二十三个柚品种特性评价     

陈竹生  陈全友  江才伦  吴云伦  郭天池  聂华堂  计玉  甘俊新 《中国南方果树》1993,(2)

对1965年定植的23个柚(Citrus grandis Osbeck)品种进行了20多年的性状比较。筛选出矮化类型6个,早熟和晚熟类型各3个,丰产类型6个,品质优良类型11个。发现仅有部分柚品种富含维生素C;果汁中维生素C含量与酸含量呈明显负相关。证实长寿沙田柚中的冬瓜圈和古老钱两个选系比广西沙田柚更丰产优质;垫江白柚质优,但产量低。简述了各参试品种的利用前途。  相似文献   

鹰咀豆品比研究   总被引：2，自引：2，他引：0  

胡延凯  聂朝相 《草业学报》1994,3(1):56-61

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。  相似文献   

稀土对阿尔巴斯白绒山羊瘤胃发酵,消化代谢及其生产性能的影响   总被引：5，自引：0，他引：5  

桂荣  刘少卿 《畜牧兽医学报》1995,26(6):515-521

实验１用４只安装永久性瘤胃漏管的阿尔巴斯白绒山羊（母），进行瘤胃消化代谢试验；实验２用６只成年母绒山羊进行消化代谢试验；试验３选用同品种成年妊娠母羊进行放牧补饲实验。实验１得出，稀土的使用可促进瘤胃内ＮＨ３－Ｎ的利用；细菌数比对照组提高３５．６７％；丙酸产量提高２８．６３％。实验２得出，稀土可提高绒山羊日粮ＤＭ、ＯＭ、ＧＥ及ＡＤＦ消化率，分别为１１．５８％、１２．２７％、１６．６９％和２６．２９％；每日氮存留率比对照组提高１８０．１％。实验３得出，稀土组产绒量比对照组提高８．９０％。  相似文献   

β-葡聚糖对肉仔鸡生产性能及免疫功能的影响   总被引：6，自引：0，他引：6  

李志清  呙于明  袁建敏  聂伟 《中国家禽》2004,26(9):39-42

选用1日龄AA肉仔鸡480只(公雏),随机分为5个处理组。每个处理6个重复,对照组饲喂基础日粮,抗生素组饲喂基础日粮 林可霉素,三个β-葡聚糖组,在基础日粮中分别添加25、50、100mg/kgβ-葡聚糖,以研究添加β-葡聚糖对肉鸡生产性能、免疫器官、细胞和体液免疫、血清中溶菌酶含量以及盲肠内乳酸杆菌的影响。结果显示:肉仔鸡日粮中添加50mg/kgβ-葡聚糖,显著提高0～49日龄日增重和饲料转化效率(P<0.05);显著提高21日龄脾脏的相对重量(P<0.05);添加β-葡聚糖有提高非特异性免疫力的趋势。  相似文献   

亚麻工艺长相关性状的通径分析     

聂征  陈甫堂  李春霞 《中国麻业》1993,(2)

本试验以6个普通亚麻品种为材料,进行工艺长相关性状的通径分析。结果表明,5个相关性状对工艺长度影响大小顺序为:单株粒重>单株粒数>千粒重>株高>主茎分枝数。降低单株粒重是提高工艺长度的主要途径。在千粒重、单株粒重相对稳定的类型中,选择植株较高、单株粒数较多者,或在株高、单株粒数相对稳定的类型中,选择千粒重较高者是提高工艺长度的重要途径。减少主茎分枝数亦可有效提高工艺长度,但作用较小。  相似文献   

A Comparison of Techniques for Preparing Somatic Chromosomes in Ribes Species     

DingXiaodong YanLibo 《东北农业大学学报(英文版)》1996,3(1):55-62

Ribes plants,like most of other fruit trees ,are characterized by their large number but small size of somatic chromosomes.In the light of these spccial characteristies,we have examined several factorial combinations of material,pretreatment,slide preparing method and stain to identify the most promising techique for studying the chromosomes and further analyzing the karyotypes and chromosome banding of Ribes plants.The resuts indicated that the combination of root tip with pretreatment of 2m molL^-1 8-hydroxyquinoline plus 0.05% colchicine or 0.3% balm for 3-5 hours at 14℃,pre-hypotonic treatment of 0.07mol L^-1 KCl for 30min,fixation in Carnoy‘s fluid,hydrolysis in 5% cellulase and 5% pectinase mixture for 4-5 hours at 25℃,post-hypotoic treatment in distilled water for half an hour and staining in Giemsa Could make the chromosome preparation superior to other treatment combinations.  相似文献   

