共查询到20条相似文献，搜索用时 62 毫秒
1.
本研究基于JGI数据库中香灰菌的同源序列设计兼并引物扩增基因保守区,随后通过FPNI-PCR分别扩增保守区两侧侧翼序列,得到基因全长。该基因全长1 845 bp,由四个外显子和三个内含子组成,编码区1 596 bp,编码531个氨基酸,其中前21个为信号肽。通过RedOxiBase数据库比对,认为该基因属于I型过氧化物酶中的Ascorbate-cytochrome c peroxidase (APx-CcP)亚家族,与炭团菌EC38和CO27-5亲缘关系最近,序列一致率达到77%～82.5%。通过大肠杆菌表达系统,成功在体外表达了As.APx-CcP重组蛋白,优化了表达条件,表达出大小为63 kD的重组蛋白,对超声后上清蛋白和复性后蛋白测量了抗坏血酸过氧化物酶(ascorbate peroxidase, APx)以及过氧化物酶(peroxidases, PODs)活性,均未显示出吸光度变化,即没有显示出APx和PODs活性。本研究成功克隆As.APx-CcP基因、初步探索了重组蛋白的酶学性质,从序列角度分析了蛋白失活的可能原因,为今后挖掘As.APx-CcP的功能,探究As.APx-C... 相似文献
2.
β-1,4-葡聚糖内切酶(endo-β-1,4-glucanase,EGase)在植物的组织生长、开花、果实成熟、器官脱落等方面都具有非常重要的作用。本研究克隆了一个新的水稻β-1,4-葡聚糖内切酶家族基因Os GLU16。序列分析表明该基因位于水稻第8号染色体,c DNA全长1 827 bp,包含一个1 572 bp的开放阅读框,编码523个氨基酸残基。蛋白质同源性分析表明,Os GLU16基因编码的蛋白在第54~第516个氨基酸残基区域具有高度保守的GH9催化结构域。本研究成功构建了Os GLU16基因过表达载体p Ca MV35S-Os GLU16-EGFP,并获得了转基因水稻植株。植株表型分析表明,与野生型相比,过表达株系表现为株高和穗长显著下降。本研究初步探明了Os GLU16基因过表达转基因水稻植株的表型特征,这为进一步丰富β-1,4-葡聚糖内切酶基因家族在水稻生长发育过程中的作用提供理论基础。 相似文献
3.
为了进一步研究FecB基因,利用PCR-RFLP技术筛选出FecB基因,PCR扩增FecB基因编码区序列1509bp,利用限制性内切酶BamHⅠ和EcoRⅠ定向插入原核表达载体pET30a(+),构建原核表达载体pET30a(+)-FecB,诱导表达纯化重组蛋白,免疫小鼠制备多克隆抗体,WesternBlot检测重组蛋白的免疫活性,ELISA检测抗体效价。结果表明,成功的构建了绵羊FecB基因的原核表达载体,并在大肠杆菌中表达目的蛋白,经过4次免疫后,获得多克隆抗体,ELISA方法检测小鼠抗体免疫效价达到1∶32000,纯化的蛋白具有免疫活性。为研究绵羊FecB基因蛋白的功能提供参考。 相似文献
4.
花青素还原酶(ANR)是催化花青素还原形成单体儿茶素的关键酶。油茶(Camellia oleifera Abel.)属于山茶科山茶属植物,其花青素还原酶基因尚未被克隆和功能分析。本研究采用RT-PCR技术,克隆获得了两条油茶花青素还原酶基因的全长序列,CoANR1基因全长1441bp,开放阅读框(ORF)长度为1047bp,编码348个氨基酸残基,与茶树ANR1基因的蛋白序列同源性为97%;CoANR2基因全长1413bp,ORF框长度为1014bp,编码337个氨基酸残基,与茶树ANR2基因的蛋白序列同源性为99%。采用大肠杆菌表达方法获得CoANR1和CoANR2重组蛋白,纯化蛋白经体外酶活检测能够催化矢车菊色素合成儿茶素(C)和表儿茶素(EC),催化飞燕草色素合成没食子儿茶素(GC)和没食子表儿茶素(EGC)。本研究为进一步研究油茶儿茶素合成的分子机制提供了重要的研究基础和理论依据。 相似文献
5.
