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1.
以刺梨为试材,对影响ISSR．PCR扩增结果的主要影响因素包括Mg^2＋、TaqDNA聚合酶、dNTPs、引物、模版DNA的浓度及引物退火温度进行了优化筛选。确立了适合刺梨ISSR．PCR分析的最佳反应体系,即20μL反应体系中各组分浓度分别为：10×buffer 2．0μL,Mgz＋1．875mInoI／L。TaqDNA聚合酶1．0U,dNTPs0．1mmol／L,引物2．0μmol／L,模板DNA20ng。PCR扩增程序：94。c预变性5min,94℃变性1min,48℃退火温度45S,72℃延伸1min,34个循环,72℃后延伸6min。利用优化体系对3个刺梨品种进行体系稳定性检测,结果表明该优化体系的重复性和稳定性良好。 相似文献
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锥栗自然居群ISSR-PCR分析技术的建立 总被引：3，自引：0，他引：3
提取野生锥栗的基因组DNA作为ISSR-PCR模板,对反应体系中的模板用量、Mg2+浓度、dNTPs浓度、引物浓度和TaqDNA聚合酶用量5个主要影响因素进行梯度试验,并对扩增程序中的退火温度与循环次数进行了探讨,初步确立了适合野生锥栗的ISSR-PCR分析技术体系,即25μL反应体系中,模板DNA40或50ng、Mg2+2.25mmol.L-1、dNTPs0.2mmol.L-1、引物0.2μmol.L-1、TaqDNA聚合酶1.0U;PCR扩增程序为:94℃预变性3min;然后94℃变性45s,(Tm+2～4℃)退火45s,72℃延伸2min,共32个循环;最后72℃充分延伸5min;1.5%琼脂糖凝胶电泳分离扩增产物。 相似文献
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以30个茶花品种为试材,采用5因素4水平正交实验以及单因素优化试验方法,研究Mg2+浓度、dNTP浓度、引物浓度、Taq DNA聚合酶浓度和模板DNA浓度对ISSR-PCR指纹图谱条带清晰度的影响,以进行茶花品种ISSR-PCR反应体系优化及引物筛选。结果表明:茶花品种ISSR-PCR最适扩增条件为25μL反应体系中,Mg2+3.0mmol/L、dNTPs 0.2mmol/L、引物0.3mmol/L、Taq DNA聚合酶0.5U、模板DNA 80ng以及52.1℃退火温度;试验从100个ISSR引物中筛选出12个适用引物;并对12个ISSR引物的多态性和稳定性进行了检验。 相似文献
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以13个链格孢属小孢子种菌株为试材,采用正交实验设计的方法,研究Mg2+、dNTPs、Taq DNA聚合酶和引物4个因素在4个水平上对链格孢属小孢子种的ISSR和RAPD反应体系的影响。结果表明:链格孢属小孢子种ISSR和RAPD的最佳反应体系为25μL的ISSR-PCR反应体系中,10×PCR Buffer 2.50μL,Mg2+浓度为2.50mmol/L,dNTPs浓度为0.10mmol/L,引物浓度为0.30μmol/L,Taq DNA聚合酶用量为1.25U;在RAPD-PCR反应体系中,10×PCR Buffer 2.50μL,Mg2+浓度为2.00mmol/L,dNTPs浓度为0.15mmol/L,引物浓度为0.60μmol/L,Taq DNA聚合酶用量为1.25U;在此基础上,对最佳反应体系的退火温度进行了筛选确定;在确定退火温度后,采用最佳反应体系,用ISSR引物UBC808和RAPD引物OPE07进行稳定性和通用性验证,结果表明该优化反应体系具有较好的稳定性和通用性。 相似文献
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以杜鹃花为试验材料,采用正交实验方法,研究模板DNA浓度、ISSR引物浓度、dNTPs浓度、Taq DNA聚合酶浓度、Mg2+浓度等5个因素对ISSR-PCR反应体系的影响,以建立适合杜鹃花的ISSR-PCR最佳扩增体系。结果表明:杜鹃花ISSR反应体系的最佳条件为模板DNA用量为60ng/20μL,ISSR引物浓度0.60μmol/L,dNTPs浓度0.50μmol/L,Taq DNA聚合酶浓度30U/mL,Mg2+浓度为0.6mmol/L。采用该反应体系可以从10份杜鹃花(R.simsii)基因组内扩增出稳定性高、重复性好ISSR-PCR产物。该研究为杜鹃花的遗传多样性分析、ISSR指纹图谱构建、亲缘关系鉴定等研究奠定了基础。 相似文献
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山楂ISSR分析体系的建立和优化 总被引：16，自引：3，他引：16
为在DNA分子水平上对山楂种质资源进行分析奠定基础,对退火温度、循环次数、DNA模板质量、Mg2+浓度、Taq DNA聚合酶的种类和浓度等影响ISSR反应的因素进行研究,建立并优化了山楂的ISSR分析体系。优化的山楂ISSR分析体系为:采用改进的CTAB法或QIAGEN试剂盒法提取总DNA;PCR反应体积为20μL,内含1×PCR反应缓冲液(Promega公司),3.0mmol/L MgCl2,0.2mmol/L dNTP,0.3μmol/L引物,0.5U Taq DNA聚合酶(天根公司),50ng总DNA;扩增程序为94℃ 3min;94℃ 30s,退火温度1min,72℃ 2min,38个循环,72℃ 7min。筛选出了10个适宜山楂遗传分析的ISSR引物。 相似文献
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以偃麦草叶片DNA为模板,利用单因子和L16(45)正交实验设计对影响偃麦草SRAP-PCR反应效果的Mg2+、引物、dNTPs、DNA、Taq DNA聚合酶5种因素进行优化,并比较了不同退火温度对扩增反应的影响,通过综合比较分析建立偃麦草SRAP-PCR的优化反应体系。结果表明:优化的偃麦草SRAP-PCR总体系20μL中,Mg2+1.75 mmol/L,引物0.15μmol/L,dNTPs 0.20mmol/L,DNA 50ng,Taq DNA聚合酶0.75U,2μL 10×PCR buffer;Mg2+和引物浓度对扩增效果影响最大,DNA浓度影响最小;采用该体系对32份偃麦草进行验证,扩增结果清晰稳定,此体系的建立为利用SRAP分子标记进行偃麦草遗传多样性、抗性标记等研究奠定了技术基础。 相似文献
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干用辣椒RAPD-PCR反应体系及扩增程序的优化 总被引：2，自引：0，他引：2
以干用辣椒叶片为材料,研究了干用辣椒RAPD分析过程中的影响因素,包括Taq酶、Mg2+、dNTPs、引物、模板DTA浓度、退火温度、退火时间及循环次数等,建立适合干用辣椒RAPD反应的PCR体系,即25μL反应体系中含有Taq酶1.5 U、Mg2+2.5 mmol/L,dNTPs 0.6mmol/L、引物0.8μmol/L、模板DNA 60 ng.扩增程序为:94℃预变性4 min;94℃变性1 min,37℃退火1 min,72℃延伸1.5 min,40个循环;最后72℃延伸5 min.该优化体系在干用辣椒RAPD分析中获得较理想的扩增结果,为应用RAPD技术对干用辣椒遗传多样性奠定基础. 相似文献
