共查询到20条相似文献，搜索用时 15 毫秒
1.
《Medicinal Plant》2014,(5)
[Objective] To establish a content detection method for the total flavonoids in Melastom adodecandnun Lour. [Methods]Content of total flavonoids in M. adodecandnun was detected by UV-Vis spectrophotometry. [Results]When the content of total flavonoids in M. adodecandnun was detected by UV-Vis spectrophotometry,there was good linear relationship(r = 0. 999 6) within the range of 0. 004 16- 0. 066 59mg/mL. The average recovery rate was 98. 85% and RSD was 2. 75%. [Conclusions]This method was accurate,simple and could be used for the content detection of total flavonoids in M. adodecandnun. 相似文献
2.
硒对苦荞产量、营养与保健品质的影响 总被引：4，自引：0，他引：4
采用盆栽试验研究了土壤施硒对苦荞生长、产量及营养与品质的影响。结果表明, 适量施硒(0.5 mg kg-1)能促进苦荞生长, 显著提高株高、地上部干重和总干重。施硒量≤1.0 mg kg-1时, 苦荞产量是不施硒处理的1.42~2.32倍, 株穗数和株粒数为不施硒处理的近2倍, 结实率提高0.6~6.2个百分点, 百粒重提高1.90%~5.85%, 黄酮和芦丁含量分别提高3.7%~7.5%和30.9%~59.6%, 以施硒0.5 mg kg-1处理效果最佳, 显著提高产量和各品质性状。施硒量＞1.0 mg kg-1各处理显著抑制苦荞植株生长, 使株高、干重、产量显著下降, 黄酮和芦丁含量分别降低4.4%~6.3%和1.06%~19.20%。苦荞籽粒中N、P、K、Zn、Ca、Mn、粗蛋白、粗脂肪、必需氨基酸、非必需氨基酸含量和氨基酸总量, 除施硒0.5 mg kg-1处理外, 均随施硒量的增加而提高。土壤施硒显著提高了苦荞籽粒的硒含量, 但不同程度地降低了淀粉含量。适量施硒对苦荞具有明显的增产和改善营养与保健品质的作用。 相似文献
3.
盐和水分胁迫对不同荞麦品种生理特性的影响 总被引：2，自引：0，他引：2
以甜荞（平荞2号）和苦荞（黔苦2号）为实验材料,研究NaCl和等渗PEG对荞麦根系活力、质膜透性、MDA含量及净光合速率的影响。低盐度处理时两种荞麦根系活力明显增强,苦荞增加幅度较大,甜荞根部和叶片质膜透性及MDA含量明显增加,苦荞叶片净光合速率明显增加;高盐度处理时两种荞麦根系活力仍保持较高的水平,甜荞根部和叶片质膜透性及MDA含量增加幅度明显大于苦荞,甜荞叶片净光合速率明显下降且下降幅度明显大于等渗PEG处理,而苦荞叶片净光合速率与对照无明显差异。说明质膜透性、MDA含量和净光合速率是荞麦抗逆性敏感生理指标,苦荞的耐胁迫性大于甜荞。 相似文献
4.
