罗布麻属和白麻属种子形态特征及生活力的测定方法

以采自新疆维吾尔自治区阿勒泰市阿拉哈克镇境内的罗布麻属(Apocynum)和白麻属(Poacynum) 8个基因型植物的种子为材料,进行了8个基因型植物种子形态特征、千粒重和生活力测定方法探究。研究结果显示,参试罗布麻种子的长为2.75 mm,宽为0.68 mm,厚为0.49 mm。白麻属7个基因型中以紫斑中花的种子最长,为4.51 mm;青杆白花最宽,为0.90 mm;青杆白花和大叶白麻最厚,为0.61 mm。8个基因型种子的长、宽、高的变化范围分别为2.75～4.51、0.68～0.90和0.48～0.61 mm。其中,紫斑中花为最大基因型,罗布麻为最小基因型。千粒重变化范围在0.38～1.32 g,所有参试种子颜色均为褐色,其中以大叶白麻颜色最深。参试种子均表现出非休眠性种子萌发的特征,萌发时间较短,可以用来快速测定参试种子的生活力。采用四唑染色测定生活力时,参试种子均表现出不透四唑的特征,应该纵切切破种皮,预湿时间为12～14 h,染色时间为12 h,鉴定标准为种子胚80%完全染色。此次针对罗布麻属和白麻属种子形态特征与生活力测定方法的研究,能够为罗布麻种子生活力鉴定、大规模种...     

椰子果肉组织中总RNA的提取及质量分析

本研究以椰子(Cocos nucifera L.)果肉组织为材料,应用改良CTAB法对不同成熟度的椰肉组织总RNA进行提取分析.结果表明:改良CTAB法能有效去除椰肉组织中不同种类杂质的干扰,从两种不同成熟度的椰肉组织中获得了高质量的总RNA;应用琼脂糖凝胶电泳检测得到两条清晰的谱带,分别为28S和18S.通过紫外分光光度计检测含量和纯度显示:OD260/OD280值介于1.6～1.9之间,不同成熟度的椰肉组织提取的总RNA的浓度分别为0.070 μg/μL和0.053μg/μL.本研究使用的方法适用椰肉组织总RNA的提取,能够获得质量好、产率高、完整性强的总RNA,为进行椰子果实发育相关基因的克隆和分析奠定了一定的研究基础.     

聚L-乳酸改性麦草共混物材料的研究

以聚L-乳酸(PLLA)和麦草(WS)为原料,以N-甲基吗啉-N-氧化物(NMMO)为溶剂,采用溶液共混法制备了PLLA/WS共混物。首先将麦草溶解在NMMO后,再添加聚L-乳酸并溶解,制备聚L-乳酸与麦草的共混溶液。共混溶液采用浇膜法制备PLLA/WS共混物,采用差示扫描量热法、X射线衍射法、傅里叶变换红外光谱、热重分析和扫描电镜等方法对所得的共混物进行表征。结果表明,聚L-乳酸与麦草可以形成均匀的共混溶液。共混物中PLLA与麦草组分之间具有较强的相互作用,相容性较好。当共混物中PLLA的质量分数为50%时,共混物可以形成结晶结构,且随着PLLA含量的增加,其结晶更加完美,熔点与热稳定性提高。共混物薄膜断面结构较为致密,这说明PLLA与麦草相容性较好,混合均匀。通过调节聚L-乳酸和麦草的配比,可以制备不同性能的生物高分子材料。     

开阳县田坝渔业小区实施大鲵养殖的技术措施

为摸索名优水产品养殖经验,加快我县水产养殖结构调整,促进我县渔业健康发展,2007年,我县申报实施了《贵阳市社会主义新农村基础设施建设——养殖基地基础设施建设——渔业小区建设》项目,在花梨乡翁昭村田坝组模拟大鲵生态生活习性新建了100口养殖池的大鲵小区,修建了养殖房、管理房、配套饵料鱼池、饵料鱼暂养池、引水管道等基础设施和配套设施,并于2008年3月25日起引种入场养殖。现将1年来小区开展大鲵人工养殖的技术措施报告如下。     

Factors affecting the adoption of agroforestry practices by farmers in Cameroon

This paper presents empirical evidence on the impact of socio-economic factors on the adoption of agroforestry practices in Cameroon. The analysis uses primary farm-level data collected from June to December 1996. Three major provinces of the country were covered, namely Centre, Southwest and Northwest Several agroforestry technologies have been promoted among farmers in the zone, including alley farming, improved fallow, live fencing, cut-and-carry fodder and apiculture. The status of adoption of each agroforestry practice is described and factors that affect adoption identified. These are gender of farmer, household family size, level of education, farmer’s experience, membership within farmers’ associations, contact with research and extension, security of land tenure, agroecological zone, distance of the village from nearest town, village accessibility and income from livestock. Research findings indicate that since factors affecting farmers’ adoption of agroforestry practices differ across techniques, generalisation is to be avoided.     

泰国政府投巨资收储农产品

以三色竹芋的侧芽为外植体,研究了三色竹芋不定芽诱导、增殖和生根的组织培养过程,并研究了6-BA浓度和继代次数对叶片颜色的影响。结果表明：以三色竹芋的侧芽为外植体,经过芽的分化、增殖和生根可获得批量组培苗;降低6-BA的浓度,减少继代次数,有利于保持叶片的颜色。     

The protein,non-protein and total nitrogen inSolanum tuberosum,ssp.andigena potatoes

Total protein estimated from 80% ethanol insoluble nitrogen in residue ofS. tuberosum, ssp.andigena tubers agreed well with results obtained by Potty method and estimation of non-dialyzable nitrogen. The method is simple, rapid and applicable for screening large numbers of samples. Dry matter, total nitrogen, protein nitrogen and non-protein nitrogen were analyzed for 50 clone samples harvested in Huancayo, Peru, and correlations between the various constituents are statistically analyzed and discussed. An increase in total nitrogen with an increase of protein nitrogen was observed. Clones with higher dry matter normally showed lower % of non-protein nitrogen. The percentage of protein nitrogen to total nitrogen varied from 40 to 74% in the 50 clone samples and clonal differences in protein production were evident.     

数字乡村发展的实践与探索——基于北京的调研

研究旨在通过分析北京市数字乡村建设实践,发现存在问题,找出推进路径,为数字乡村发展提供可借鉴经验.利用文献分析、典型案例和专家咨询法,探讨数字乡村发展理论与实践.数字化是现代农业4.0阶段的关键特征,数字经济是农业农村高质量发展的新引擎、新动能.北京是数字乡村发展的先行者,为北京乡村振兴和农业现代化建设打下了坚实基础....