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AIM: Although endovascular radiotherapy inhibits neointimal hyperplasia, the exact alterations induced by β-particles irradiation remain to be elucidated. The objective of this study was to investigate the ability and the cellular mechanism of local β-particles emission from 188Re to inhibit vascular smooth muscle cells (SMCs). METHODS: The SMCs in vitro were irradiated by 188Re with single doses of 2.6 Gy-25.8 Gy. The effects of β-particles on SMCs, such as effective irradiate doses, the period of inhibition for SMCs proliferation, the changes of cell proliferation rate and DNA synthesis rate, cell cycle progression and related gene expression, were investigated by cell count, [3H]-TdR incorporation, cell cycle progression analysis, cell viability and immunocytochemistry, respectivecy. RESULTS: β-particles irradiation with dose of 5.2 Gy could inhibit significantly SMCs proliferation. At dose of 20.6 Gy DNA synthesis inhibitory rate was 92%, SMCs proliferation rate was only 3%. Renoval of 188Re did not abolish the inhibitory effects of β-particles on SMCs proliferation. The expression of P53 was up regulation and PCNA was down regulation after irradiation. CONCLUSION: β-particles from 188 Re was significantly effective and permanent in inhibiting SMCs proliferation, and inhibitory effect was in dose-dependet manner ED50was 5 Gy, the best dose to inhibit SMCs proliferation was 20 Gy. β-particles irradiation induced SMCs to occur G0/G1 arrest, damaged the ability of SMCs reproliferation and led to cell clonogenic death. P53 and PCNA had regulatiory effects on SMCs proliferation after β-particles irradiation. 相似文献
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AIM:To study the effect of L-Arg on plasma content of endothelin (ET) and the expression of proto-oncogene c-fos mRNA in the left ventricle of rats with renovascular hypertensive hypertrophy. METHODS: The level of c-fos mRNA were measured by in situ hybridization. The ET in plasma were measured by radioimmunoassay. RESULTS:After eight weeks of treatment with L-Arg, the expression of c-fos decreased markedly (P＜0.01). The ET content in plasma also decreased significantly by L-Arg(P＜0.01).CONCLUSION: Plasma ET content and the expression of c-fos in the left ventricle of rats with renovascular hypertensive hypertrophy could be decreased by L-Arg administration. 相似文献
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AIM: To examine the autoantibody against α1-adrenoceptor and its biologic activities during the development of renal hypertension. METHODS: Renal hypertension of rat was achieved by clipped renal artery, the titre of autoantibody to α1-adrenoceptor was detected using ELISA immunoassay. Furthermore, the biological offects of these autoantibodies on cultured cardiomyocytes were also examined. RESULTS: After two weeks of clipping renal arteries, both the frequency of occurrence and the titre of autoantibodies to cardiac α1-adrenergic receptor were significantly increased as compared with the control of pre-treatment. The increased autoantibodies lasted for several weeks and then automatically decreased gradually to the pre-clipping level at 12 weeks. The biological effects of these autoantibodies displayed an "agonistic-like" activities on the beating frequency of cultured neonatal cardiomyocytes. CONCLUSION: Autoantibodies against α1-adrenoceptor may play a role in the elevation of peripheral vascular resistance and in the development of cardiac hypertrophy in rats with renal hypertension. 相似文献