《Medicinal Plant》2015,(Z1)
[Objective] To research on the changes of total polysaccharides content and plant morphology in the 1- to 5-year-old leaves of Panax quinquefolius L.,which were harvested from May to September in Canada.[Methods]Plant morphological characteristics( length,diameter,dry weight and fresh weight) of the leaves of P. quinquefolius with different growth years in different harvest periods were detected; and the drying rate was calculated. Total polysaccharides content in the leaves of P. quinquefolius was detected by UV spectrophotometry. [Results]The dry rates of P. quinquefolius stems with different growth years had no significant differences( P = 0. 278 8 0. 05) with two-year-old leaves( 0. 394) one-year-old leaves( 0. 372) five-year-old leaves( 0. 30) three-year-old leaves( 0. 27) four-year-old leaves( 0. 26).Drying rates of P. quinquefolius leaves in different harvest periods showed significant differences( P = 0. 028 9 0. 05). According to the mean values,it could be concluded that July( 0. 452) May( 0. 348) June( 0. 274) September( 0. 26) August( 0. 248). The total polysaccharides content of P. quinquefolius leaves had extremely significant changes in different growth years( P = 0. 000 0 0. 01) with two-yearold leaves( 16. 678 mg / g) three-year-old leaves( 15. 154 mg / g) four-year-old leaves( 14. 559 mg / g) one-year-old leaves( 13. 497 mg / g) five-year-old leaves( 11. 929 mg / g). Total polysaccharides contents of P. quinquefolius stems also had extremely significant changes in different harvest periods( P = 0. 000 0 0. 01) with June July August May September.[Conclusions]In the leaves of P. quinquefolius,content of total polysaccharides had little correlation with the drying rate. Therefore,the content of total polysaccharides could not be judged by the drying rate of the leaves of P. quinquefolius. Total polysaccharides contents in one-to five-year-old P. quinquefolius leaves firstly enhanced and then decreased from May to September,and were the relatively high in June. Two-year-old P. quinquefolius leaves had the maximum content of average total polysaccharides. According to the previous researches,the average contents of total polysaccharides in P. quinquefolius roots,stems and leaves were 8. 4%,2. 6% and 1. 5%,respectively. The sum of total polysaccharides contents in P. quinquefolius stems and leaves was 4. 1%,which was only 1 /2 of the total polysaccharides content in roots. Stems of P. quinquefolius were usually abandoned during the harvest of RADIX PANACIS QUINQUEFOLII in Ontario of Canada. Therefore,it was suggested that the stems( aboveground parts) of P. quinquefolius could be used as the raw materials for the extraction of total polysaccharides. 相似文献
5.
我国主栽棉花品种的棉籽油资源评价与分析 总被引：3，自引：1，他引：2
【目的】探讨不同地区、不同棉花品种棉籽油脂肪酸含量与组成的差异。【方法】以收集于我国棉花主产区的82份棉花品种的棉籽为试验材料,采用索氏法提取种子中粗脂肪,并利用气相色谱法分析脂肪酸组成和含量,最后通过聚类分析等分析脂肪酸组成与棉花品种和产地之间的内在联系。【结果】棉籽仁脂肪总含量在188.4~302.8 mg·g~(-1),平均为249.52 mg·g~(-1)。棉籽仁中主要脂肪酸为亚油酸(104.88~180.68 mg·g~(-1))、棕榈酸(41.53~69.77 mg·g~(-1))、油酸(28.29~48.86 mg·g~(-1))和硬脂酸(3.56~6.8 mg·g~(-1));各品种脂肪酸含量具有差异。聚类分析表明,棉籽脂肪酸总含量和脂肪酸组成与产地具有相关性。【结论】本研究筛选得到棉籽脂肪酸总含量以及油酸、亚油酸、亚麻酸高的材料,明确了82份种质资源的棉籽油分特征、特性和利用价值。 相似文献
6.
为了建立快速检测猪血凝性脑脊髓炎病毒（HEV）的RT-PCR方法,根据GenBank中HEV的HE基因和S基因设计了1对引物,在优化RT-PCR反应条件的基础上,成功的扩增出323bp的特异性条带。检测与HEV亲缘性较高的牛冠状病毒及猪的伪狂犬病毒均为阴性,最低可以检测到10个TCID50/100μl的病毒,说明该方法的有较好的特异性和敏感性。用此RT-PCR方法对感染HEV的小鼠和猪进行检测,结果能从发病动物的多种组织中检测到病原,其中以脑组织的检出率最高。因此,临床疑似病例检测时以脑组织为最佳检测样本 相似文献
7.
