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云南省地方玉米种质资源的类型、品种及其子粒颜色多样性分析 总被引：1，自引：4，他引：1
对云南省地方玉米种质资源类型、品种(遗传)及子粒颜色的整理和分析,表明云南省玉米地方种质资源共有7个类型.类型多样,分布广泛,但不同类型的生态分布区和品种及其子粒色泽多样性存在较大差异.硬粒型品种及其子粒色泽多样性指数最大,品种数最多,占地方种质总数的58.2%;其次是半马齿型和糯质型品种,子粒颜色以黄、白色为主,分别占品种总数的43.3%和42.8%,其他颜色较少.糯质型品种主要集中分布于滇南和滇中两大生态区,存在不同的品种类型和丰富的种质资源,以及水平分布的区域性和立体分布的生态特点.硬粒型玉米品种的多样性与云南省的耕地成分、分布状况、人们种植和利用玉米的目的及用途密切相关.糯质玉米的丰富性、多样性和生态分布特点主要与云南省各民族人民的民族饮食文化密切相关。 相似文献
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冬季亚麻杂草种类危害及防除研究 总被引：1，自引：0，他引：1
本文调查研究了州内亚麻种植地区的田块杂草种类、分布和发生规律。查清杂草共有101种，隶属25科，发生危害重的有7科26种，占25．74％；双子叶杂草77种，占76．23％，单子叶杂草22种，占21．78％，蕨类杂草2种，占1．98％。一年生杂草42种，占42．58％，越年或一年生杂草29种，占28．7l％，多年生杂草30种，占29．7l％。杂草随亚麻的播种而生长，至枞形期达最高峰，88—1231株／m^2。防治上在亚麻枞形期（株高5—10cm）、杂草2—3叶期选择50％敌草隆＋5％精喹禾灵或50％敌草隆＋56％二甲四氯钠盐，兑水喷雾，防除效果达90％以上。 相似文献
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The main crop species (cereals, legume seeds and oilseeds) are reviewed with respect to their seed proteins. In the first section, a few points dealing with available analytical methods and nitrogen conversion factors are briefly discussed. The average crude protein contents of different cultivated species of grain are compared. The variability of seed protein content within a same species (phenotypic variations and biochemical mutations) is also discussed. The same kind of survey is then devoted to seed aminoacid composition in a second section. The analytical problems which are involved are summarized. The average aminoacid compositions of the main species are compared and the variations occurring within the same species are described, for the phenotypic ones as well as for some mutants. A last section concerns the relationships between aminoacid composition and protein content. The significance of these relations and their practical consequences are indicated. 相似文献
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马铃薯脱毒原原种高产低耗快繁技术研究 总被引：7，自引：0，他引：7
本文对马铃薯脱毒原原种快速繁育的一些关键技术措施进行了系统的研究, 即采用广口玻璃罐头瓶、简化培养基、液体浅层静置培养脱毒苗; 脱毒苗剪顶扦插快速育苗; 脱毒苗一次栽苗, 两次收种; 脱毒苗喷施多效唑等。这些技术是高产、高效、低耗、快繁脱毒原原种的有效方法, 可在规模化生产脱毒薯中应用。 相似文献
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概述我国热带地区牧草研究和发展现状，以及热区牧草推广应用存在的问题及改进方法，展望热带牧草的未来发展。 相似文献
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大豆基因组中的微卫星标记 总被引：5，自引：1，他引：4
微卫星ＤＮＡ是一种简单重复序列,其核心心单位由２０－５相核苷酸组成,两侧一般 序列。由于它具有共显性,多态性高,可进行ＰＣＲ扩增分析,既简单又经济,因此是一种很有价值的分子标记。实验证明大豆的微卫星ＤＮＡ随机分布于基因组中,其核心单位主要是（ＡＴ）ｎ,（ＡＴＴ）ｎ。在人类基因组很大比例铁（ＣＡ）ｎ则很少在大豆中出现。平均每一个微卫星座位有７－１０个等位基因,最高可达２６个。大豆的微卫星标记可扩充现 相似文献
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对天然橡胶现货和期货的销售过程、交易市场、交易所等进行比较,分析了我国天然橡胶现货和期货市场存在的问题并提出改进的方案,总结了国际天然橡胶定价中心成功因素。 相似文献
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玉米种质资源对大斑病的抗性鉴定 总被引：1，自引：1，他引：1
“八五”期间在昆明、成都、丹东等地对我国2538份玉米种质资源进行了大斑病抗性鉴定的结果；高抗材料2份，抗病材料12份，中抗材料127份，感病2397份。 相似文献
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Various methods of root sampling are reviewed and discussed in relation to the type of information required. The root sampling techniques at the Grassland Research Institute are described and examples of sampling errors are given. Details of a root washing machine are given. 相似文献
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樱桃番茄为小型多汁浆果,不仅品质好,糖度和维生素C 含量高于普通番茄,且富含矿质,是菜中佳肴尧果中美品。樱桃番茄具有喜温、喜光尧耐肥、半耐旱等生物学特性遥进行适时播种、培育壮苗、搞好田间管理是其丰产增收的关键。本文概述了樱桃番茄的营养特性、食用性、生物学特性,以及相应的栽培管理技术。 相似文献