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《International Journal of Fruit Science》2013,13(3):101-120
Abstract Saskatoon berry (Amelanchier alnifolia Nutt., Rosaceae) and blueberry (Vaccinium corymbosum L., Ericaceae) are substantially equivalent in all characteristics that are important to the consumer, including fruit color, shape, size, nutrition, texture, and uses. In addition, both fruits are native to North America and they have practically identical historical uses and known health benefits. Their composition, processing, nutritional value and metabolism, intended uses, and levels of undesirable substances are compared. 相似文献
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《International Journal of Fruit Science》2013,13(1):139-156
Abstract This review is based partly on complete articles and partly on abstracts. Three of the 60 articles deal with the total uptake of elements in strawberry plant organs in two different strawberry production systems, both considered as optimal concerning amount and balance of elements. The effect on fruit quality may be dramatic if the level of a particular element is outside this range, but there may also be effects initiated by differences within the optimal range of elements. Most articles refer to product oriented quality, but some focus on consumer oriented quality, as discussed by Shewfelt (1999). The discussion here is on a general basis, so one should keep in mind that there are cultivar differences and that specification of nutrition ideally should mirror the needs of a single cultivar, or a group of cultivars with similar requirements. Also, to get a complete understanding of the subject future reviews should embrace a broader access of information including the effect on plant development of individual elements, such as the role of calcium in fruit firmness and its importance in cell wall structure. However, the intention here is to narrow the information to results that suggest a direct connection between nutrient uptake and fruit quality. 相似文献
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The objective of this study was to establish a cryopreservation protocol for hawthorn shoot apices (Crataegus pinnatifida Bge.). Cryopreservation was carried out via encapsulation–dehydration, vitrification, and encapsulation–vitrification on shoot apices excised from in vitro cultures. We began by showing that cold-acclimation enhanced the regrowth of cryopreserved apices from 10.0 to 65.5% in encapsulation–dehydration. We then decided that the encapsulation–dehydration method was an optimal cryopreservation method for hawthorn shoot apices in terms of its high recovery after cryopreservation as well as its ease of use compared with vitrification and encapsulation–vitrification. In encapsulation–dehydration, the protocol leading to optimal regrowth was as follows: after cold-acclimation at 5 °C in the dark for 2 weeks, excised shoot tips were pretreated for 24 h at 25 °C on hormone-free Murashige and Skoog [Murashige, T., Skoog, F., 1962. A revised medium for rapid growth and bioassays with tobacco tissue culture. Physiol. Plant. 