不同生长调节剂对丹参快速繁殖的影响

探讨了丹参(Salvia miltiorrhiza Bunge)快速繁殖过程中不同生长调节剂的影响.实验表明:MS 6-BA 2.0mg/L NAA 0.05 mg/L是诱导初代培养的芽产生大量丛生芽的最佳培养基,其诱导生芽率为100%;最佳的丛生芽增殖培养基为MS 6-BA 1.0 mg/L NAA 0.01 mg/L,其增殖倍数为15倍;MS 6-BA 0.5～2.0 mg/L是诱导大量不定芽的最佳培养基,其诱导生芽率为100%,最佳的不定芽增殖培养基为MS 6-BA 1.0 mg/L,其增殖倍数为24倍;诱导生根较好的培养基为1/2MS IBA 0.1 mg/L,生根率为98%,移栽成活率为100%.     

蝴蝶兰丛生芽、原球茎途径的组织培养研究

对蝴蝶兰丛生芽、原球茎途径的组织培养进行研究,结果表明,不经过愈伤组织直接诱导丛生芽的过程中,1/2MS 6-BA6.0mg/L和1/2MS 6-BA3.0mg/L NAA0.2mg/L两种培养基的诱导率可达100%,丛生芽增殖阶段采用1/2MS 6-BA5.0mg/L NAA 0.5mg/L效果最好;原球茎途径中,1/2MS 6-BA15.0mg,L NAA1.0mg/L诱导率达20.0%,接入1/2MS 6-BA3.0mg/L NAA0.5mg/L培养基中,增殖倍数达7.4,随后转入1/2MS 6-BA1.0mg/L NAA0.5mg/L中,可很快分化成芽.生根培养基以1/2MS IBA0.3mg/L较好,将生根的蝴蝶兰移栽至水苔中,两个月后成活率达100%.此外,蝴蝶兰移栽6个月后转至水培更有利于生长.     

抗茎枯病芦笋品种离体培养的研究北大核心CSCD

选用芦笋(Asparagus officinalis)茎枯病高抗品种格兰蒂为材料,研究各种生长素及细胞分裂素对其茎尖诱导的愈伤组织、不定芽增殖和生根的效果。实验结果表明,最适芦笋茎尖诱导愈伤组织的培养基为:MS+6-BA0.3 mg/L+2,4-D 1.5 mg/L+蔗糖25 g/L+琼脂7 g/L,pH 5.8;最适愈伤组织增殖诱导、分化不定芽的培养基为:MS+NAA 0.3 mg/L+6-BA 0.5 mg/L+蔗糖30 g/L+琼脂7 g/L,pH 5.8;最适生根培养基为:1/2 MS+0.5 mg/L IBA+1 mg/L PP333+0.3 mg/L 6-BA+蔗糖30 g/L+琼脂7 g/L,pH 5.8。     

墨兰的无菌播种和植株再生

墨兰的无菌播种结果发现,在不添加细胞分裂素的培养基上,种子可以发芽,但只有原球茎和根状茎产生;不可能进一步分化成苗,只有在含有不同激素成分的MS或KnudsonC培养基上,才有可能诱导芽的分化,其中以附加6-BA 0.5-1.0mg/L+NAA 0.1mg/L诱导效果最佳,在附加6-BA 2.0mg/L+NAA 0.4mg/L的MS培养基中,能加速芽的增殖,根状茎转入含有相同激素成分的液体增殖培养基中振荡培养,可大大提高芽的分化速率。添加0.5%活性炭对芽的分化有明显增效作用。在附加NAA 0.2mg/L的MS培养基中;幼苗的生根效果最佳。     

丹参离体微繁技术研究

以丹参(Salvia miltiorrhiza Bunge)离体幼茎、叶、叶柄为外植体,对其丛生芽、不定芽的诱导和增殖、生根、移栽等方面进行系统研究,探讨了有关丹参的离体快速微繁技术。试验表明：MS 6-BA1．0mg／L是诱导初代培养的芽产生丛生芽的最佳培养基,其诱导生芽率为100％,丛生芽增殖的最佳培养基为MS 6-BA1．0mg／L NAA0．01mg／L;以叶为外植体,用MS 6-BA 0．5～2．0mg／L诱导不定芽可取得较好效果,其诱导生芽率为100％,不定芽增殖的最佳培养基为MS 6-BA1．0mg／L,其增殖倍数达24倍;诱导生根较好的培养基为1／2MS 0．1mg／L IBA,移栽先水培再土培,成活率可达100％。     

