共查询到20条相似文献,搜索用时 46 毫秒
1.
植物抗虫基因工程为防治农业害虫提供了一条崭新途径。本文对植物抗虫基因工程近年来所取得的某些研究进展,包括目前已发现和利用的抗虫基因、提高抗虫基因在植物体内表达的方法以及防止或延缓害虫产生抗性的策略等方面进行了综合评述,并对植物抗虫基因工程中有待解决的问题和发展前景提出了自己的看法。 相似文献
2.
3.
植物抗虫基因工程研究进展 总被引:21,自引:0,他引:21
植物抗虫基因工程为防治农业害虫提供了一条崭新途径。本文对植物抗虫基因工程近年来所取得的某些研究进展,包括目前已发现和利用的抗虫基因、提高抗虫基因在植物体内表达的方法以及防止或延缓害虫产生抗性的策略等方面进行了综合评述,并对植物抗虫基因工程中有待解决的问题和发展前提提出了自己的看法。 相似文献
4.
植物来源抗虫基因的研究进展 总被引:3,自引:0,他引:3
植物抗虫基因工程为农林业生产中的害虫防治提供了新的途径,随着研究的不断深入,已经获得了很多抗虫基因。本文综述了目前源于植物的抗虫基因的种类,归纳了研究较多的抗虫基因的作用机制及其在转基因植物中的应用,提出了植物抗虫基因在虫害防治中面临的问题及相应的解决策略,展望了植物抗虫基因工程研究发展的方向和前景。 相似文献
5.
6.
抗虫转基因植物的研究进展及前景 总被引:45,自引:0,他引:45
虫害对农业生产的危害日益严重。目前对害虫的防治主要依赖于化学药物,但化学药物的副作用不容忽视。利用植物基因工程获得抗虫转基因植物是更具前景的途径。目前主要利用的抗虫基因是苏云金杆菌的δ-内毒素基因和植物来源的抗虫基因(如蛋白酶抑制剂基因、淀粉酶抑制剂基因、凝集素基因等),各种抗虫基因在转基因应用中各有其优缺点,如苏云金杆菌δ-内毒素基因是植物中表达水平低。随着抗虫转基因植物在大田中的应用,昆虫的抗 相似文献
7.
用合成的crylAc基因与绿色荧光蛋白基因(GFP)构成融合蛋白基因,然后和改造的GNA基因构建双价抗虫基因植物表达载体pBGbfg,经根癌农杆菌介导转化了烟草。在紫外灯照射下,观察到转基因植株叶片中有较强的绿色荧光;经抗虫试验、PCR、Southern blot和Western blot等检测,表明该重组植物表达载体能够在转基因植物中有效表达外源基因,转基因植株绿色荧光的表型与其抗虫性密切相关。从而成功地建立了以绿色荧光蛋白基因与抗虫基因组成的融合基因转化系统,简化了抗虫转基因植物筛选程序,有助于快速获得双价抗虫转基因植株。 相似文献
8.
9.
水稻抗虫基因工程研究进展 总被引:6,自引:0,他引:6
近年来,随着植物基因工程的发展,水稻抗虫转化研究工作进展迅速,一批极具应用潜力的抗虫品系初露端倪。综述了目前国内外水稻抗虫基因工程取得的进展。结合植物抗虫基因工程的研究成果,对目前水稻抗虫基因工程中存在的一些问题提出了相关的对策,其中主要讨论提高外源基因表达效率的途径。 相似文献
10.
转双抗虫基因杂种741毛白杨的研究 总被引:35,自引:0,他引:35
用部分改造后的苏云金芽孢杆菌 (Bt)杀虫蛋白基因和慈菇蛋白酶抑制剂 (API)基因A构建了植物表达载体。然后通过根癌土壤杆菌 (Agrobacteriumtumefaciens (SmithetTownsend)Conn .)介导将此表达载体上的双抗虫基因转入杂种 741毛白杨 [PopulusalbaL .× (P .davidianaDode P .simoniiCarr.)×P .tomentosaCarr.]获得了一批抗卡那霉素的转化再生植株。用杨扇舟蛾 (Closteraanachoreta (Fabricius) )进行虫试的结果表明有 3株抗虫杨树 ,其中有1株杨树的叶片可使试虫在 6天内的死亡率达 90 %以上 ,而且存活幼虫的生长发育受到了明显的抑制。PCR检测及基因组DNASouthern杂交分析的结果都表明Bt杀虫蛋白基因和API基因已整合到以上 3株抗虫杨树的基因组中 ,而且表现为单拷贝整合。用Bt毒蛋白抗血清进行滤膜免疫反应及ELISA检测结果表明 3株转基因杨树都有Bt杀虫蛋白的表达 ,表达量约占叶总可溶性蛋白的 0 .0 15 %。这是国内外首次报道用双抗虫基因获得的抗虫 741毛白杨植株。 相似文献
11.
12.
13.
14.
Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis
It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis. 相似文献
15.
16.
RICHARD E. NORRIS 《Botanical journal of the Linnean Society. Linnean Society of London》1991,106(1):1-40
Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera. 相似文献
17.
JOAN VALUÈS MONTSERRAT TORRELL NÚRIA GARCIA JACAS 《Botanical journal of the Linnean Society. Linnean Society of London》2001,137(4):399-407
Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted. 相似文献
18.
肝癌中HBV和HCV基因和抗原的分布及意义 总被引:1,自引:0,他引:1
采用原位分子杂交方法检测HCV
RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV
RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV
RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV
X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV
C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细 相似文献
19.
20.
H.-R. GREGORIUS 《Biological journal of the Linnean Society. Linnean Society of London》1984,23(2-3):157-165
For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment. 相似文献
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment. 相似文献