共查询到20条相似文献，搜索用时 62 毫秒
1.
《分子植物育种》2017,(5)
本研究采用L_(16)(4~5)正交试验设计方法,对朱顶红SRAP-PCR反应体系中的5种因素(Mg~(2+)浓度,d NTPs浓度,引物浓度,DNA模板量和Taq DNA聚合酶用量)进行优化,结果表明各因素对朱顶红SRAP-PCR扩增反应影响大小依次为:d NTPs浓度引物浓度Mg~(2+)浓度DNA模板量Taq DNA聚合酶用量。优化获得的朱顶红最佳SRAP-PCR反应体系为:1×PCR Buffer、Mg~(2+)浓度2.0 mmol/L、d NTPs浓度0.2 mmol/L、引物浓度0.25μmol/L、20μL体系中DNA模板量80 ng以及Taq DNA聚合酶用量0.5 U。用10个朱顶红品种基因组DNA对所得最优体系进行验证,证明该体系具有较高的稳定性和重复性,能够为朱顶红遗传多样性研究和遗传图谱构建等提供重要技术支持。 相似文献
2.
《分子植物育种》2021,19(7):2279-2285
本研究采用改良的CTAB法提取元宝枫基因组DNA,并使用L_(16)(4~5)正交试验设计。通过5因素4水平实验,筛选Taq DNA聚合酶、dNTPs、引物浓度、Mg~(2+)、模板DNA浓度及其用量,建立并优化元宝枫(Acer truncatum)的最佳SSR-PCR反应体系,即总体积20μL,Taq DNA聚合酶、dNTPs、引物、Mg~(2+)和模板DNA浓度分别为1 U/20μL、0.2 mmol/L、0.6 mmol/L、1.25 mmol/L和75 ng/20μL。扩增实验结果表明,该反应体系稳定性较好,可重复性高,具有较好的分辨率。可从59对引物中筛选出14对适用于元宝枫并具有较明显的多态性的SSR引物,为进一步研究元宝枫的分子标记辅助育种、SSR遗传多样性分析和遗传图谱构建提供了良好的基础。 相似文献
3.
《分子植物育种》2020,(12)
为建立郁金香SSR-PCR反应体系,本研究以36个荷兰引进的郁金香栽培品种和5个产于中国新疆的野生种为试验材料,采用单因素试验和L_(16)(4~5)正交设计相结合的方法,对影响郁金香SSR-PCR反应的Mg~(2+)浓度、dNTPs浓度、引物浓度、模板DNA、Taq酶用量进行优化,建立最佳的SSR-PCR反应体系,并利用3对引物在41份郁金香材料中验证反应体系的稳定性。结果表明:在20μL的PCR反应体系中,10×PCR Buffer (Mg~(2+)free) 2μL、Mg~(2+)2.0 mmol/L、dNTPs 0.75 mmol/L、引物2.0μmol/L、模板DNA 10 ng、Taq酶0.15 U为最优体系;通过正交试验确定5个因子对SSR-PCR体系的影响程度为:模板DNATaq酶引物Mg~(2+)d NTPs。筛选出的3对引物在41份郁金香材料中均可扩增出目的条带,表明该体系的稳定性好。本研究建立SSR-PCR反应体系,为郁金香SSR标记的开发以及遗传多样性分析、品种指纹图谱构建、种质资源鉴定等方面提供了帮助。 相似文献
4.
食用向日葵SSR-PCR反应体系的优化 总被引：1，自引：0，他引：1
为建立食用向日葵分子标记反应体系,以食用向日葵四叶期叶片为DNA模板提取材料,采用单因素试验和正交试验设计,对SSR-PCR反应体系中的6因素(10×PCR Buffer、Mg2+、d NTPs、引物、Taq DNA聚合酶和DNA模板)在5水平上进行正交优化试验,并比较了不同浓度Mg2+、Taq DNA聚合酶、模板DNA对扩增效果的影响,结果表明,各因素水平变化对反应体系的影响为Mg2+Taq DNA聚合酶(引物)DNA模板10×PCR Bufferd NTPs。最终建立食用向日葵SSR-PCR最佳反应体系为:在总体系为20μL的SSR-PCR反应体系中包括10×PCR Buffer 0.2mmol/L、Mg2+2.0 mmol/L、d NTPs 1.8 mmol/L、Taq DNA聚合酶0.2 U、DNA 50 ng、引物1.5 mmol/L。 相似文献
5.
为了更好地应用SSR分子标记技术于濒危植物海南龙血树保护遗传学研究,本研究通过单因子试验与正交试验方法,优化建立海南龙血树SSR-PCR反应体系,并对优化后体系的稳定性进行了检测。研究结果表明,优化后的海南龙血树15μL SSR-PCR反应体系为:1.5μL 10×PCR buffer, Mg~(2+)浓度为2.0 mmol/L,d NTPs浓度为100μmol/L,Taq酶1.0 U,引物0.4μmol/L和DNA模板5 ng。经验证,该反应条件可用于海南龙血树遗传多样性和遗传结构分析。 相似文献
6.
