抗除草剂转基因水稻对稻田杂草种群的影响   总被引：6，自引：0，他引：6  

余柳青  渠开山  周勇军  李迪  刘小川  张朝贤  彭于发 《中国水稻科学》2005,19(1):68-73

草铵膦作为抗除草剂转基因水稻的专用除草剂,对千金子、节节菜、陌上菜、丁香蓼、鳢肠、双穗雀稗、四叶萍和水竹叶表现出优良防效,但不能有效防治牛筋草、牛毛毡、矮慈姑、野荸荠和空心莲子草。在田间使用草铵膦可以有效防治早期出苗的无芒稗,但不能防治中后期出苗的莎草科和阔叶类杂草。与常规稻秀水11相比,转基因水稻99 1的每穗实粒数显著高于秀水11,从而获得了更高产量。转基因水稻嘉禾201与亲本丙94 02比较,对稻田主要杂草密度和生物量的影响差异不显著。转基因水稻99 1和嘉禾201对无芒稗的影响因子R显著大于化感潜力品种地谷,但与非化感品种秀水11相当,表明99 1和嘉禾201无化感竞争优势。  相似文献   

湖北省钟祥市南湖水生态环境评价   总被引：1，自引：0，他引：1  

张征 何力倪朝辉  翟良安吴振斌 《华中农业大学学报》2005,24(4):394-396

位于湖北省钟祥市城关郢中镇东的南湖,面积800hm^2,集观赏和水产养殖于一体。鱼产量为700t／a。该湖紧靠城市,直接纳人了未经任何处理的大量生活和工业污水,每天流量达40000t,造成水体严重富营养化,鱼类因栖息环境恶化而大量死亡,造成很大经济损失。鉴于此,笔者对南湖水生态环境进行了调查,旨在为南湖的综合治理提供科学依据。  相似文献   

转甜菜碱醛脱氢酶基因提高烟草抗旱及耐盐性   总被引：9，自引：0，他引：9  

司怀军  张宁  王蒂 《作物学报》2007,33(8):1335-1340

将甜菜碱醛脱氢酶（BADH）基因与组成型启动子CaMV 35S启动子融合,构建了植物表达质粒pBIBB。通过根癌农杆菌介导将BADH基因导入烟草,经PCR、Southern杂交、Northern杂交证明BADH基因已整合到烟草基因组中并在转基因植株中转录和表达。测定转基因植株叶片中甜菜碱醛脱氢酶活性,结果显示对照植株没有BADH酶活性,转基因植株的各个株系间甜菜碱醛脱氢酶比活力差异较大,范围在0.1~1.0 U mg-1间。转BADH基因的烟草在盐胁迫和聚乙二醇（PEG）胁迫条件下生长状态良好,生长势强于未转基因植株,说明BADH基因能在异源植物中正常翻译、表达和用于植物抗旱、耐盐基因工程的研究。  相似文献   

Antiproliferative activity of Citrus juices and HPLC evaluation of their flavonoid composition     

Camarda L  Di Stefano V  Del Bosco SF  Schillaci D 《Fitoterapia》2007,78(6):426-429

The antiproliferative activity of fresh fruit juices extracted from Citrus sinensis (cv. Washington Navel and cv. Sanguinello), C. deliciosa cv. Avana, C. clementina cv. Nules, C. aurantium subsp. myrtifolia , was evaluated against K562 (human chronic myelogenous leukemia), HL-60 (human leukemia) and MCF-7 (human breast adenocarcinoma) cell lines. All the juices tested showed antiproliferative activity. Moreover, the pattern of the main flavanone compounds in the juices has been determined by HPLC analysis.  相似文献   

美国白蛾——城市森林的大敌   总被引：1，自引：0，他引：1  

高明  邸艳君 《中国城市林业》2006,4(4):44-46

美国白蛾是世界性检疫害虫,在我国北方疫区较广,疫情严重危及城市生态安全,文章根据北京、唐山等地防治经验,总结了美国白蛾生物学特性及综合防治方法。    相似文献   

Virus Neutralizing Antibodies Against a Panel of 18 BVDV Isolates in Calves Vaccinated with Rispoval™ RS‐BVD     

C. Hamers  E. Di Valentin  C. Lecomte  M. Lambot  E. Joris  B. Genicot  P.‐P. Pastoret 《Zoonoses and public health》2000,47(10):721-726