15, 473–497] (MS) basal medium with 0.4 mol/L sucrose, then encapsulated and precultured in liquid MS medium with 0.8 mol/L sucrose for 16 h at 25 °C. Precultured beads were dehydrated for 6 h at 25 °C in the dessicator containing 50 g silica gel to a moisture content of 15.3% (fresh-weight basis) before cryostorage for 1 h. In addition, we examined the effect of adding glycerol to both the alginate beads and loading solution to enhance regrowth after cryopreservation in encapsulation–dehydration. In the present study, it was shown that adding 0.5 mol/L glycerol resulted in high regrowth percentages (82.5–90.0%) in four Crataegus species. 相似文献
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多效唑对猕猴桃离体试管苗生长及内源激素的影响 总被引：18，自引：0，他引：18
多效唑（ＰＰ３３３）处理猕猴桃试管苗，降低了其生长强度；植株体内的ＧＡ３、ＩＡＡ和ＺＴ含量下降，ＡＢＡ的含量上升，乙烯释放率增加；并且能降低外源的ＧＡ３和ＩＡＡ促进生长的作用，而外源的ＧＡ３和ＩＡＡ又能不同程度地逆转多效唑的抑制作用，使植株恢复生长。 相似文献
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HU Zhi-cheng ZHU Jia-yuan ZHU Bin GUO Dong CHEN Bin ZHANG Kai HU Kun-hua LI Ming-tao TANG Bing 《园艺学报》2011,27(9):1802-1806
AIM: To investigate and screen the sensitive proteins in the formation mechanism of pathological scars by comparing the results of differential proteomic analysis between pathological scars and normal skin.METHODS: Two-dimensional gel electrophoresis was used to detect the protein expression profiles in 8 keloid patients, 8 hypertrophic scar patients and 3 matched normal skin patients.The proteins that showed differential expression of over 4-fold change were cut and analyzed by MALDI-TOF/TOF mass spectrometry.RESULTS: A two-dimensional protein profiling comparison between pathological scars and normal skin was successfully established.On average, 2 978 spots in keloid, 2 975 spots in hypertrophic scar and 3 053 spots in normal skin were identified using gel analysis software.Compared with normal skin, there were totally 36 differentially-expressed proteins in keloid and hypertrophic scar identified from the spots of over 4-fold change, including 16 proteins in both keloid and hypertrophic scar (8 up-regulated and 8 down-regulated), 11 only in keloid (9 up-regulated and 2 down-regulated) and 9 only in hypertrophic scar (4 up-regulated and 5 down-regulated).CONCLUSION: Proteomic analysis can identify the proteins with variance of pathological scars versus normal skin, thus providing probable new clues to reveal the formation mechanism of pathological scars. 相似文献
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Fulé Peter Z. Crouse Joseph E. Heinlein Thomas A. Moore Margaret M. Covington W. Wallace Verkamp Greg 《Landscape Ecology》2003,18(5):465-486
Fire regime characteristics of high-elevation forests on the North Rim of the Grand Canyon, Arizona, were reconstructed from fire scar analysis, remote sensing, tree age, and forest structure measurements, a first attempt at detailed reconstruction of the transition from surface to stand-replacing fire patterns in the Southwest. Tree densities and fire-/non-fire-initiated groups were highly mixed over the landscape, so distinct fire-created stands could not be delineated from satellite imagery or the oldest available aerial photos. Surface fires were common from 1700 to 1879 in the 4,400 ha site, especially on S and W aspects. Fire dates frequently coincided with fire dates measured at study sites at lower elevation, suggesting that pre-1880 fire sizes may have been very large. Large fires, those scarring 25% or more of the sample trees, were relatively