为探索提高荞麦产量和品质的施肥技术,运用三因素随机区组设计法,研究了现蕾期和盛花期喷施锌、硼微肥对荞麦产量及品质的影响。结果表明,单施锌、硼肥显著提高了荞麦籽粒蛋白质含量、千粒重及产量,显著降低了总黄酮含量,单施锌、硼肥的最高浓度为60和45mg/L,配施锌浓度为60mg/L、硼为30mg/L;适宜喷施时期为现蕾期;锌、硼肥配施对籽粒蛋白质和产量形成具有增效性,对籽粒总黄酮的形成具有拮抗性,有效减轻了总黄酮的降低程度。由此可知,适量的锌、硼微肥配施,可显著提高荞麦籽粒产量和蛋白质含量。 相似文献
8.
bZIP转录因子不仅在植物盐胁迫网络中起着重要的作用,还可调节植物类黄酮的积累。在苦荞品种川荞1号中克隆了1个具有转录激活活性的bZIP家族基因FtbZIP5。FtbZIP5基因能被NaCl和脱落酸（ABA）诱导表达,在茎和叶中的表达高于根中。对过表达FtbZIP5基因毛状根的总黄酮含量进行检测,结果显示,总黄酮含量在过表达株系中显著高于野生株系。同时检测其类黄酮合成途径中关键酶基因的表达量,其中黄烷酮-3-羟化酶基因（F3H）的表达量较高。可推测该过表达毛状根株系中总黄酮的积累与F3H的表达有关。在NaCl（100mmol/L）胁迫下,各株系的总黄酮积累受到抑制,过表达株系的含量减少至0.63mg/g。并且,在这种压力下,F3H的表达水平仍然高于对照。植株在受到胁迫后,对照株系的过氧化氢酶（CAT）活性显著低于过表达株系。随着野生型植株受到胁迫的增强丙二醛（MDA）含量增加,但过表达株系的含量趋于稳定。以上结果表明,在过表达FtbZIP5毛状根中,总黄酮的积累可能是通过关键酶基因F3H的上调表达来调节的。并且FtbZIP5可提高苦荞毛状根耐盐性。通过解析FtbZIP5对苦荞毛状根中总黄酮积累及植株耐盐性的影响,为荞麦耐盐性和解析其耐盐机制研究奠定基础。 相似文献
9.
藜麦苗生长过程中功能成分含量及抗氧化活性变化研究 总被引：2，自引：0，他引：2
为促进藜麦苗这一新型苗菜产品的开发,以筛选的高黄酮（0.72mg/g）、高多酚（1.97mg/g）藜麦种子（YY22）为材料,对藜麦苗生长14~48d过程中总黄酮、总多酚和总皂苷的含量进行测定分析,并分别用DPPH法和ABTS法评价其抗氧化活性。结果显示：藜麦苗初期生长较为缓慢,约20d后生长加快,藜麦苗株高在第48天达37.37cm;藜麦苗总黄酮和总多酚含量在生长期总体呈下降趋势,但均高于种子中的含量;总皂苷含量呈动态变化,在第48天时最低,各生长时期的皂苷含量均较种子的低;藜麦苗抗氧化活性随生长进程降低,且与总黄酮含量呈显著正相关,与总多酚含量呈极显著正相关。生长48d时,藜麦苗生物产量高,品质较为鲜嫩,总黄酮（3.19mg/g）和总多酚（4.36mg/g）较高,具备一定的DPPH和ABTS清除活性,总皂苷含量（2.28mg/g）较低,适口性较好。 相似文献
10.
不同水分条件下不同抗旱性苦荞根系生长规律研究 总被引：1，自引：0，他引：1
为了探明不同抗旱性苦荞根系形态和生理特性与抗旱性的关系,为干旱胁迫下苦荞高产优质栽培管理及抗旱品种的筛选提供理论依据,采用人工控水的方法,研究并分析了正常供水、重度干旱条件下不同抗旱性苦荞品种迪庆苦荞（耐旱）、黑丰1号（旱敏感）根系生长形态和生理指标变化。结果表明,干旱胁迫显著增加了苦荞根冠比、根系丙二醛（MDA）和脯氨酸（Pro）含量,而最大根长、根体积、根表面积显著降低。随着生育期推进,各处理苦荞最大根长、根体积、根表面积、MDA含量等指标均呈现逐渐增加趋势,根冠比、Pro含量呈现先增后减趋势。品种之间方差分析结果表明,重度干旱胁迫条件下,各测定时期迪庆苦荞的根冠比、最大根长、根体积、根表面积、根系Pro含量均显著高于黑丰1号,MDA含量则显著低于黑丰1号。回归分析表明,不同处理苦荞根表面积、最大根长等指标在测定时期内随时间变化的数学模型均符合指数函数,根体积、MDA含量等指标均符合一元二次方程的规律。干旱胁迫下苦荞根系与地上部分的生长均受到抑制,且表现为对地上部的影响大于对根系;与黑丰1号相比,迪庆苦荞耐旱性更强。 相似文献
11.