抗茎枯病芦笋品种离体培养的研究

选用芦笋（Asparagus officinalis）茎枯病高抗品种格兰蒂为材料,研究各种生长素及细胞分裂素对其茎尖诱导的愈伤组织、不定芽增殖和生根的效果。实验结果表明,最适芦笋茎尖诱导愈伤组织的培养基为：MS＋6-BA0.3 mg/L＋2,4-D 1.5 mg/L＋蔗糖25 g/L＋琼脂7 g/L,pH 5.8;最适愈伤组织增殖诱导、分化不定芽的培养基为：MS＋NAA 0.3 mg/L＋6-BA 0.5 mg/L＋蔗糖30 g/L＋琼脂7 g/L,pH 5.8;最适生根培养基为：1/2 MS＋0.5 mg/L IBA＋1 mg/L PP333＋0.3 mg/L 6-BA＋蔗糖30 g/L＋琼脂7 g/L,pH 5.8。     

黄百合组织培养与快速繁殖(简报)

以黄百合鳞茎为外植体,在 MS 6-BA 3.0mg/L NAA 0.2mg/L培养基上诱导产生不定芽效果最好;MS 6-BA 2.0mg/L NAA 0.1mg/L 是黄百合增殖的最佳培养基;在 MS NAA 0.2mg/L 生根培养基中可正常发根,且根系粗壮。     

彩色大白菜子叶的不定芽再生

以彩色大白菜子叶为外植体,研究不同激素配比和AgNO3对不定芽再生的影响。结果表明:单独附加细胞分裂素(6-BA或TDZ)的MS培养基,不能诱导子叶不定芽分化;而同时附加生长素(NAA)和细胞分裂素(6-BA或TDZ),不定芽的再生频率提高,最高为15%;AgNO3与细胞分裂素及生长素配合使用,能大幅度提高子叶不定芽的再生频率,提高率最高达42.5%。与6-BA相比,TDZ对不定芽再生的效果更好。当TDZ浓度为0.05mg/L、NAA为0.3mg/L、AgNO3为8mg/L时,产生丛状芽数目最多,再生率最高,达50%。     

甘肃瑞香组织培养技术研究

以野生甘肃瑞香顶芽为外植体进行组织培养实验研究。结果表明:甘肃瑞香愈伤组织诱导的培养基为MS+2,4-D3.0 mg/L+6-BA3.0 mg/L;愈伤分化培养基为MS+ZT2.0 mg/L+NAA0.5 mg/L;不定芽增殖培养基为MS+6-BA1.0 mg/L+NAA0.2 mg/L,平均增殖倍数为7.8;生根培养基为1/2MS+NAA0.5 mg/L,生根数平均为3条左右,生根率为85%以上。     

金线莲外植体筛选及愈伤组织诱导研究

以金线莲茎段、叶片、茎片、不定芽为试材,分别在添加6-BA、ZT、NAA、KT 5个不同处理的MS及1/2MS培养基上培养,诱导愈伤组织。结果表明,以茎段、茎片、不定芽为外植体,在MS + 6-BA 2.0 mg/L + NAA0.5 mg/L、MS + NAA 2.0 mg/L + KT 0.1 mg/L和MS + 6-BA 2.0 mg/L + NAA 0.5 mg/L + ZT 0.2 mg/L培养基中培养,均能成功诱导愈伤组织。不定芽为诱导愈伤组织最佳外植体,最佳培养基为MS + 6-BA 2.0 mg/L + NAA 0.5 mg/L + KT 0.2 mg/L。     

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.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

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.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

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.     

肝癌中HBV和HCV基因和抗原的分布及意义

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     

Selection with two alleles and complete dominance

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.