水稻DUF966基因家族的生物信息学分析 总被引：1，自引：0，他引：1
《分子植物育种》2017,(12)
DUF966基因家族是一类未知功能的基因家族,它们在水稻生长发育和逆境胁迫应答反应中可能起重要作用,为了研究这些基因的生物学功能,初步揭示它们对水稻生长发育和抗逆性的调控作用,本研究通过生物信息学方法,分析了水稻DUF966家族基因特征、系统进化、芯片表达谱、跨膜结构域、信号肽以及亚细胞定位。结果表明,水稻DUF966基因家族包含7个成员,几乎都具有转录活性,它们编码的蛋白质只包含1~2个保守的未知功能结构域(DUF966结构域);进化分析表明,该家族可分为4个亚群,其中Os DSR2、Os DSR4、Os DSR5和Os DSR6同属一个亚群,可能具有相似的生物学功能;芯片表达谱分析表明,该家族基因主要在幼苗、花序和茎中呈中、低度表达,Os DSR3和Os DSR7基因受盐和低温胁迫的诱导表达,其它基因受不同非生物胁迫的抑制表达,该家族多数基因还能被白叶枯病菌侵染诱导表达;蛋白预测表明,该家族蛋白不含跨膜结构域和信号肽序列,能够被定位在细胞质中。本研究为系统开展水稻DUF966基因家族的生物学功能研究提供了依据。 相似文献
6.
鸡α干扰素基因的克隆、原核表达及抗病毒活性测定 总被引：6，自引：0，他引：6
通过PCR技术从罗曼鸡肝脏基因组中扩增鸡α干扰素(ChIFN-α)全基因,并克隆和测序.序列分析表明,ChIFN-α基因全长为582 bp,亚克隆其成熟蛋白编码基因489 bp,利用基因重组技术构建了重组质粒,使ChIFN-α置于原核表达载体pQE30的T5启动子下并同6×His(多聚组氨酸标签)-Tag 融合.经酶切和PCR鉴定,DNA测序证实重组质粒pQEChIFN-α构建正确;将pQEChIFN-α转化大肠杆菌M15感受态细胞,用IPTG诱导表达.SDS-PAGE和Western blot证实表达出分子质量为19.80 kDa的融合蛋白.表达的蛋白以包涵体形式存在,经变性、复性处理后,在Vero细胞上抗水泡性口炎病毒的活性为1.16×103 U/mg.本研究成功表达了ChIFN-α,表达的重组蛋白具有一定的生物活性. 相似文献
7.
植物油酸脱氢酶基因(FAD2)编码的蛋白是负责催化油酸转化为亚油酸的关键脂肪酸去饱和酶,在植物发育、油品质改良及耐逆过程中发挥重要调控作用。为了分离漆树FAD2基因并研究其功能,本研究采用同源克隆法首次从漆树中获得了FAD2基因的全长CDS序列。生物信息学分析结果表明,TvFAD2基因的开放阅读框为1 152 bp,编码383个氨基酸,具有典型的脂肪酸去饱和酶结构域。TvFAD2为亲水性蛋白,含有5个跨膜结构域和3个富含组氨酸的保守区域。系统进化树分析表明,漆树FAD2蛋白和盐肤木FAD2蛋白的亲缘关系最近。转录表达水平检测结果表明,TvFAD2基因在主要在漆树的叶和幼果中表达,在幼果中表达量最高,在花蕾期全花和盛花期全花中有低水平的表达。本研究为漆树FAD2基因的进一步利用提供了理论指导。 相似文献
8.
《分子植物育种》2021,19(7):2256-2264
F3'5'H是催化合成蓝色花色素的关键酶,F3'5'H蛋白序列中一段编码9个氨基酸的特殊序列区段可能与F3'5'H催化合成的蓝色花色素有关,但该特殊序列区段的催化功能和作用机制尚不清楚。为了探究PgF3'5'H中,该特殊序列结构的催化功能及作用机制,本研究通过重叠延伸PCR技术去除PgF3'5'H编码的9个氨基酸特殊序列区段,获得缺失突变型基因;将PgF3'5'H野生型及其突变型基因同时导入毕赤酵母;通过qRT-PCR检测野生基因及其突变基因在酵母中转录水平基因表达量的差异;通过SDS-PAGE检测PgF3'5'H野生型基因及其突变型基因在酵母中的合成蛋白量的差异。qRT-PCR分析结果显示PgF3'5'H野生型基因较其突变型在酵母中呈现更高的表达量;SDS-PAGE电泳结果显示重组子分泌生成了分子量大小约为52.0 k D的目标蛋白,且野生型蛋白量相比其突变型蛋白量高。因此,推测Pg F3'5'H蛋白序列中9个氨基酸的特殊序列与调控该基因在RNA和蛋白水平的表达量有关,进而可能影响该基因的催化功能。研究结果将为观赏植物蓝色花色形成分子机制及蓝色花色分子育种提供一定研究基础。 相似文献
9.