【研究目的】对甘草离体培养物中总黄酮提取和测定工艺进行优化,以建立在室内筛选高产细胞系和试管苗株系的方法;【方法】采用超声波提取技术,对提取液、浸泡时间、提取温度等进行优化;【结果】将样品以75%甲醇浸泡6h后在32℃下超声提取两次,比色法测定总黄酮含量,加样回收率为95.3%～101.4%,相对标准偏差为1.61%。测得甘草初代愈伤组织中总黄酮含量为0.0012%～0.05%,子叶愈伤组织调控后含量高达0.08%,试管苗中总黄酮含量为1.04%～1.31%,移栽后高达4.5%。【结论】此工艺准确度较高、稳定性好、简便可行,为优良细胞系的筛选和试管苗的早期鉴定奠定了技术基础。 相似文献
12.
苦荞中查尔酮合成酶基因（CHS）的克隆 总被引：1，自引：1，他引：0
获得完整的苦荞查尔酮合成酶基因（CHS）信息并评价其进化地位,对分子辅助选育高黄酮含量的苦荞品种具有重要的指导意义。用RACE法克隆苦荞CHS基因,用生物信息学手段分析预测苦荞CHS基本理化性质和同源性,用临接法构建了该酶的系统发生树。获得1250 bp的CHS cDNA全长,含241 bp的3’UTR和185 bp的5’UTR;等电点（pI）和分子量（Mr）分别为5.33和35340.75 Da;克隆获得975 bp的开放性阅读框（ORF）。预测该基因编码含325个氨基酸残基的蛋白,氨基酸同源比对结果表明,苦荞CHS与蓼科的虎杖相似性很高;临接法构建的系统发生树结果表明,苦荞CHS与其他双子叶植物有共同的起源,与蓼科的金荞麦、甜荞、虎杖及石竹科的满天星亲缘关系较近。成功获得苦荞CHS基因的cDNA全长,克隆出完整的ORF,并确定了苦荞中该酶的进化地位和方向。 相似文献
13.
《Medicinal Plant》2014,(5)
[Objective] To research on the changes of total polysaccharides content and plant morphology in the 1- to 5-year-old stems of Panax quinquefolius L.,which were harvested from May to September in Canada. [Methods]Plant morphological characteristics(length,diameter,dry weight and fresh weight) of the stems of P. quinquefolius with different growth years in different collection months were detected;and the dry rate was calculated. Total polysaccharides content in the stems of P. quinquefolius was detected by UV spectrophotometry; and DPS2000 was used for data analysis. [Results]Plant morphological characteristics of the stems of P. quinquefolius showed a increasing trend as the growth years and harvest period prolonged. dry rates of P. quinquefolius stems with different growth years had significant differences(P=0.013 1 0.05),which were in the order of one-year-old stems(0.348) two-year-old stems(0.296) five-year-old stems(0.202) four-year-old stems(0. 174) three-year-old stems(0. 164). dry rates of P. quinquefolius stems in different harvest periods showed extremely significant differences(P = 0. 005 8 0. 01),which were in the order of July May June August September. Total polysaccharides contents of P. quinquefolius stems had extremely significant changes in different growth years(P = 0. 000 0 0. 01),which were in the order of two-year-old stems(30. 818 mg /g) one-year-old stems(28. 172 mg /g) three-year-old stems(26. 642 mg /g) four-year-old stems(24.89 mg/g) five-year-old stems(19.492 mg/g). Total polysaccharides contents of P. quinquefolius stems also had extremely significant changes in different harvest periods(P = 0. 000 0 0. 01),which were in the order of June July August May September. Content of total polysaccharides had little correlation with the dry rate. Therefore,the content of total polysaccharides could not be judged by the dry rate of the stems of P. quinquefolius. [Conclusions]The stem yield and polysaccharides content of P. quinquefolius were both at a relatively high level. Therefore,it was suggested that the stems of P. quinquefolius could be used as the extraction raw materials of total polysaccharides,considering from the angle of comprehensive utilization of P. quinquefolius. 相似文献
14.