Seven of nine colostrum‐deprived calves, free from infection with bovine virus diarrhoea virus (BVDV), were vaccinated with Rispoval^? RS‐BVD on two occasions, 21 days apart, while the other two were kept as BVDV infection controls. The virus neutralizing (VN) serum antibodies induced by vaccination were tested for their ability to neutralize 18 European BVDV isolates, including laboratory reference strains and recent field isolates, both cytopathic and non‐cytopathic biotypes as well as genotypes I and II. The strains were isolated in Belgium, France, Germany and the United Kingdom. While there were large variations in the vaccine‐induced VN titres of the individual calves against all the strains, e.g. the titres against Osloss NCP, the European reference strain ranged from 1.7 to 6.7 (1 : log₂), serum from each animal was capable of neutralizing between nine and all 18 of the strains tested. Nevertheless, from the results of this study, it can be concluded that in colostrum‐deprived BVDV seronegative calves, Rispoval^? RS‐BVD can stimulate the production of VN antibodies capable of neutralizing a wide range of antigenically diverse European isolates of BVDV, including genotypes I and II.  相似文献   

激光控制平地方法的经济可行性分析   总被引：6，自引：4，他引：2  

许迪  李益农  李福祥 《农业工程学报》2000,16(6):33-37

根据激光控制土地精平试验结果和不同田面平整精度处理下的田间畦灌对比试验数据,对激光控制平地成本费用和节水增产效果进行分析,完成激光控制平地方法的经济可行性分析。土地精平成本费用随田面平整绝对改善度的增加呈线性增长,节水增产效益随田面平整精度的提高明显增加。在激光精平效果3年持续期内,考虑激光控制平地设备折旧下的静态效益费用比值为1.8,动态下的相应比值为1.6。农田生产力提高带来的节水增产效益超过土地精平成本的事实表明,在我国现状条件下采用激光控制平地方法可以获得较好的收益回报。  相似文献   

鸡品种血浆碱性磷酸酶多态性研究     

刘娣  宋跃芬  祖延涛  杨秀芹  顾志刚  夏艳玲 《东北农业大学学报》2000,31(3):258-260

用改进的聚丙烯酰胺凝胶系统对 6个鸡品种的血浆碱性磷酸酶 ( AKP)进行了多态性检测 ,共检测到 13个区 (或位点 ) ,并对 7个区进行了表型、基因型和基因频率的统计和计算。在AKP位点检测到快、慢两条带 ,肉鸡 AA和伊莎褐均表现为快带  相似文献   

The evolution of lentil (Lens culinaris Medik.) cultivation in Italy and its effects on the survival of autochthonous populations     

Angela R. Piergiovanni 《Genetic Resources and Crop Evolution》2000,47(3):305-314

At the beginning of the 20th Century Italy was one of the most important producers of lentil in the Mediterranean basin. Presently, this pulse is mainly cultivated in marginal areas of Central and Southern Italy and in some small islands. As a result of the reduced attention devoted to lentil, several autochthonous populations have disappeared together with the traditions related to their cultivation. Moreover, how long the cultivation of those still grown today will continue is unpredictable. Governmental and local associations have a time window for anticipating a possible epoch when to grow these landraces will be no longer profitable. In the last decades the Germplasm Institute of the National Research Council (Bari, Italy) and the Institut für Pflanzengenetik und Kulturpflanzenforschung (Gatersleben, Germany) have collected 63 lentil populations in Italy, presently stored ex situ. The evaluation of this collection has shown the existence of an appreciable morphological, agronomic and genetic diversity that could foster future breeding programmes. It is concluded that there is an urgent need to promote the survival of lentil populations in situ, since this will further support the adaptation and evolution of autochthonous genotypes in their original environments.  相似文献   

Anaerobiosis in soybean root nodules under water stress     

Janet I. Sprent  Angela Gallacher 《Soil biology & biochemistry》1976,8(4):317-320

Soybean nodules subjected to water stress showed lowered C₂H₂ reducing activity and O₂ uptake, but enhanced CO₂ and ethanol evolution. Similar results were obtained with waterlogged nodules. The effects of stress could be partially or completely overcome by increaseing the O₂ supply. It is concluded that both water deficiency and excess may depress nitrogenase activity (C₂H₂ reduction) by restricting supplies of intermediates from aerobic pathways. At the same time fermentative pathways are stimulated and could lead to inhibitory concentrations of ethanol being produced. Both symbionts possess systems for ethanol production.  相似文献