共查询到20条相似文献，搜索用时 765 毫秒
1.
高赖氨到基因导入玉米自交系的研究 总被引：2，自引：0，他引：2
通过对18个玉米自交系的组织培养，筛选到8个可以正常分化的自交系。用基因枪的方法对其中的4个自交系进行了遗传转化，将高赖氨酸基因导入玉米的胚性愈伤组织，以减少潮霉素筛选次数和筛选浓度的方法，得到分化再生植株，经分子检测，证明外源基因已成功整合到玉米基因组中。部分T0代植株正常结实，通过对T1代植株的分子检测，表明外源基因可以稳定遗传，对其中的转化植株所结的种子进行了赖氨酸含量的检测，发现赖氨酸含量最高提高了16％。 相似文献
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基因枪转化MAR序列介导水稻bar基因的表达分析 总被引：7，自引：0，他引：7
以水稻（Oryza sativa L.) 成熟胚愈伤组织作为水稻遗传转化受体，采用带有MAR（matrix attachment region)和不带MAR的两种植物表达质粒进行基因枪轰击转化bar基因，获得抗basta转基因水稻。分析了MAR序列介导在转基因水稻中对转基因表达的影响。研究结果表明，利用MAR序列介导bar基因表达，获得的转基因系的数量比对照提高66．7％，单块抗性愈伤组织再生植株数比对照提高27．3％，MAR序列介导bar基因表达的转基因系中，bar基因的表达水平比对照高，并且不同转基因系间bar基因表达差异比对照小。 相似文献
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玉米胚性愈伤组织转化及转Bt基因植株的抗虫性 总被引：17，自引：0，他引：17
用基因枪直接轰击玉米胚性愈伤组织，经潮霉素抗性选择平均每皿可得到０．７￣２．０块抗性愈伤组织，且大部分可再生植株。对这些从抗性愈伤组织分化的植株进行点杂交和Ｓｏｕｔｈｅｒｎ吸印杂交的结果也证明Ｂｔ基因已插入玉米染色组。对一个转Ｂｔ基因植株的测交后代进行了玉米暝抗性的田间鉴定，抗虫和感虫植株的比例接近１：１，符合孟德尔单显性基因的遗传规律。 相似文献
4.
经高赖氨酸基因导入玉米自交系的研究 总被引：22，自引：0，他引：22
通过对18个玉米自交系的组织培养,筛选到8个可以正常分化的自交系.用基因枪的方法对其中的4个自交系进行了遗传转化,将高赖氨酸基因导入玉米的胚性愈伤组织.以减少潮霉素筛选次数和筛选浓度的方法,得到分化再生植株.经分子检测,证明外源基因已成功整合到玉米基因组中.部分T0代植株正常结实,通过对T1代植株的分子检测,表明外源基因可以稳定遗传.对其中的转化植株所结的种子进行了赖氨酸含量的检测,发现赖氨酸含量最高提高了16%. 相似文献
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花生转化和再生研究进展 总被引：13，自引：0，他引：13
许泽永 《农业生物技术学报》2001,9(2):107-111
90年代以来,随着花生遗传转化和再生技术的进步，美国已分别获得抗病和抗虫转基因花生，取得突破性进展。目前，成功的农杆菌介导遗传转化以花生幼苗嫩叶、子叶为外植体，通过卡那霉素筛选，器官发生再生转化植株；基因枪介导的遗传转化是以胚愈伤为转化材料，通过潮霉素筛选转化体胚，再生转化植株。 相似文献
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将新的人工雄性不育基因导入小麦栽培品种的研究初报 总被引：25，自引：1，他引：24
利用ＰＤＳ－１０００型氢气基因枪将我们构建的雄性不育基因导入小麦栽培品种的幼胚愈伤组织,经含除草剂Ｂａｓｔａ的抗性培养基分化和生根筛选后得到２７株绿苗,ＰＣＲ和Ｓｏｕｒｈｔｅｍ检测均发现有３种株呈阳性,初步表明基因已整合到小麦的基因组中,转化频率达０．２％左右。 相似文献
8.
