Reaction of maize,sorghum and Johnson grass to Peronosclerospora sorghi

Development of sorghum downy mildew, incited by Peronoscleospora sorghi (Weston and Uppal) C.G. Shaw, on maize, sorghum and Johnson grass was investigated at two locations in Uganda during three seasons (1994 and 1995). More sorghum downy mildew developed on the Johnson grass and sorghum than on the maize at all locations and in all seasons. No significant differences were observed in sporulation of P. soghi on the three hosts. Leaf shredding occurred on the three hosts but was the least on maize. Cross-inoculation with both conidia and oospores was achieved on the three hosts. Since the fungal population formed oospores and sporulated readily on the three hosts, which is typical of the sorghum strain, the disease in Uganda is attributed to the sorghum strain.     

东北三省水稻遗传多样性和亲缘关系的SSR分析

以2006年辽宁、吉林、黑龙江三省水稻区域试验品种(系)为试材,采用SSR标记分析了东北三省35个水稻品种(系)的遗传多样性和亲缘关系,结果共检测出237个等位基因,分子量变异范围在95~320 bp。品种(系)间不同位点等位基因数目不等(2~8个),平均3.3857个,平均Nei基因多样性指数为0.4935,变幅为0.0328(PSM116)~0.8577(PSM363)。多态性位点的比率变化范围为71.25%~90.04%,多样性指数(H)介于0.3869~0.4903,信息指数(I)在0.6399~0.8489。吉林和黑龙江供试品种的SSR多样性低于辽宁水稻品系,而吉林和黑龙江基本相同。各稻区内品种的多样性均低于总体水平,显示了东北三省2006年水稻育种遗传基础的狭窄性。     

In Vitro Assessment of the Equine Hoof Wall Strains in Flat Weight Bearing and After Heel Elevation

Horseshoeing is a common practice, but effects on the hoof wall are poorly understood. Strain gauges were used to document and compare hoof behavior in vitro during flat weight bearing and after artificial heel elevation. Ten front limbs of Thoroughbred race horses, shod with conventional flat shoes, were used. Eight strain gauges were symmetrically distributed around the toe, quarters, and heels. Each limb was mounted to a testing machine (Kratos K5002; Kratos Dynamômetros, Ltda., Cotia-SP-Brazil) and subjected to a load equivalent to 30% of the donor's body weight. Strains (μ) were acquired by means of a computerized system and the results compared using Friedman and Wilcoxon statistical tests. There was greater strain variation when the heels were elevated. Compression predominated during flat weight bearing, with a tendency to horizontal traction after heel elevation. The changes in strain caused by heel elevation were not always symmetrical. Elevation of the heels tensed the toe and the medial quarter horizontally, increased load at the posterior portion of the hoof capsule, and hindered its expansion.     

几个常规水稻新品系产量比较研究

以辽宁省盐碱地利用研究所优势育种室最新育成的30份水稻新品系为试验材料,选用辽宁省目前主栽水稻品种辽粳9号和盐丰47为对照进行了产量比较试验。结果表明:参试的30个水稻材料中,有10个品系产量表现比较突出,其中P8、P10、P11、P9、P13和P25性状表现更加突出。建议表现优良的品系参加升级试验,优良性状结构可作为选种参考。     

基于灰色关联度的加工番茄新品系综合评价研究

[目的]筛选综合性状优良的加工番茄新品系。[方法]选用10个加工番茄新品系进行田间品种比较试验,测定其生育期、产量、室内理化指标。[结果]20040812果实性状好,加工性状中等,番茄红素含量较高,产量高,较对照增产8.3%,综合性状好;98D51×佳禾9号株高适中,加工性状中等,产量较低,但综合性状最好,最接近理想品种。[结论]98D51×佳禾9号、20040812可以进行下一步的品种区域化试验。     

部分云南粳稻品种的抗瘟性分类

 根据云南部分粳稻品种对7个菌系的反应型，将596个粳稻品种划分为35群。借助单基因鉴别品种，推断了50个品种的基因型。应用致病谱广的北方小种，筛选出一批新抗源，满足抗病育种对抗源的需求，也为系统的抗病基因分析奠定物质基础。     

吉林省部分水稻主栽品种抗稻瘟病性的研究

应用我省稻区的82个稻瘟病菌株接种,分析了吉林省历年种植的水稻品种的抗瘟性。结果表明:近几年新育成的品种抗瘟性已有较大的提高,九稻41、通丰8号和九稻33的抗性优异,抗谱在95%以上,九稻44、吉玉粳、丰选2号、九稻46、九稻42、九稻39、超产1号、超级稻1号和通粘8号等品种的抗谱也较高。同一品种对不同地区菌株的抗谱有较大差异,生产上可根据其在不同地区的抗性表现合理搭配种植。     

微生物发酵饲料在畜禽养殖中的发展现状及应用

随着现代发酵技术的发展,为了提高饲料利用率、改善饲料品质、消除环境污染,微生物发酵饲料在畜牧业中发展迅速,前景十分广阎.综述了微生物发酵饲料发酵菌种、作用机理及微生物发酵饲料的应用,分析了微生物发酵饲料目前存在的问题和发展前景.     

新形势下加快农业科研单位种业发展的实践与探索——以河南省农业科学院为例

文章结合当前我国种业发展的新形势,以河南省农业科学院为例,详细阐述了其种业发展历程、发展现状及存在的问题,并从创新种业科研体制机制、加快推进种子企业兼并重组、成立种业研究院、重视人才引进与培养、加强科企合作、组建高新技术集团等方面提出了加快农业科研单位种业发展的思路,以期为促进全国农业科研单位种业的快速发展提供参考。     

东北亚四国（地区）SMV株系毒力比较

将我国，韩国，日本及俄罗斯远东地区的ＳＭＶ株系与鉴别寄主交互接种测定其毒力。结果指出采用外国的株系鉴别寄坟难以区分我国株系毒力。同样，用我国鉴别寄坟也难以区分外国毒株的毒力，所测定的我国９个株系的１３个代表毒株全部能侵染最抗病的鉴别寄主韩国的Ｂｕｆｆａｌｏ和日本的Ｈａｒｏｊｏｙ。