不同采收时期金银花中化学成分及其相关酶活性分析 总被引：1，自引：0，他引：1
为进一步探讨金银花活性成分动态变化规律,对不同采收期金银花和叶中活性成分含量及其相关酶活性进行研究。测定不同时期金银花及叶中的总酚、类黄酮、绿原酸等活性成分的含量以及苯丙氨酸解氨酶(PAL)、肉桂酸4-羟基化酶(C4H)、多酚氧化酶(PPO)、过氧化物酶(POD)、超氧化物歧化酶(SOD)的活性,并进行相关性分析。从幼蕾期到金花期,金银花中总酚、类黄酮的含量呈逐渐下降趋势,幼蕾期达到最高值,分别为4.42 mg/g、13.29 mg/g;绿原酸在三青期达到最高值,为33.37 mg/g。叶中的总酚、类黄酮含量呈现波动变化趋势;绿原酸呈现逐渐下降规律,含量与花中相差不多。相关性分析得出金银花中的C4H,PPO,POD与活性物质含量呈正相关关系。花和关联叶中的活性成分含量相差不大,可进一步开发叶子的利用价值。本研究对调控金银花质量和指导相关管理规范提供理论参考。 相似文献
15.
荞麦属(Fagopyrum Mill)植物资源的RAPD研究 总被引：2，自引：0，他引：2
以10个随机引物对荞麦属(Fagopyrum)11个种(含大粒组7个种,小粒组4个种)共50份栽培及野生荞麦资源进行RAPD研究.初步建立了养麦属不同物种的RAPD指纹图谱.系统聚类分析表明,荞麦属大粒组和小粒组组间以及不同荞麦种间在DNA水平上差异极大.在大粒组中苦荞DNA与其他种之间有较大的差异.大野荞和毛野荞分别与甜荞和苦荞在RAPD水平上较近缘,支持它们分别是甜荞和苦荞祖先种的假说. 相似文献
16.
为筛选桔梗和白花蛇舌草中的抗肿瘤活性成分,制备桔梗总黄酮、总皂苷提取物,白花蛇舌草总黄酮、总蒽醌提取物,采用亚硝酸钠-硝酸铝比色法检测总黄酮含量,香草醛法检测总皂苷含量,紫外吸收法检测总蒽醌含量,采用四甲基偶氮唑蓝比色法(MTT)检测四种提取物对人肺癌细胞A549的抑制作用。结果表明：桔梗和白花蛇舌草总黄酮含量分别为5.51% 和1.19%,桔梗总皂苷含量为1.71%,白花蛇舌草总蒽醌含量为7.81%。桔梗总皂苷浓度为0.04 mg/mL时,对人肺癌细胞A549抑制率达到87.59%,桔梗总黄酮浓度为0.5 mg/mL时,抑制率达到89.16%。白花蛇舌草总蒽醌浓度为1.2 mg/mL时,抑制率达到34.76%;白花蛇舌草总黄酮浓度为0.3 mg/mL时,抑制率达到24.33%。试验认为,桔梗总黄酮和总皂苷对肺癌细胞A549的抑制作用较强,可为抗肿瘤药物的研究提供参考。 相似文献
17.