赤羽病微量病毒中和试验诊断方法的研究   总被引：6，自引：1，他引：5  

刘焕章  李树清  吴东来  李健  陈健康  王巧金  陆晓东  胡永强 《中国预防兽医学报》2001,23(1):53-55

应用引自日本的赤羽病病毒，制备了微量病毒中和试验抗原和高免阳性血清，建立了赤羽病微量病毒中和试验诊断方法，应用此方法对广东省７２４头牛血清进行了检查，阳性率为３５．３％，对上海６６５头牛血清作了检查，阳性率为６７．７％，说明这些地区曾流行过赤羽病，同时对澳大利亚当地牛１０８头进行检查，阳性率为５５．５％，与外报道一致。对澳大利亚、加拿大，美国进口牛１７３头的检查结果，全部阴性，对澳大利亚进口羊９９２头的检查结果，发现阳性１头，已得到澳方认可。  相似文献   

‘Plantibodies’: a flexible approach to design resistance against pathogens     

A. Schots  J. De Boer  A. Schouten  J. Roosien  J. F. Zil Verentant  H. Pomp  L. Bouwman-Smits  H. Overmars  F. J. Gommers  B. Visser  W. J. Stiekema  J. Bakker 《European journal of plant pathology / European Foundation for Plant Pathology》1992,98(2):183-191

Engineering resistance against various diseases and pests is hampered by the lack of suitable genes. To overcome this problem we started a research program aimed at obtaining resistance by transfecting plants with genes encoding monoclonal antibodies against pathogen specific proteins. The idea is that monoclonal antibodies will inhibit the biological activity of molecules that are essential for the pathogenesis. Potato cyst nematodes are chosen as a model and it is thought that monoclonal antibodies are able to block the function of the saliva proteins of this parasite. These proteins are, among others, responsible for the induction of multinucleate transfer cells upon which the nematode feeds. It is well documented that the ability of antibodies to bind molecules is sufficient to inactivate the function of an antigen and in view of the potential of animals to synthesize antibodies to almost any molecular structure, this strategy should be feasible for a wide range of diseases and pests.Antibodies have several desirable features with regard to protein engineering. The antibody (IgG) is a Y-shaped molecule, in which the domains forming the tips of the arms bind to antigen and those forming the stem are responsible for triggering effector functions (Fc fragments) that eliminate the antigen from the animal. Domains carrying the antigen-binding loops (Fv and Fab fragments) can be used separately from the Fc fragments without loss of affinity. The antigen-binding domains can also be endowed with new properties by fusing them to toxins or enzymes. Antibody engineering is also facilitated by the Polymerase Chain Reaction (PCR). A systematic comparison of the nucleotide sequence of more than 100 antibodies revealed that not only the 3′-ends, but also the 5′-ends of the antibody genes are relatively conserved. We were able to design a small set of primers with restriction sites for forced cloning, which allowed the amplification of genes encoding antibodies specific for the saliva proteins ofGlobodera rostochiensis. Complete heavy and light chain genes as well as single chain Fv fragments (scFv), in which the variable parts of the light (V_L) and heavy chain (V_H) are linked by a peptide, will be transferred to potato plants. A major challenge will be to establish a correct expression of the antibody genes with regard to three dimensional folding, assembly and intracellular location.  相似文献   

蝴蝶花的组织培养和根状茎的诱导     

赵宏波  陈发棣  房伟民  张聂  郭维明 《园艺学报》2005,32(3):556-556

蝴蝶花(IrisjaponicaThunb.)是鸢尾科鸢尾属的多年生常绿宿根草本植物,地下有横走的根状茎;耐荫,是良好的耐荫地被植物。试验于2003年10月至2004年5月进行。选择健康的蝴蝶花植株,取地下的根状茎,选带节的茎段作为外植体,用洗洁精溶液浸泡4～5min,采用75%乙醇60s结合0.1%HgCl212min进行灭菌。根状茎在培养基MS 6BA1.0mg·L-1 KT2.0mg·L-1 NAA0.1mg·L-1,25℃下黑暗培养,腋芽出芽率达65.4%。黑暗比光照更有利于腋芽的萌发,可能是由于蝴蝶花是阴性植物;在自然条件下其根状茎的生长和顶芽的萌发处于暗环境,离体条件下黑暗培养更符合其…  相似文献   

Characteristics for Practical Use of Attenuated Isolate UA-Fukushima of <Emphasis Type="Italic">Tomato mosaic virus</Emphasis>     

Tsutomu MATSUMOTO  Yuichiro NARA  Hiromitsu FURUYA  Harumi TAKAHASHI  Kiichi TAIRAKO  Hideki YAMAMOTO 《Journal of General Plant Pathology》2002,68(4):382-384

L₁₁A-Fukushima (L₁₁A-F) derived from attenuated isolate LuA of Tomato mosaic virus (ToMV) has the highest ability to cross protect against virulent ToMV among LuA and its derivatives and is stably inherited. Growth, yield, fruit quality and symptom attenuation of inoculated tomato plants did not differ significantly between L₁₁A-F and L₁₁A. The infectivity of progeny viruses in tomato infected with LuA-F was less than 4% of that with virulent ToMV. From these results, L₁₁A-F appears to possess the properties necessary for practical use. To manage L₁₁A-F strictly, a PCR-based assay to detect trace contamination of virulent ToMV in L₁₁A-F preparations was established. Received 10 June 2002/ Accepted in revised form 30 October 2002  相似文献