共查询到20条相似文献，搜索用时 78 毫秒
1.
为了获得适于龙珠果ISSR-PCR的反应体系,本研究以龙珠果叶片为试验材料,提取基因组DNA,采用L16(45)正交设计试验,对影响龙珠果ISSR-PCR扩增结果的Mg2+浓度、dNTPs浓度、Taq DNA聚合酶用量、引物浓度和模板DNA量进行优化,并筛选了最适退火温度。试验结果分析表明,各因素影响显著性为dNTPs浓度>Taq DNA聚合酶用量>Mg2+浓度>模板DNA量>引物浓度。在20μL反应体系中,dNTPs浓度0.2 mmol/L、Taq DNA聚合酶0.5 U、Mg2+浓度2.0 mmol/L、模板DNA 25 ng、引物浓度0.4μmol/L为最佳用量。实验从100条UBC引物中筛选得到22条多态性较好的引物。本研究为龙珠果ISSR标记开发、种质资源鉴定、遗传多样性分析和分子标记辅助选择育种等提供科学依据。 相似文献
2.
为建立适合新疆野生欧洲李的ISSR-PCR反应体系,本研究以野生欧洲李为供试材料,采用L16(45)正交试验设计和单因素试验设计相结合的方法,对影响野生欧洲李ISSR-PCR反应体系的5个因素(DNA模板,Taq酶,dNTPs,引物,Mg2+)进行筛选与优化,对16条引物的退火温度进行筛选。结果表明,Taq酶对PCR扩增反应的影响最大,野生欧洲李ISSR-PCR最佳反应体系为:总体积20μL,5 U Taq酶0.10μL,10 mmol/L引物1.00μL,2.5 mmol/L dNTPs 1.50μL,10×Buffer(含Mg2+)2.00μL,50 ng/μL DNA模板1.00μL,双蒸水14.40μL。建立的ISSR-PCR反应体系经过22份野生欧洲李样品验证,表明反应体系稳定可靠,可用于后续遗传多样性研究,为野生欧洲李种质资源的保护和利用提供理论参考。 相似文献
3.
为了建立金莲花ISSR-PCR最佳反应体系,本研究以内蒙古自治区境内野生金莲花为试验材料,采用L16(45)正交实验设计,对影响ISSR-PCR扩增结果的dNTPs、Taq DNA聚合酶、DNA模板、Mg2+、引物5个因素进行优化筛选,对反应程序进行优化。结果显示,每个因素都具有极显著差异,影响最大的为dNTPs,其余依次为Taq DNA聚合酶、DNA模板、引物,影响最小的为Mg2+浓度。最佳反应体系为:DNA模板30 ng,引物0.2μmol/L,Taq DNA聚合酶0.075 U/20μL,dNTPs 0.15 mmol/L,Mg2+1.0 mmol/L,反应总体积20μL。最佳扩增程序为:94℃预变性5 min,94℃变性30 s,52℃退火1 min,72℃延伸100 s,最后72℃延伸7 min,共38个循环,4℃保存。采用优化后的体系对金莲花不同居群进行验证,证明优化后体系扩增出明亮清晰的条带且重复性好,可用于后续金莲花遗传多样性分析。 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.
《分子植物育种》2016,(9)
利用正交设计L_(16)(4~5),对酥瓜ISSR-PCR反应体系的5个影响因素(引物,d NTPs,Taq DNA聚合酶,Mg2+和模板DNA)在4个水平上进行优化试验,并在36℃~56℃范围内摸索退火温度,建立适合酥瓜ISSR-PCR反应体系,结果表明,在20μL反应体系中,含有引物0.2μmol/L、d NTPs 0.3 mmol/L、Taq DNA聚合酶1.2 U、Mg2+1.0 mmol/L、DNA模板70 ng、10×Buffer 2.0μL为最佳反应体系,ISSR-PCR扩增程序中最佳退火温度为52.5℃。该体系为酥瓜种质资源的遗传多样性分析评价提供了帮助。 相似文献
6.