为了进一步开发利用番茄种质资源和开展分子标记辅助选择育种,本研究利用高通量组织研磨机研磨微量叶片,通过改良CTAB法快速提取DNA,并利用L16(45)正交设计试验,综合采用直观量化分析和方差分析两种方法,分析Mg2+、d NTPs、Taq DNA聚合酶、引物、模板DNA浓度5个因素对番茄SSR-PCR扩增的影响,比较不同处理组合扩增效果的差异,最终筛选与验证最优的番茄SSR-PCR反应体系,并在此体系下对SSR引物进行筛选。结果表明番茄SSR-PCR最佳反应体系(20μL)为Mg2+3.0 mmol/L、d NTPs 0.4 mmol/L、Taq DNA聚合酶0.5 U、引物0.5μmol/L、模板DNA 40 ng;且利用优化后的反应体系,从540对SSR引物中筛选出373对(占69.07%)扩增条带清晰、多态性丰富的引物。该SSR-PCR体系的建立为番茄种质资源遗传多样性分析,品种鉴定及指纹图谱构建等研究提供了一个标准化的程序。 相似文献
7.
绣球SSR-PCR反应体系的建立与优化 总被引：1，自引：0，他引：1
为了建立适合绣球的SSR-PCR反应体系,采用正交设计L25(56)对影响SSR-PCR反应体系的5个主要因素(Mg2+、d NTPs、引物、DNA模板和Taq聚合酶)在5个水平上进行优化,筛选出每个因素的最佳水平,建立适合绣球的SSR-PCR反应体系。结果表明,20μL的SSR-PCR反应体系中,DNA模板用量为60 ng,Mg2+浓度为1.5 mmol/L,d NTPs浓度为0.3 mmol/L,引物浓度为0.4μmol/L,Taq聚合酶用量为0.8 U。扩增程序为:94℃预变性5 min;94℃变性1 min,最佳温度退火40 s,72℃1 min,33个循环;72℃延伸10 min,4℃保存。选用10个绣球品种对建立的SSR-PCR反应体系进行验证,结果表明该体系具有较好的稳定性和通用性。建立和优化的绣球SSR-PCR反应体系,为应用SSR分子标记技术开展绣球属植物遗传育种研究提供了理论依据和技术参考。 相似文献
8.
《分子植物育种》2017,(6)
本研究利用L16(45)正交试验设计,对影响ISSR-PCR反应体系的5个影响因素(Mg~(2+)浓度,d NTPs浓度,Taq DNA聚合酶浓度,引物浓度及模板DNA含量)进行优化。并在50~60℃范围内摸索引物UBC845的最适退火温度,并建立了花吊丝竹的最佳ISSR-PCR反应体系:2.5 mmol/L Mg~(2+),0.25 mmol/L d NTPs,1.50 U Taq DNA聚合酶,0.5μmol/L引物,80 ng模板DNA,2μL 10x Buffer,9.5μL dd H2O,ISSR-PCR扩增程序为:94℃预变性5 min;94℃变性45 s;52.7℃退火30 s,72℃延伸90 s,35个循环;72℃延伸10 min,4℃保存。利用优化的反应体系从100条引物中筛选出16条多态性较好的引物,该体系的建立有助于花吊丝竹种质资源遗传多样性分析和指纹图谱的构建。 相似文献
9.
10.
本研究采用L16(45)正交试验设计法对山羽藓ISSR-PCR反应进行优化试验。研究结果表明,山羽藓ISSR-PCR最佳反应体系(25μL)为:Taq DNA聚合酶0.8 U,Mg2+1.5 mmol/L,d NTPs 0.4 mmol/L,引物0.6μmol/L和模板DNA 40 ng,对该反应体系的影响顺序为:Taq DNA聚合酶引物d NTPs模板DNAMg2+。同时筛选出12条适合山羽藓的ISSR引物,并确定了每条引物的最适退火温度。所建立的体系稳定可靠,条带清晰且多态性丰富,可为后续开展山羽藓种植资源、遗传多样性及分子亲缘地理学研究奠定基础。 相似文献
11.
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
12.
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
13.
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
14.
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
15.
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
16.
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
17.
Summary Apple and pear pollen was irradiated with doses of 0, 50, 100, 250 and 500 krad (gamma rays) and stored at 4°C and 0–10% r.h. From the in-vitro germination percentages an average LD 50 dose of about 220 krad was estimated. For both irradiated and untreated pollen a close and corresponding lineair relationship existed between germination percentage and pollen tube growth.Irradiated pollen was much more sensitive to dry storage conditions than untreated pollen, resulting in less germination and more bursting. Apparently, irradiation caused the pollen cell membrane to lose its flexibility faster than normal. Rehydration of dry-stored, irradiated pollen in water-saturated air restored germination percentages up to their initial levels. The importance of this procedure in germination trials is stressed. 相似文献
18.