infrequent, averaging 31 years between burns. Four of the five major regional fire years occurred in the 1700s, followed by a 94-year gap until 1879. Fires typically occurred in significantly dry years (Palmer Drought Stress Index), with severe drought in major regional fire years. Currently the forest is predominantly spruce-fir, mixed conifer, and aspen. In contrast, dendroecological reconstruction of past forest structure showed that the forest in 1880 was very open, corresponding closely with historical (1910) accounts of severe fires leaving partially denuded landscapes. Age structure and species composition were used to classify sampling points into fire-initiated and non-fire-initiated groups. Tree groups on nearly 60% of the plots were fire-initiated; the oldest such groups appeared to have originated after severe fires in 1782 or 1785. In 1880, all fire-initiated groups were less than 100 years old and nearly 25% of the groups were less than 20 years old. Non-fire-initiated groups were significantly older (oldest 262 years in 1880), dominated by ponderosa pine, Douglas-fir, or white fir, and occurred preferentially on S and W slopes. The mixed-severity fire regime, transitioning from lower-elevation surface fires to mixed surface and stand-replacing fire at higher elevations, appeared not to have been stable over the temporal and spatial scales of this study. Information about historical fire regime and forest structure is valuable for managers but the information is probably less specific and stable for high-elevation forests than for low-elevation ponderosa pine forests.This revised version was published online in May 2005 with corrections to the Cover Date. 相似文献
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AIM:To investigate the effect of metallothionein(MT) on proliferation of rat vascular smooth muscle cells (VSMCs) stimulated by homocysteine and its mechanism. METHODS:VSMCs proliferation was measured by [3-H]-TdR incorporation, mitogen-activated protein kinase(MAPK)activity were determined by immunoprecipitation method, the intracellular contents of MT and malondialdehyde (MDA)were assayed by -hemoglobin saturation method and TBA reaction, respectively, and lactate dehydrogenase (LDH) leakage was measured by NADH oxidation. RESULTS:Hcy(10-6-10-4 mmol/L) stimulated [3-H]-TdR incorporation by the VSMCs in a concentration-dependent manner. Compared with control, [3-H]-TdR incorporation in VSMCs treated with 0.1 mmol/L Hcy was increased by 4.2 fold (P＜0.01). Meanwhile, Hcy enhanced MAPK activity, MDA formation and LDH release (P＜0.01)in a concentration-dependent manner. Treatment of VSMCs with MT alone did not change above parameters, compared with control. However, MT (10-6-10-4 mol/L)attenuated significantly Hcy-stimulated proliferation of VSMCs (P＜0.01)in a concentration-dependent manner. And MT inhibited obviously Hcy-induced activation of MAPK activity, MDA formation and LDH release. Preincubation of VSMCs with 0.5 mmol/L ZnCl2 for 6 h induced an increase cellular MT content by 5.7-fold (P＜0.01). The MT-overexpressed VSMCs resisted Hcy-stimulating action on MAPK activity, MDA formation and LDH leakage (P＜0.01). CONCLUSION:These results show that MT has an inhibitory effect on Hcy-induced VSMCs proliferation, and that MT could inhibit Hcy-stimulated MAPK activity and lipid peroxidation. 相似文献