刺槐EST-SSR标记PCR反应体系的优化 总被引：2，自引：0，他引：2
为建立一套适用于刺槐EST-SSR标记的PCR反应体系,采用L16(45)正交试验设计结合单因素试验,对刺槐EST-SSR PCR反应体系中的5个主要因素：引物、DNA模板、dNTPs、Mg2+和Taq DNA聚合酶进行优化试验。结果表明：在20μL反应体系中,各反应因素的最佳水平为0.5μmol/L引物、30 ng模板DNA、0.15 mmol/L dNTP、0.5 mmol/L Mg2+、1.0 U Taq DNA聚合酶。利用随机挑选的3个刺槐优良无性系品种和7对EST-SSR引物对优化体系进行验证,结果均能获得稳定、清晰的条带,证明该体系稳定可靠。此优化体系的建立为刺槐EST-SSR标记的开发以及利用EST-SSR标记深入研究和利用中国刺槐种质资源奠定基础。 相似文献
7.
广东紫珠ISSR-PCR反应体系建立及引物筛选 总被引：2，自引：2，他引：0
为建立稳定性、重复性好的广东紫珠ISSR-PCR反应体系,以广东紫珠总DNA为试验材料,通过单因子结合正交试验对模板DNA浓度、dNTPs浓度、Mg2+浓度、引物浓度和Taq酶用量进行优化,确立了适用于广东紫珠的最佳ISSR-PCR反应体系：0.25 mmol/LdNTPs、1.00 U Taq DNA聚合酶、0.75μmol/L引物、2.0 mmol/L Mg2+、100 ng模板DNA,总反应体积为25μL。同时建立重复性和稳定性均较好的ISSR-PCR扩增程序：预变性94℃,5 min;变性94℃,30 s;退火温度与每个引物相对应,退火45 s;72℃延伸90 s;34个循环;后72℃延伸10 min;4℃保存,扩增结束。用来自不同居群4个个体,以100个ISSR引物进行PCR扩增,筛选出扩增效果较好的20个引物。 相似文献
8.
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
9.
本实验以产于四川、安徽、广东和青海的白芥农家品种为材料,采用单因素筛选和L16(45)正交设计相结合的方法,对白芥ISSR-PCR反应体系的Mg2+浓度、d NTPs浓度、引物浓度、Taq酶和模板DNA用量进行优化,建立最佳的白芥ISSR-PCR反应体系。结果表明:在20μL的PCR反应体系中,Mg2+浓度2.0 mmol/L、d NTPs浓度0.5 mmol/L、Taq DNA聚合酶0.2 U、引物浓度0.4μmol/L、模板DNA 60 ng为最佳用量。用4个白芥农家品种对建立的ISSR-PCR反应体系进行验证,表明该反应体系稳定性高、可重复性好,同时筛选出条带清晰、多态性较好的18条引物。该反应体系的建立为白芥ISSR标记开发、种质资源鉴定与筛选、遗传多样性分析和分子标记辅助育种等提供了帮助。 相似文献
10.
文冠果ISSR反应体系的建立及优化 总被引：2，自引：2，他引：0
为了建立文冠果ISSR-PCR最佳反应体系,从而为文冠果遗传多样性研究提供理论依据,从定西巉口林场文冠果人工林内选取健康嫩叶为试验材料,通过单因子试验研究了影响ISSR-PCR反应各因素的浓度,分析因子包括模板DNA用量、退火温度、dNTP浓度、Mg2+浓度、引物浓度及TaqDNA聚合酶用量等。通过研究,找出了各因子合适的条件,建立并优化了文冠果ISSR反应体系,即20μL总反应体系含模板DNA约30 ng,Mg2+2.5 mmol/L,引物0.2μmol/L,dNTP 0.20 mmol/L,Taq聚合酶1 U。试验结果表明,在此反应体系下可得到多样性好、条带清晰的图谱。 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.
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
14.
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
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