[Objectives] To determine the optimum extraction technology for total phenols of leaves in Acanthopanax giraldii Harms.[Methods]The single factor test and ortho... 相似文献
19.
E. Keep 《Euphytica》1986,35(3):843-855
Summary Cytoplasmic male sterility (cms) is described in the F1 hybrids Ribes × carrierei (R. glutinosum albidum × R. nigrum) and R. sanguineum × R. nigrum. In backcrosses to R. nigrum, progenies with R. glutinosum cytoplasm were either all male sterile, or segregated for full male fertility (F) and complete (S) and partial (I) male sterility. Ratios of F:I+S suggested that two linked genes controlled cms, F plants being dominant for one (Rf
1) and recessive for the other (Rf
2).Segregation for cms in relation to three linded genes, Ce (resistance to the gall mite, Cecidophyopsis ribes), Sph
3(resistance to American gooseberry mildew, Sphaerotheca mors-uvae) and Lf
1(one of two dominant additive genes controlling early season leafing out) indicated that Rf
1and Rf
2were in this linkage group. The gene order and approximate crossover values appeared to be: % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXafv3ySLgzGmvETj2BSbqef0uAJj3BZ9Mz0bYu% H52CGmvzYLMzaerbd9wDYLwzYbItLDharqqr1ngBPrgifHhDYfgasa% acOqpw0xe9v8qqaqFD0xXdHaVhbbf9v8qqaqFr0xc9pk0xbba9q8Wq% Ffea0-yr0RYxir-Jbba9q8aq0-yq-He9q8qqQ8frFve9Fve9Ff0dme% aabaqaciGacaGaamqadaabaeaafaaakeaacaWGdbGaamyzamaamaaa% baGaaiiiaiaacccacaGGWaGaaiOlaiaacgdacaGG0aGaaiiiaiaacc% caaaGaaiiiaiaacccacaGGGaGaamOuaiaadAgaliaaigdakmaamaaa% baGaaiiiaiaacccacaGGGaGaaiiiaiaaccdacaGGUaGaaiOmaiaacs% dacaGGGaGaaiiiaiaacccacaGGGaGaaiiiaaaacaWGsbGaamOzaSGa% aGOmaOWaaWaaaeaacaGGGaGaaiiiaiaacccacaGGGaGaaiiiaiaacc% cacaGGGaGaaiiiaiaacccaaaGaamitaiaadAgaliaaigdakmaamaaa% baGaaiiiaiaacccacaGGGaGaaiiiaiaacccacaGGGaGaaiiiaiaacc% cacaGGGaGaaiiiaiaacccacaGGGaaaaiaadofacaWGWbGaamiAaSGa% aG4maaaa!6E4D!\[Ce\underline { 0.14 } Rf1\underline { 0.24 } Rf2\underline { } Lf1\underline { } Sph3\]. Crossover values of 0.36 for Ce-Lf
1, and 0.15 for Lf
1-Sph
3were estimated from the relative mean differences in season of leafing out between seedlings dominant and recessive for Ce and Sph
3.It is suggested that competitive disadvantage of lf
1-carrying gametes and/or zygotes at low temperatures may be implicated in the almost invariable deficit of plants dominant for the closely linked mildew resistance allele Sph
3. Poor performance of lf
1- (and possibly lf
2-) carrying gametes and young zygotes during periods of low temperature at flowering might also account for the liability of some late season cultivars and selections to premature fruit drop (running off). 相似文献
20.
Parasitic angiosperms cause great losses in many important crops under different climatic conditions and soil types. The most widespread and important parasitic angiosperms belong to the genera Orobanche, Striga, and Cuscuta. The most important economical hosts belong to the Poaceae, Asteraceae, Solanaceae, Cucurbitaceae, and Fabaceae. Although some resistant cultivars have been identified in several crops, great gaps exist in our knowledge of the parasites and the genetic basis of the resistance, as well as the availability of in vitro screening techniques. Screening techniques are based on reactions of the host root or foliage. In vitro or greenhouse screening methods based on the reaction of root and/or foliar tissues are usually superior to field screenings and can be used with many species. To utilize them in plant breeding, it is necessary to demonstrate a strong correlation between in vitro and field data. The correlation should be calculated for every environment in which selection is practiced. Using biochemical analysis as a screening technique has had limited success. The reason seems to be the complex host-parasite interactions which lead to germination, rhizotropism, infection, and growth of the parasite. Germination results from chemicals produced by the host. Resistance is only available in a small group of crops. Resistance has been found in cultivated, primitive and wild forms, depending on the specific host-parasite system. An additional problem is the existence of pathotypes in the parasites. Inheritance of host resistance is usually polygenic and its transfer is slow and tedious. Molecular techniques have yet to be used to locate resistance to parasitic angiosperms. While intensifying the search for genes that control resistance to specific parasitic angiosperms, the best strategy to screen for resistance is to improve the already existing in vitro or greenhouse screening techniques. 相似文献