10.
巴西橡胶树HbUBC22基因克隆与表达分析 总被引：1，自引：1，他引：0
泛素蛋白酶体途径（ubiquitin proteasome pathway, UPP）是细胞内最重要的且具有高度选择性的蛋白质降解途径,而泛素结合酶E2/UBC是该途径的一个关键酶。本研究通过对巴西橡胶树同源EST序列拼接和RT-PCR扩增的方法,克隆了一个巴西橡胶树的泛素结合酶基因HbUBC22,该基因的开放阅读框（ORF）共807 bp,编码268个氨基酸,编码蛋白含有一个保守的UBC结构域和一个高度保守的半胱氨酸催化位点。系统进化关系分析发现,HbUBC22蛋白与蓖麻、杨树、油茶和葡萄的UBC蛋白的同源性最高,分别为89%、85%、85%和81%;在拟南芥基因组中,HbUBC22则与AtUBC22的同源性最高达到73%。表达谱分析结果显示,HbUBC22受乙烯利和茉莉酸甲酯诱导显著上调表达。原核表达分析结果表明,经IPTG诱导后,HbUBC22能够在大肠杆菌中表达出目标蛋白。本研究结果为进一步研究HbUBC22在橡胶树中的生物学功能奠定了良好基础。 相似文献
11.
Biological Activity and Quantification of Suspected Allelochemicals from Alfalfa Plant Parts 总被引：7，自引：0，他引：7
Autotoxicity restricts reseeding of alfalfa (Medicago sativa L.) after alfalfa until autotoxic chemical(s) breaks down or is dispersed into external environments. A series of aqueous extracts from leaves, stems, roots and seeds of alfalfa ‘Vernal’ were bioassayed against alfalfa seedlings of the same cultivar to determine their autotoxicity. The highest inhibition was found in the extracts from the leaves. Extracts at 40 g dry tissue l?1 from alfalfa leaves were 15.4, 17.5 and 28.7 times more toxic to alfalfa root growth than were those from roots, stems and seeds, respectively. A high‐performance liquid chromatography (HPLC) analysis with nine standard compounds showed that the concentrations and compositions of allelopathic compounds depended on the plant parts. In leaf extracts that showed the most inhibitory effect on root growth, the highest amounts of allelochemicals were detected. Among nine phenolic compounds assayed for their phytotoxicity on root growth of alfalfa, coumarin, trans‐cinnamic acid and o‐coumaric acid at 10?3 m were most inhibitory. The type and amount of causative allelochemicals found in alfalfa plant parts were highly correlated with the results of the bioassay, indicating that the autotoxic effects of alfalfa plant parts significantly differed. 相似文献
12.
C. J. Spurr D. A. Fulton P. H. Brown R. J. Clark 《Journal of Agronomy and Crop Science》2002,188(4):275-280
Development of onion (Allium cepa L., cv. ‘Early Cream Gold’) seed under cool climate conditions in Tasmania, Australia occurred over a longer duration than previously reported, but similar patterns of change in yield components were recorded. In contrast to previous studies, umbel moisture content declined from 85 to 67 % over 57 days while seed moisture content decreased from 85 to 31 %. Seed yield continued to increase over the duration of crop development, with increasing seed weight compensating for seed loss resulting from capsule dehiscence in the later stages of maturation. Germination percentage was high and did not vary significantly from 53 to 77 days after full bloom (DAF), but mean germination time declined and uniformity of germination increased significantly over the same time period. The percentage abnormal seedlings declined with later harvest date, resulting in highest seed quality at 77 DAF. The results of this study suggest that the decision to harvest cool climate onion seed crops before capsule dehiscence will result in a loss of potential seed yield and quality. 相似文献
13.
G. H. Kroon 《Euphytica》1994,76(1-2):125-125
Summary
K x vadensis is a hybrid of K. blossfeldiana and K. marmorata obtained after doubling the number of chromosomes. 相似文献
14.
