共查询到20条相似文献，搜索用时 47 毫秒
1.
研究血人参中的类黄酮成分,为提升血人参药材品质提供参考。本研究采用UPLC/Q-TOF-MS技术及类黄酮靶标代谢组学技术分析血人参根中的类黄酮成分,比较两种技术在类黄酮成分分析和鉴定中的差异。通过UPLC/Q-TOF-MS技术从血人参根中鉴定出14中类黄酮成分,通过类黄酮靶标代谢组学技术分析鉴定出61种类黄酮成分。原花青素B2、儿茶素、表儿茶素、表儿茶素没食子酸酯等4种成分是血人参根中的主要类黄酮物质。研究结果不仅可帮助揭示血人参药材的品质形成机制,还可为开发改良调控类黄酮物质积累种植技术提供参考。 相似文献
2.
大豆植株中类黄酮对大豆胞囊线虫的毒杀效果及机理研究 总被引：1，自引：0，他引：1
于2013年采用索氏提取法对大豆植株中类黄酮物质进行了提取,通过外源添加法研究了不同大豆品种对大豆胞囊线虫杭氧化酶活性的影响。试验结果表明,杭、感品种类黄酮粗提物对大豆胞囊线虫卵孵化、J2幼虫均有一定的抑制作用。处理48h,抗病品种根类黄酮提取物对卵孵化的抑制率明显高于感病品种;杭病品种根类黄酮提取物对J2的校正死亡率比感病品种明显降低;杭、感品种根类黄酮提取物对线虫体内的谷耽甘肤转硫酶(GST)活性的影响差异不大,但明显大于其茎叶提取物;杭、感品种根内类黄酮提取物对过氧化氢酶(CAT)活性抑制作用差异明显,且感病品种根内类黄酮提取物对线虫体内CAT活性的影响明显大于抗病品种。 相似文献
3.
基于转录组和代谢组解析香瓜茄果实类黄酮代谢差异 总被引：1，自引：0，他引：1
为了解香瓜茄果实主要类黄酮成分以及不同栽培种间类黄酮物质的代谢差异,以我国当前主栽的淡椭圆形果实(LOF)和甜圆形果实(SRF)2个香瓜茄栽培种类型为对象,对成熟果实进行转录组和代谢组联合分析。结果表明,香瓜茄果实中类黄酮组分共鉴定出9类二级代谢产物,41种三级代谢产物,黄酮醇含量最高。具有显著差异的代谢物有21种,主要分布在黄烷醇类、黄酮碳糖苷等6类二级代谢物质中。LOF的二氢黄酮、黄烷醇类、异黄酮的含量高于SRF,而黄酮醇等其他类黄酮化合物则在SRF中含量较高。RNA-seq分析共鉴定出与类黄酮代谢相关的基因503条,其中类黄酮合成通路上游的苯丙氨酸解氨酶(PAL)、肉桂醇脱氢酶(CAD)、黄烷酮-3-羟化酶(F3H)等关键基因表达在LOF中较SRF均上调,而黄酮醇合成酶基因(FLS)表达则在SRF中高于LOF。根据转录组的结果,4个类黄酮合成酶的表达趋势与RT-PCR的检测结果一致。研究结果表明,在不同香瓜茄资源LOF和SRF中存在大量的类黄酮化合物及其合成酶基因,但不同类黄酮成分及其合成代谢相关酶在不同资源含量均存在差异。 相似文献
4.
为了拓展气象服务领域,解决当地主要经济作物向日葵生产中有关农业气象方面的问题。利用阿勒泰国家基准站2000—2014年观测资料,对阿勒泰市向日葵发育期的光热水资源变化,及各发育期日期与≥0℃积温、日照时数和降水量的相关性进行研究。结果表明:全发育期天数的变化呈增加趋势,出苗期、全发育期通过信度(P=0.10)的正相关显著性检验;全发育期的≥0℃积温和日照时数呈线性增加趋势变化,出苗期≥0℃积温、日照时数与年份的相关系数均通过信度(P=0.10)的正相关显著性检验;全发育期的降水量呈弱的线性减少趋势变化。造成这些差异的主要原因可能是各年的气候条件不同,其次是各年份的栽培条件、田间管理(如灌溉、施肥、病虫害防治)等非气象因子的不同所致,各年作物的生长及发育都是气象因子和非气象因子共同作用的结果。 相似文献
5.
为了明确巴西蕉果肉类黄酮生物合成的特点及其关键酶基因的差异表达特性,本研究选取抽蕾期(0 DAF)、断蕾期(20 DAF)、采收期(80 DAF)、成熟度Ⅱ期(8 DPH)、成熟度Ⅵ期(16 DPH)的巴西蕉的果肉,分别测量总黄酮的含量,观察其变化趋势。分别提取根、叶、花、果实以及上述五个时期的果肉RNA进行转录组测序,分析类黄酮生物合成关键酶基因在不同组织器官及不同发育成熟阶段的表达特性,并对其中10个关键酶基因的表达进行验证。结果表明从抽蕾期至断蕾期再到采收期,巴西蕉果肉黄酮含量呈明显的下降趋势,至采收时下降到最低点,在采后成熟过程中小幅上升再下降。类黄酮生物合成6个关键酶基因家族共78个基因在巴西蕉不同组织器官中是差异表达的,其中3个基因在根、叶、花和果实中都高水平表达,有42个、11个、18个、8个基因分别在根、叶、花、果实中高表达;这78个基因也在巴西蕉果实不同发育成熟阶段差异表达,有4个基因在果实发育成熟阶段都高水平表达,有27个、27个、19个、15个、9个基因分别只在抽蕾期、断蕾期、采收期、成熟度Ⅱ期和成熟度Ⅵ期中高水平表达;类黄酮生物合成关键酶基因CHS(Ma02_t24860.1)、CHI(Ma11_t21950.1)和F3'H(Ma03_t31570.1和Ma05_t26350.1)与总黄酮的变化趋势相似,推测这4个关键酶基因在香蕉果实黄酮生物合成过程中具有非常重要的作用。研究结果可为解析巴西蕉类黄酮生物合成的分子机制提供帮助。 相似文献
6.