陆地棉色素腺体与不同棉酚旋光体含量之间的相关性研究 总被引：2，自引：2，他引：2
【目的】研究不同基因型棉花不同器官的色素腺体与棉酚旋光体含量之间的相关性。【方法】以6个陆地棉材料中棉所12、中棉所12(无)、珂字棉312、珂字棉312(无)、IF11和冀棉14为对象,精确测定主要器官的色素腺体密度和大小,并采用柱前衍生拆旋方法进行高效液相色谱分析,测定其相应的棉酚旋光体含量,然后对色素腺体和棉酚旋光体含量进行相关性分析。【结果】低酚棉全株无色素腺体,但在各器官中仍能检测到低于0.02%(质量分数)的少量游离棉酚存在。有酚棉各器官均具有典型的色素腺体,其中棉仁的色素腺体最密,苞叶最稀;色素腺体大小(直径)以铃壳最大,花瓣和棉仁最小。不同器官中,总棉酚含量以棉仁最高,苞叶最小;棉仁和花瓣的右旋棉酚含量大于左旋棉酚,而萼片、铃壳、上部叶、中部叶和下部叶的左旋棉酚含量大于右旋棉酚。有酚棉的色素腺体密度与大小之间呈极显著负相关;而总棉酚含量与不同棉酚旋光体含量之间,以及左右旋棉酚含量之间呈极显著正相关。色素腺体密度与总棉酚含量以及不同棉酚旋光体含量之间呈极显著的正相关,而色素腺体大小与右旋棉酚含量之间呈显著的负相关。【结论】棉仁与花瓣的总棉酚含量存在高度的相关性,因此,可以通过花瓣的棉酚含量来判断棉仁的棉酚含量。 相似文献
18.
《Medicinal Plant》2015,(Z2)
[Objective] To discuss the protective effects of Coriolus versciclor polysaccharides on liver injury of mice induced by CCl4.[Methods]40 male Kunming mice at four moths old were randomly divided into four groups,which were control group,model group,C. versciclor polysaccharides protection group and feeds + C. versciclor polysaccharides group. Mice were fed for 8 d. On 2 h after final administration,intraperitoneal injection of blend oil solution was carried out was carried out in control group. And in other groups,intraperitoneal injection of0. 15% CCl4 blend oil solution( 10 mL / kg) was conducted. After 18 h,eyeballs were collected and serum was isolated. Livers were taken out and the hepatosomatic index was calculated. Liver homogenate was prepared and the ALT and AST were detected,as well as the SOD and NOS activities,and MDA,GSH and NO contents.[Results] Compared with model group,C. versciclor polysaccharides in different administration ways reduced the hepatosomatic index( P 0. 05) and MDA content( P 0. 001),lowered the AST activity in serum( P 0. 05),the NOS activity and the NO content( P 0. 01),and enhanced the SOD activity and GSH content( P 0. 01).[Conclusions] C. versciclor polysaccharides in different administration ways protected the liver injury of mice induced by CCl4. 相似文献
19.
氮肥形态配比对烤烟中性致香成分含量及产质量的影响 总被引：1，自引：0，他引：1
为明确氮素形态对烟叶品质和经济性状的调控效应,通过田间试验,研究铵态氮和硝态氮配施对烟叶化学成分含量、中性致香成分含量、感官质量及产量的影响。结果表明,铵硝配施显著提高了烟叶还原糖、总糖和钾含量,降低了总植物碱含量。铵硝配施处理的类胡萝卜素类、苯丙氨酸类、棕色化产物类和类西柏烷类致香成分含量低于单施铵态氮处理,与单施硝态氮处理差异较小。新植二烯含量和总中性致香成分含量以单施硝态氮处理最高,铵硝配比为30%:70%的处理次之。烟叶感官质量以铵硝配比为30%:70%的处理最佳,铵硝配比为50%:50%的处理次之。烟叶产值以铵硝配比为50%:50%的处理最高,铵硝配比为30%:70%的处理次之。在本试验条件下,兼顾品质和效益的铵硝配比为30%:70%或50%:50%。 相似文献
20.
Summary Phenolic acid contents were determined in seeds from five buckwheat cultivars grown at three locations in western Canada for four years. Buckwheat contained 12–16 g/kg of total phenolic acids, about 3 g/kg of esterified phenolic acids, and 8–13 g/kg of etherified phenolic acids. The latter represented 70 to 79% of the total phenolics. Variation in phenolic acids was mainly due to cultivar, seasonal effects and their interaction, while growing location had no significant effect. Phenolic acid contents of buckwheat were independent of seed color and protein content. Esterified phenolic acids exhibited a negative significant association with etherified phenolic acids in buckwheat. 相似文献