Jens Jensen 《Euphytica》1979,28(1):47-56
Summary The high-lysine gene in Risø mutant 1508 conditions an increased lysine content in the endosperm via a changed protein composition, a decreased seed size, and several other characters of the seed. The designation lys3a, lys3b, and lys3c, is proposed for the allelic high-lysine genes in three Risø mutants, nos 1508, 18, and 19. Linkage studies with translocations locate the lys3 locus in the centromere region of chromosome 7. A linkage study involving the loci lys3 and ddt (resistance to DDT) together with the marker loci fs (fragile stem), s (short rachilla hairs), and r (smooth awn) show that the order of the five loci on chromosome 7 from the long to the short chromosome arm is r, s, fs, lys3, ddt. The distance from locus r to locus ddt is about 100 centimorgans. 相似文献
15.
Hongyan WEI Jian ZHOU Jinguang LU Jingzheng SONG Qiongxi YU Zhihong JIANG 《Medicinal Plant》2019,(6):27-29
[Objectives]This study aimed to establish a QAMS(quantitative analysis of multi-components by single-marker)method for simultaneous determination of four phenol... 相似文献
16.
Summary Avoidance of rust fungi that was based on poor appressorium induction was previously found in Hordeum chilense. In the present study 95 accessions of Triticeae were screened for avoidance of Puccinia hordei. The percentage of appressorium formation per germinated spore ranged from 6 to 90%. On none of the 41 accessions of Aegilops, Agropyron, Elymus, Secale, Thinopyrum or Triticum studied was the rate of appressorium formation lower than 25%. Lower rates of appressorium formation were, however, found on accessions of wild barley species Hordeum brachyantherum, H. marinum, H. parodii and H. secalinum. Its implications in cereal breeding are discussed. 相似文献
17.
Summary Reactions of 13 grasses to Meloidogyne naasi varied with species; ryegrasses, fescues and their hybrids were generally susceptible and cocksfoot and timothy resistant. Marked variation in host resistance levels occurred between genotypes within cultivars.Selection of single plants, followed by tests on replicate tillers, identified resistant and susceptible genotypes in both Italian and perennial ryegrass cultivars. Resistant plants had few nematode-induced galls and fewer females and eggs than susceptibles. There was more or less continuous variation, with many genotypes intermediate between extremes of resistance and susceptibility. Selected resistant and susceptible genotypes are of use in assessing variation in nematode populations and as controls for breeding and selection programmes. 相似文献
18.
W. Erskine M. Tufail A. Russell M. C. Tyagi M. M. Rahman M. C. Saxena 《Euphytica》1993,73(1-2):127-135
Lentil production is limited by lack of moisture and unfavorable temperatures throughout its distribution. Waterlogging and salinity are only locally important. Progress has been made in breeding for tolerance to drought through selection for an appropriate phenology and increased water use efficiency and in breeding for winter hardiness through selection for cold tolerance.The diseases rust, vascular wilt, and Ascochyta blight, caused by Uromyces viciae-fabae, Fusarium oxysporum f. sp. lentis, and Ascochyta fabae f. sp. lentis, respectively, are the key fungal pathogens of lentil. Cultivars with resistance to rust and Ascochyta blight have been released in several countries and resistant sources to vascular wilt are being exploited. Sources of resistance to several other fungal and viral diseases of regional importance are known. In contrast, although the pea leaf weevil (Sitona spp.) and the parasitic weed broomrape (Orobanche spp.), and to a lesser extent the cyst nematode (Heterodera ciceri), are significant yield reducers of lentil, no sources of resistance to these biotic stresses have been found. Directions for future research in lentil on both biotic and abiotic stresses are discussed. 相似文献
19.
D. A. Bond G. J. Jellis G. G. Rowland J. Le Guen L. D. Robertson S. A. Khalil L. Li-Juan 《Euphytica》1993,73(1-2):151-166
Progress is being made, mainly by ICARDA but also elsewhere, in breeding for resistance to Botrytis, AScochyta, Uromyces, and Orobanche; and some lines have resistance to more than one pathogen. The strategy is to extend multiple resistance but also to seek new and durable forms of resistance. Internationally coordinated programs are needed to maintain the momentum of this work.Tolerance of abiotic stresses leads to types suited to dry or cold environments rather than broad adaptability, but in this cross-pollinated species, the more hybrid vigor expressed by a cultivar, the more it is likely to tolerate various stresses. 相似文献
20.
Chunli TANG Fengxian ZHAO Hongxia CHEN Jiabao MA Jiangcun WEI Meiyan QIU Zhen XIE 《Medicinal Plant》2019,(6):60-65
[Objectives]To optimize the water extraction process of Chinese Herbal Compound Man Gan Ning and establish a method for its extraction and content determination... 相似文献