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Nine chymotrypsin and four trypsin inhibitors have been extracted and separated from ungerminated oat grains. The inhibitors fell into two groups, based on their heat and pH stabilities. Members of the most abundant group are labile and are inactivated at 80 °C or at pHs of 3·3 or lower. Members of the second group are stable and are resistant to boiling for 30 min. On germination, the labile inhibitors are inactivated after 2 days and the stable chymotrypsin inhibitors after 3 days. Most of the labile inhibitors from ungerminated grain are destroyed when incubated at 20 °C for 20 h but addition of PMSF, a serine protease inhibitor, prevented their inactivation. Labile inhibitors in extracts of ungerminated oats are inactivated on incubation with an extract prepared from germinated oats, but not in the presence of PMSF. Most oat chymotrypsin and trypsin inhibitors are heat labile and pH sensitive. These inhibitors are apparently inactivated by serine proteinase(s) already present in ungerminated grain. 相似文献
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Marialuisa Menna Concetta Imperatore Filomena D’Aniello Anna Aiello 《Marine drugs》2013,11(5):1602-1643
Meroterpenes are widely distributed among marine organisms; they are particularly abundant within brown algae, but other important sources include microorganisms and invertebrates. In the present review the structures and bioactivities of meroterpenes from marine invertebrates, mainly sponges and tunicates, are summarized. More than 300 molecules, often complex and with unique skeletons originating from intra- and inter-molecular cyclizations, and/or rearrangements, are illustrated. The reported syntheses are mentioned. The issue of a potential microbial link to their biosynthesis is also shortly outlined. 相似文献
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This research studies the factors which influence the tensile strength of tire cords. Five yarn samples are made by changing
the spinning conditions and viscosity to get various physical properties. Different twisting methods are introduced and the
yarns are twisted under different processing conditions for each twisting process. With the experimental results, various
analyses are performed to find the important factors in retaining strength after the twisting process. SEM and optical microscopic
photographs are taken along with some measurements to assist the analysis. 相似文献
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《Journal of Cereal Science》2005,42(2):139-156
During seed germination several seed biopolymers, including the storage proteins, must be hydrolysed to provide biochemical building blocks for the growing seedling. This process is particularly important in barley because under the guise of ‘malting’, it forms the basis of the malting and brewing industries. The steps involved in the enzymatic formation of ‘soluble protein’ during malting and in the ‘mashing’ phase of brewing are still not well understood. The barley proteins are initially solubilized by endoproteases and then further degraded by exopeptidases. The cysteine-class proteases probably play the most important roles, but their contributions are likely not as overwhelming as was thought previously. The metalloproteases are apparently also important players in protein solubilization, although their contributions have scarcely been examined. The characteristics of the purified aspartic class proteases imply that they are not important contributors to protein solubilization, but recent mashing studies indicate that they probably do play a minor role. All indications are that the barley and malt serine class proteases are not directly involved in storage protein hydrolysis during malting/mashing. More studies are needed to clarify the roles of the aspartic- and metalloproteases. One important aspect of further studies should be to ensure that appropriate biochemical methods are used, as well as conditions that are truly appropriate to commercial malting and mashing processes. 相似文献