用基因枪将高赖氨酸基因导入玉米及转基因植株的检测 总被引：50，自引：3，他引：47
构建了两个含高赖氨酸蛋白质基因ｃＤＮＡ的表达载体,用基因枪法将其导入玉米不同杂交组合的胚性愈伤组织,经潮霉素抗性筛选,得到了可育的再生植株,经ＰＣＲ扩增分析。点杂交,及Ｓｏｕｔｈｅｍ杂交检测,表明该基因已整合到玉米的基因组中。测定１３株Ｔ１代种子中赖氨酸的含量,其中有３株赖氨酸含量提高１０％以上。 相似文献
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摘要：以生产上优良旱稻（Oryza sativa L. ）新品种旱稻297、旱稻10号等的幼胚愈伤组织为转化受体材料，用基因枪法把抗Basta除草剂的bar基因导入了这些品种的愈伤组织，经两轮Basta抗性筛选和分化获得了再生植株，对再生植株进行PCR扩增和Southern杂交检测，T0和T1代Basta抗性实验表明，bar基因已整合到旱稻的基因组DNA中，并在T1代继续表达。对各品种幼胚培养的诱导、分化培养基实验表明，MB和MS培养基可作为这5个品种的愈伤组织诱导培养基，改良的RMB2、RMS2培养基可显著地提高愈伤组织的分化频率。实验所获得的转基因植株和建立的遗传转化系统，为旱稻的抗除草剂分子育种和其它基因转化奠定了初步的基础。 相似文献
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抗除草剂基因导入早稻（Oryza sativa）栽培品种 总被引：2，自引：0，他引：2
以生产上优良旱稻(Oryza sativa L．)新品种旱稻297、旱稻10号等的幼胚愈伤组织为转化受体材料,用基因枪法把抗Basta除草剂的bar基因导入了这些品种的愈伤组织,经两轮Basta抗性筛选和分化获得了再生植株,对再生植株进行PCR扩增和Southern杂交检测,T0和T1代Basta抗性实验表明,bar基因已整合到旱稻的基因组DNA中,并在T1代继续表达。对各品种幼胚培养的诱导、分化培养基实验表明,MB和MS培养基可作为这5个品种的愈伤组织诱导培养基,改良的RMB2、RMS2培养基可显著地提高愈伤组织的分化频率。实验所获得的转基因植株和建立的遗传转化系统。为早稻的抗除草剂分子育种和其它基因转化奠定了初步的基础。 相似文献
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Suyundukov Ya. T. Suyundukova M. B. Bezuglova O. S. Khabirov I. K. Khasanova R. F. Semenova I. N. Rafikova Yu. S. Ilbulova G. R. 《Eurasian Soil Science》2022,55(1):27-35
Eurasian Soil Science - The results of the study of the properties of urban soils of the city of Sibay located in the mining region of the Republic of Bashkortostan are presented. A specific... 相似文献
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Kholodov V. A. Farkhodov Y. R. Yaroslavtseva N. V. Ziganshina A. R. Maksimovich S. V. 《Eurasian Soil Science》2022,55(7):998-1004
Eurasian Soil Science - Layers were step-by-step removed from macroaggregates (2–1 mm in diameter) of Protocalcic Chernozems via successive abrasion in a revolving rotator during 5, 10, 15,... 相似文献
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《Communications in Soil Science and Plant Analysis》2012,43(15-16):1631-1646
Abstract Brazil has approximately 30 million hectares of lowland areas, known locally as “Varzea,”; distributed throughout the country. Soils in these areas have the potential to support agricultural production, but very little is known about their fertility. The current experiment was undertaken to characterize the chemical and physical properties of representative “Varzea”; soils collected at 0–20, 20–40, 40–60, and 60–80 cm depth intervals from 23 sites in Goias State of Brazil. Organic matter contents averaged 42 g/kg in the surface 20 cm of soil and should make a significant contribution to overall nutrient availability. Soil pH increased slightly with depth from a mean value of 5.2 in the surface 20 cm of soil to a mean value of 5.4 in the 60–80 cm depth interval. Several soils had exchangeable Al values ≥ 1.0 cmol Al/kg, but soil Al saturation was generally less than the 60% level frequently associated with Al toxicity. However, cereal and legume production could benefit from lime addition in many of these soils. Although base saturation was fairly low in some soils, exchangeable Ca and Mg levels were, in general, adequate throughout the profile. Extractable P levels were adequate in most surface soil samples. Extractable K levels in these soils were generally low, and the application of K fertilizers should be beneficial, especially in conjunction with lime addition. The high clay content “Varzea”; soils of the Brazilian lowlands have some drainage problems but generally exhibit favorable chemical properties for crop production when compared to soils of the well‐drained Cerrados. 相似文献
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Ye. V. Rogozhina N. V. Kostina L. S. Malyukova 《Moscow University Soil Science Bulletin》2011,66(1):32-35
An estimation of potential nitrogen-fixing activity of various soil types under agrophytocenoses of tea, filbert, peach, and
pawpaw which grow in the area of Greater Sochi is given. High indicators of nitrogen fixation activity in the soil in the
course of vegetation were characteristic of agrocenoses of pawpaw, peach, and filbert. The lowest level of nitrogen fixation
was noted in the soil of a tea plantation. A negative correlation dependence of potential nitrogen-fixing activity on the
acidity of the soil solution was established. A study of the seasonal dynamics of the activity of nitrogen fixation of soils
of agrocenoses of the subtropical zone of Russia made it possible to distinguish a less active winter and more active spring-summer-autumn
periods. 相似文献
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The rate of popping of popcorn was measured in oil and in air. Kinetic data for lifetimes of individual kernels from a large population were obtained in oil at six constant temperatures (180–250°C) and also in an air‐popper at 202°C. The data are characterized by an induction period, which is, significantly, followed by a first‐order decrease in the number of unpopped kernels versus time. The activation energy for the first order process is 166.7 kJ/mol between 180 and 210°C, and 53.8 kJ/mol between 210 and 250°C. These data are consistent with a model that assumes 1) that the rate of heat transfer into a kernel follows Newton's law of cooling; 2) that in a sample of kernels there exists a distribution of critical pressures; 3) that for an individual kernel, the probability of popping is directly proportional to the difference between the internal aqueous vapor pressure and the kernel's critical pressure; and 4) that the measured rate constant at any temperature is an average overall of the kernels in the sample with critical pressures equal to or less than the internal aqueous vapor pressure. Minimum popping temperatures predicted by the model are 181 ± 2°C (oil) and 187 ± 2°C (air), in good agreement with previously reported direct measurements. 相似文献
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物联网是一个集信息通信、数据交换、传感器技术与软件工程于一体的综合性产业,探讨和分析了物联网的结构体系与发展中遇到的安全问题。 相似文献
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荔枝种子从果实中剥离出来后, 即使在室内条件下, 也极易失水干缩, 潮湿环境中又易发霉而腐烂。扫描电镜观察表明: 种皮上布满纹孔, 水分散失面积很大; 种脐部为疏松的海绵组织, 且营养丰富。据此, 生产上应对种子彻底清洗, 并保存于适当湿度的环境中, 以提高其发芽率。 相似文献