转基因水稻恢复系及其F1代Bt蛋白的时空表达分析 总被引：1，自引：0，他引：1
本研究以抗虫水稻恢复系9311(Bt)及其杂交种F1(Bt)为研究材料,以非转基因的9311为阴性对照,利用ELISA方法研究9311(Bt)及F1(Bt)各生育时期可溶性总蛋白和Bt蛋白的时空变化规律,为转Bt基因抗虫水稻的安全监管提供科学依据。结果表明：外源基因的导入没有引起水稻组织中可溶性总蛋白含量的明显变化;9311(Bt)的Bt蛋白表达量在整个生长周期的各个部位均高于相应的F1(Bt)植株;同一植株不同组织器官中Bt蛋白表达量为：叶片跃胚乳跃颖壳及茎秆跃根;同一植株不同发育期叶片Bt蛋白的测定结果整体表现为：营养生长阶段跃生殖生长阶段跃成熟衰老阶段。研究结果为转Bt基因抗虫水稻适宜检测时期的选择提供了一定的参考。 相似文献
7.
不同彩叶矾根品种苗期在贵州冬季生长适应性比较 总被引：2，自引：0，他引：2
以引进的巧克力纱、银色卷轴、教堂窗户、李子布丁、拼图、红宝石、海浪等7个矾根品种为试验材料,在贵州冬季寡日照环境下研究不同品种矾根苗期叶长、叶宽、叶片数等生长性状的差异性.结果表明,7个矾根品种苗期叶长、叶宽总体上都呈上升趋势,在贵州适应性良好,且李子布丁和海浪2个矾根品种在形态指标上都与其它5个品种之间存在显著差异性,其中第3生长阶段株幅达到了18.075 cm和18.575 cm的最大值.通过本试验,以期为西南地区矾根品种的引种、筛选、驯化提供形态生长适应性上的参考依据. 相似文献
8.
为明确"贵长"猕猴桃适宜的采收期,以"贵长"猕猴桃为试验材料,研究不同的采收期间(采收期1(H1,果实生长发育期120 d)、采收期2(H2,果实生长发育期130 d)、采收期3(H3,果实生长发育期140 d)、采收期4(H4,果实生长发育期150 d))在两种后熟途径(其中一种后熟途径为采收后直接进行货架期试验,另一种后熟途径为采收后冷藏90 d再进行货架期试验)下果实的品质和酶活性变化.结果表明:采收期H2和采收期H3在两种后熟途径过程中均能够不同程度地抑制果实可溶性固形物含量、可滴定酸含量、VC含量和超氧化物歧化酶(SOD)活性的下降,保持果实抗坏血酸过氧化物酶(APX)、过氧化氢酶(CAT)和过氧化物酶(POD)活性,降低脂氧合酶(LOX)活性.因此,建议"贵长"猕猴桃采收期为生长发育期130～140 d,有利于保证果实的后熟品质,适宜长期贮藏. 相似文献
9.
玉米秸秆腐解液中酚酸的检测及对小麦土传病原菌的化感作用 总被引：3，自引：1，他引：2
在不同时期提取玉米秸秆腐解液,利用高效液相色谱检测其中酚酸类物质及其含量,并测定检测到的不同酚酸类物质对小麦土传病原菌孢子萌发和菌丝生长的影响率。结果表明,在玉米秸秆腐解液中共检测到5种酚酸类物质,不同时期提取的腐解液中酚酸类物质的种类和含量有所不同,其中在同期腐解液中邻苯二甲酸和苯甲酸含量明显高于其它3种酚酸;5种酚酸类物质对3种病原菌的菌丝生长及对G.graminis和B.sorokiniana的孢子萌发具有不同程度的促进或抑制作用,且随着浓度的增高而作用趋势增强。 相似文献
10.
类黄酮物质是苯丙素途径次级代谢产物,可直接影响生长素载体分布、活性以及含量来调节生长素极性运输,或间接影响蛋白激酶/磷酸酶拮抗作用、相关蛋白活动、细胞膜流动性、ROS含量、细胞环境等调控生长素运输与分布,类黄酮物质亚组黄酮醇为生长素内源调节剂主要活性物质。此外,黄酮醇糖基化形式可调控生长素代谢,生长素能影响转录因子、ROS含量、细胞分裂素等反馈调节类黄酮物质合成。因此,类黄酮物质不仅能够调控生长素运输、代谢,还能整合生长素与其它激素、ROS、转录调控等信号途径。本综述总结类黄酮物质对生长素的作用,扩充类黄酮物质在植物体内的生物作用,为类黄酮物质参与植物生长发育与响应环境胁迫等过程的研究提供参考。 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.
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
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