高产抗病柱花草新品种选育 II高产抗病柱花草品种比较

于 1998 - 2 0 0 0年选择 12个柱花草Stylosanthesguianensis新种质进行品种比较 ,结果表明 :Mineirao柱花草、GC15 81柱花草年干草产量分别为 116 5 0 0kg/hm2 和 114 2 0 0kg/hm2 ,高于热研 5号柱花草 (9831 1kg/hm2 ) 18 5 0 %和 16 16 % ;抗旱性强 ,在冬春低温干旱季节的干质量占年产量的 2 9 2 5 %和 2 9 15 % ;较抗柱花草炭疽病 ,试验期内平均病级分别为 1 6 7,1 74 ;植株越冬存活率分别为 30 83%和 4 1 6 8% ,耐寒性强 ;茎叶比为 1 0 3和 1 0 7,营养价值丰富 ,营养生长期粗蛋白含量分别为 15 36 2 %和 11 5 5 0 % ,是优良的柱花草新品种。     

鹰咀豆品比研究

本文从世界热带半干旱作物研究中心“ＣＩＣＲＩＳＡＴ”引入鹰咀豆（ＣｉｃｅｒａｒｉｔｉｎｕｍＬ．）品种材料１１２份，在引种筛选的基础上筛选出１７个优秀品种材料，进一步作了品比试验，得到：Ａ３、Ａ２１、Ｂ５、Ｂ７、Ｂ１０、Ｃ１、Ｄ４、Ｄ５８个引入品种。它们抗性强，植株发育生长良好，分枝多，结英率高，种子在甘肃河西走廊可完全成熟，百粒重、籽实产量等均显著地优于当地品种。可在甘肃部分干旱半干旱地区示范性推广，丰富种质资源。     

SSR-based genetic linkage analysis of resistance to crown rust (Puccinia coronata f. sp. lolii) in perennial ryegrass (Lolium perenne)

Crown rust (caused by Puccinia coronata f. sp. lolii) is a serious foliar disease of the pasture and turfgrass perennial ryegrass (Lolium perenne). Previous genetic studies have detected both qualitative and quantitative resistance mechanisms, and interpretation of the genetic system is complicated by variation within the sexually reproducing pathogen. Resistant and susceptible parental genotypes of ryegrass were identified using a composite urediniospore population collected from three geographically distinct locations. A two-way pseudo-testcross mapping population was obtained as the F₁ progeny of the pair-cross between ryegrass parental genotypes Vedette₆ and Victorian₉. Both parents showed intermediate resistance against a pathogen population collected in a single geographical zone (Hamilton, Victoria), but in the F₁ population, significant variation for a range of resistance-associated characters was detected. Statistical analysis of phenotypic data suggested a major gene effect, hence bulked segregant analysis with map-assigned simple sequence repeat (SSR) markers was used to scan the genome. A marker showing strong association with resistance was assigned to linkage group (LG) 2 of perennial ryegrass. Analysis of 11 LG2 SSR markers defined an interval between loci xlpssrh03f03 and xlpssrk02e02 as containing the gene or genes (LpPc1) conferring crown rust resistance. Resistance gene determinants were inherited from both parents, with up to 80% of the total phenotypic variation explained by markers segregating from Vedette₆ and up to 26% of the variation explained by markers segregating from Victorian₉. The two contributions together resulted in an additive increase in effect, with fully resistant individuals requiring determinants from both parents. A conserved syntenic relationship was observed with linkage group B of Avena strigosa, which is the location of a cluster of resistance genes to the oat form of crown rust. The implications of this study for marker-assisted selection of disease resistance in perennial ryegrass are discussed.     

Genomics in equine veterinary medicine

Veterinary medicine is marching forward with genomics grasped firmly in one fist. Genomics has been part of our veterinary tool bag for some time in various guises, but the breadth and depth of its ramifications can be daunting. This article is designed to provide toe‐holds for veterinarians to enjoy a better understanding of genomics – a truly fascinating area of science.     

美仁牦牛肉不同部位常规营养成分及氨基酸和脂肪酸测定分析

摘 要：选取放牧条件下体况良好、体重相近的甘南成年美仁公牦牛 6 头、母牦牛 4头进行屠宰,采取美仁牦牛肉的肩甲、背最长肌、股二头肌三个部位的分割肉。测定不同部位营养成分、氨基酸和脂肪酸。 结果显示：不同部位美仁牦牛肉的蛋白质含量为22.97%～23.07%,其中股二头肌蛋白质含量最低,背最长肌最高;脂肪含量为1.27%～2.49%,股二头肌脂肪脂肪含量较低,不足1.27%。氨基酸含量丰富,脂肪酸总量依次为肩甲、背最长肌、股二头肌上脑肉。通过对比分析不同部位美仁牦牛肉中营养成分、氨基酸和脂肪酸等含量存在差异。     

奶牛乳房炎相关功能基因组学与蛋白质组学研究进展

功能基因组学与蛋白质组学是在基因组和蛋白质整体水平上分析基因功能,研究技术包括差异显示反转录PCR、表达序列标签、基因表达系列分析、生物芯片、RNA干涉、生物信息学、二维凝胶电泳(2-DE)、质谱(MS)等.综述了功能基因组学和蛋白质组学及其研究技术在奶牛乳房炎相关的基因表达、抗性候选基因鉴定、病原微生物蛋白质组学、基因治疗、新诊断靶标筛选等的应用研究进展及展望.     

转基因生物安全监管模式及我国转基因生物安全立法研究

以环境生态威胁和食品安全为主要内容的生物安全问题日益引起人们重视,尽快建立和完善科学的法律规制框架是当务之急。作者通过对国内外生物安全管理体制的比较和分析,提出进一步完善我国生物安全法律规制框架的建议。     

草莓新品种引进比较试验

为了解决东海县草莓品种单一及品种退化的问题,实现草莓品种的更新换代,提高草莓品质及经济效益,从江苏省农业科学院、北京神舟绿鹏农业科技有限公司等单位引进了紫金久红、章姬、隋珠、脱毒红颜等9个草莓品种进行比较试验.结果表明:脱毒红颜、妙香植株长势好、田间综合性状较好,具有果形端正、光泽度高、口感细腻、产量高等特点,比较适宜...     

定西市农业比较优势分析及特色农业发展对策

利用1999~2003年的农业统计资料,计算了定西市主要农作物的规模、产量和综合比较优势指数。结果表明,当归、党参、花卉、马铃薯、蚕豆的种植规模省际优势明显,各农作物的单产省际优势不明显,党参、当归、马铃薯、花卉的综合省际优势明显;除花卉外,胡麻、中药材、马铃薯、谷子的种植规模全国优势突出,中药材、蚕豆、胡麻的单产全国优势明显,中药材、胡麻、马铃薯、谷子的全国综合优势明显。以上结果表明定西市的中药材、马铃薯和花卉最具有资源比较优势,其次是小杂粮和胡麻,而其它农作物不具备资源比较优势。在此基础上,分析了特色农业发展的有利条件和存在问题,提出了适合定西市现有经济发展水平的特色农业发展对策,如尽快制定特色农业发展规划,建立特色农产品基地;加强政府部门的职能,积极扶持龙头企业,打造地方特色农产品品牌;提升专业化市场的层次,构建农产品销售网络体系;积极推广农业科技,提高特色农业的科技含量等。