烤烟气候性斑点病与植株和土壤的营养关系

针对在玉溪市烤烟生产上常发生的烤烟气候性斑点病问题,采用田间调查、采集配对样品与室内检测分析相结合的方法,以根际土壤及植株各部位叶片等为探索对象,从病害在田间分布及叶片养分变化等方面开展了研究.结果表明,在烤烟初花期气候性斑点病发生叶位以第4～7叶位(由下至上)的叶片发生较多(占83.5%);发生气候性斑点病的烟株,内因是由于植株N、Ca、Mg含量过高而K含量不足,从而提高了N/K、Mg、/K及Ca/K比值,导致N、K、Ca、Mg营养不平衡,而外因气候条件只是一个诱发因子.其根本原因是由于土壤有效氮(特别是速效的NO3与NH4+)及交换性Ca、Mg含量过高,有效K含量过低所致.     

Molecular mapping of QTLs for gluten strength as measured by sedimentation volume and mixograph in durum wheat (Triticum turgidum L. ssp durum)

Quantitative trait loci (QTLs) responsible for gluten strength measured by SDS-sedimentation volume (SV), mixograph and grain protein content (GPC) were located on the molecular linkage map of a durum wheat recombinant inbred line population. QSv.macs-1B.1 flanked by Xgwm550–Glu-B3 was the most consistent QTL for SV identified in all the environments. The same QTL was also associated with mixograph peak energy, peak time and total energy. The Glu-B1 locus was at the center of another QTL responsible for SV, while, Glu-B2 influenced SV as well as mixograph peak energy and peak time. Apart from glutenin coding loci, QTLs influencing mixing parameters and GPC were located in three other marker intervals Xwmc48.2–Xpsp3030 (4B), Xgwm573–Xbarc231.1 (7A) and Xgwm46–Xgwm540.1 (7B). A total of 26 main effect QTLs and 10 digenic epistatic interactions (QQ) for quality traits were distributed over 11 chromosomes. Out of these, seven main effect QTLs and three QQ interactions were involved in interactions with environments (QE, QQE). The results indicated that along with chromosome 1B, chromosomes 4B, 7A and 7B are also important for improvement of gluten strength and GPC in durum wheat.     

高校产业发展与科技创新

以高校产业发展为背景,探讨了我国高校产业发展的现状及其制约因素,提出科技创新是高校产业发展的基础、保证和动力,其中最主要的是体制创新、管理创新、机制创新和产学研有机结合。     

景宁木兰濒危原因初探

调查了景宁木兰的种群数量、开花物候、花部性状、花粉流及授粉方式,总结了景宁木兰的花期和花器官构造等特征,分析了景宁木兰濒危的原因,并提出采取人工授粉等措施,以提高景宁木兰的结果率.     

文心兰品种变异RAPD分子检测技术的建立及应用

通过对DNA提取方法的改良,随机引物的选择、RAPD反应条件的筛选,建立文心兰品种变异RAPD分子标记检测技术。利用该技术对3个母本园品种和1个试管苗品种进行RAPD检测,结果是品种“黄金2号”和“黄金3号”未发现变异;7个引物对品种“新奇士”共扩增出63条清晰带,3个样品带型发生变化,样品变异率为10％;14个引物对“黄金2号”试管苗共扩增出119条清晰带,9个样品带型发生变化,样品变异率为9．4％。结果表明,该技术能有效用于文心兰品种的变异检测。     

优质、高产杂交稻新组合泸优5648特征特性及栽培技术

泸优5648系福建省南平市农科所用泸香90A与自选恢复系南恢5648配组选育而成的优质、高产的杂交稻新组合,具有广泛的推广潜力和应用价值.该组合2003年参加品比试验和多点试种,同年在福建省第二届优质稻品种(组合)招标评选中中标;2004年参加福建省中稻优质组区试,表现突出,2005年续试与生产试验同步进行,2006年通过福建省农作物品种审定委员会审定(闽审稻2006015).     

Chilled Storage of Pangasianodon hypophthalmus Fillets Coated with Plant Oil Incorporated Alginate Gels: Effect of Clove Leaf,Clove Bud,Rosemary and Thyme Oils

Essential oil incorporated alginate coating provides a novel way to improve the safety and shelf life of pangasius (Pangasianodon hypophthalmus) fillet. Oils from the leaves and buds of clove, flowering tops of rosemary, and dried seeds of thyme were incorporated separately in alginate coating. All the plant oils showed antibacterial activity, but the zone of inhibition was relatively larger for thyme oil. Alginate coating was performed using sodium alginate (1.5%), glycerol (10%), and calcium chloride (2%) and plant oil at 1% (v/v). The coated fillets were stored under chilled conditions and samples were analyzed for bacteriological, chemical, sensory, color, and texture parameters. Psychrotrophic counts crossed 7 log cfu/g by the 13^th day and 15^th day of chilled storage in control and plant oil treated fillets, respectively. The peroxide value of treated fillets was relatively low. Texture profile analysis indicated that plant oil incorporated alginate coating reduced the rate of loss of texture (softening) during chilled storage. Plant essential oil incorporated alginate gels were relatively better compared to control fillets in preserving pangasius fillet quality during chilled storage, and incorporation of thyme oil was relatively better compared to clove leaf oil, clove bud oil, and rosemary oils.     

Photodegradation of fenarimol

The photodegradation of aqueous alcoholic solutions of fenarimol at λ ≥ 250 nm has been examined. UV irradiation of an aqueous methanolic solution for 24 h yielded two photoproducts, identified as 2,4′‐dichlorobenzil and p‐chlorobenzoic acid, while irradiation of a solution in aqueous isopropanol yielded p‐chlorobenzoic acid and two additional products identified as 2,4′‐dichlorobenzophenone and o‐chlorobenzoic acid. A mechanism for the formation of the photoproducts is suggested. © 2000 Society of Chemical Industry     

Effect of Curculigo orchioides rhizomes on sexual behaviour of male rats

The rhizomes of Curculigo orchioides have been traditionally used as aphrodisiac. In the present study ethanolic extract of rhizomes was evaluated for its effect on sexual behavior in rats. Administration of 100 mg/kg of extract change significantly the sexual behavior as assessed by determining parameters such as penile erection, mating performance, mount frequency and mount latency. Moreover a pronounced anabolic and spermatogenic effect was evidenced by weight gains of reproductive organs. The treatment also markedly affected sexual behavior of animals as reflected in reduction of mount latency, an increase in mount frequency and enhanced attractability towards female. Penile erection index was also incremented in treated group.     

黔油18号高产综合农艺措施数学模型研究

【目的】为明确影响高原生态区黔油18号油菜产量的关键因子及实现高产高效优化栽培的综合农艺措施。【方法】运用四因素二次回归最优组合设计试验方法,在海拔950~1200m的高原生态区对优良杂交油菜新品种黔油18号的主要栽培措施施氮量、施磷量、施钾量与油菜产量的量化关系进行系统研究,通过建立数学模型的优化与解析,【结果】结果表明,在4因素中,对黔油18号的影响为氮肥>密度>磷肥>钾肥;【结论】要获得≥2493.46kg/hm2的产量,其最佳栽培措施组合是：保持密度13.60~14.50万株/hm2,氮肥291.35~330.00kg/hm2,磷肥92.28~102.2746kg/hm2,钾肥119.20~129.20kg/hm2。