、朔州地区种植的丰产栽培技术。     

新乡市不同肥力水平棉花“3414”肥料效应研究 Ⅰ.棉花氮、磷、钾优化施肥配比研究

通过棉花氮、磷、钾＂3414＂田间试验测得的数据,分别建立获嘉位庄高产田、延津东屯中高产田、卫辉虎头庄中低产田以籽棉产量为目标函数的氮、磷、钾三元二次回归模型,通过模拟仿真因素取值的频率分析,分别求得3个试点高产的N、P2O5、K2O最优施肥配比为：位庄高产点施N 380.3～394.94 kg/hm2、P2O5192.81～200.23 kg/hm2、K2O 297.80～311.4 kg/hm2,籽棉产量可达4 456.07～4 483.42 kg/hm2;延津东屯中高产点,施N 94.08～112.54 kg/hm2、P2O5 48.85～59.0 kg/hm2、K2O 263.34～277.96 kg/hm2,期望产量为3 906.63～3 962.18 kg/hm2;卫辉虎头庄中低产点,施N 243.76～271.59 kg/hm2、P2O5 210.48～214.00 kg/hm2、K2O 286.73～301.02 kg/hm2,期望产量为3 317.41～3 352.80 kg/hm2。并对各类模型的两因素互作效应及单因素效应作了剖析。     

Construction of a plant expression vector of chalcone synthase gene of <Emphasis Type="Italic">Ginkgo biloba</Emphasis> L. and its genetic transformation into tobacco

The chalcone synthase gene (chs) from Ginkgo biloba L. was cloned by PCR procedure. For constructing a plant expression vector of Gbchs, the gene was digested with XbaI and BamHI and inserted into the pBI121 vector. Gbchs was transferred into tobacco mediated by Agrobacterium tumefaciens LBA4404. PCR and Southern blot were performed, and the results showed that chs had been transformed into the genomic DNA of tobacco. The total flavones in the transformed tobacco leaves was extracted by the methanol extraction method and tested by UV spectrophotometry. The results showed that, compared to the control tobacco, the content in the transgenic tobaccos, n = 6, was generally higher, and the difference reached a significant level (P < 0.05) and highly significant level (P < 0.01), except one sample. Moreover, the highest sample was nearly 7.7 times greater than that of the controls. All these results show that utilizing genetic manipulations to improve plants in order to regulate flavone content by gene engineering may be an effective and hopeful method.     

Improvement on Mixograph test through water addition and parameter conversions

To improve Mixograph testing effect, Farinograph measurements were adopted as a quality standard and changes in water absorption and parameter conversion in Mixograph test were explored. Comparative study showed that increasing water absorption to about 73% and converting original parameters to compound parameters in Mixograph tests significantly increased their predictive power for flour quality. These efforts also enabled the adoption of fixed water addition level in Mixograph test and simplified the test procedure significantly. With the success in parameter conversions, Mixograph test results were successfully described by Farinograph parameters, which allow breeders to compare and exchange test results easily. All these changes optimized the official method of Mixograph test with simplified procedure and enhanced reliability and made the Mixograph being the superior tool for quality assessment in wheat-breeding programs.