排序方式： 共有77条查询结果，搜索用时 15 毫秒
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在温室沙培条件下,研究了不同浓度外源NO供体硝普钠(SNP)对50 mmol L-1NaCl胁迫下长春花幼苗生长、光合特性和生物碱的影响。结果表明:(1)在用0.05～2.0 mmol L-1 SNP缓解50 mmol L-1NaCl胁迫中,0.1mmol L-1 SNP缓解效果最好,长春花幼苗的鲜重、干重、净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)和过氧化物酶(POD)活性分别较S1(50 mmol L-1NaCl)处理显著增加18.8%、13.9%、20.7%、19.1%、8.5%和32.6%,而细胞间隙CO2浓度(Ci)较S1处理显著降低10.3%。(2)当SNP浓度增加到0.5mmol L-1时,色氨酸脱羧酶(TDC)活性、吲哚总碱、长春碱、长春质碱、长春新碱和文多灵含量均达到最高,分别较S1显著增加33.4%、26.9%、32.3%、27.4%、68.8%和50.2%。综上所述:在50 mmol L-1NaCl胁迫下,0.1 mmol L-1SNP对提高光合作用,促进生长,增加生物量的作用最显著;而0.5 mmol L-1 SNP则对提高TDC活性,促进吲哚总碱和4种主要生物碱合成积累作用最显著。 相似文献
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The primary objective of this study is to evaluate the antitussive, expectorant and anti-inflammatory effects of alkaloids imperialine (I), chuanbeinone (II), verticinone (III), and verticine (IV), which were isolated from the Bulbus Fritillariae Cirrhosae (BFC) using phytochemical method. The results showed that all the alkaloids significantly inhibited cough frequency and increased latent period of cough in mice induced by ammonia. Besides, imperialine(I), verticinone(III) and verticine(IV) markedly enhanced mice's tracheal phenol red output in expectorant evaluation, and imperialine(I), chuanbeinone(II) significantly inhibited the development of ear edema in a dose-dependent manner in anti-inflammatory assessment. Moreover, important differences were found among the structure–activity relationships for the four alkaloids. These results confirmed that the four alkaloids imperialine, chuanbeinone, verticinone and verticine may be the active ingredients of the Bulbus F. Cirrhosae (BFC). 相似文献
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Kacem Rharrabe 《Pesticide biochemistry and physiology》2007,89(2):137-145
We have investigated the effects of harmaline, a plant secondary metabolic compound belonging to β-carboline alkaloids, on the 4th instar larvae of Plodia interpunctella (Lepidoptera). When incorporated into the diet, harmaline caused weight loss of larvae with a reduction in protein and glycogen contents and an inhibition of α-amylase activity. Using electron microscopy, we showed that harmaline provoked a severe cytotoxicity on the epithelial cells of the midgut resulting in marked vacuolization of the cytoplasm, appearance of numerous autophagic vesicles and lysosomic structures, fragmentation of rough endoplasmic reticulum cisternae, disruption of microvilli, rupture of the plasma membrane leading to shedding of the cytoplasm contents into the midgut lumen. The development of larvae to the pupal and adult stages was prevented and high mortality was recorded. 相似文献
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采用试管法和圆形滤纸层析法,鉴定了山莓叶的化学成分,结果表明其含有生物碱、有机酸、黄酮及其甙类、多糖、香豆素及内酯,酚性成分、鞣质、多肽及蛋白质、皂甙、三帖类、蒽醌、强心苷等多种物质。采用有机溶剂提取法分离提取其抗菌有效成分-生物碱,并用其对几种兽医临床常见病原微生物进行体外抑菌试验,结果表明：山莓叶所含总生物碱对金色葡萄球菌、猪巴氏杆菌、大肠杆菌、链球菌和沙门氏菌都有明显的抑菌作用,最低抑菌浓度分别为：0．125g／mL,0．25g／mL,0．125g／mL,0．5g／mL,0．125g／mL。 相似文献
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白肋烟自然群体和纯化群体生物碱的关系 总被引：2，自引：0，他引：2
以白肋烟主栽品种达白1号和鄂烟1号为材料, 探索自然群体和去除烟碱转化株后的纯化群体混合样品和单株样品生物碱含量及相互关系。结果表明, 在纯化群体中烟碱含量一般占总生物碱的92%~95%, 新烟草碱含量高于降烟碱含量居第2位, 含量比例分别为3.2%~5.0%和1.6%~2.8%, 假木贼碱含量和比例最低。在含有大量转化株的自然群体中烟碱含量降低, 降烟碱含量增高, 降烟碱含量高于新烟草碱。纯化群体中, 随着单株总生物碱含量的增加, 各生物碱含量均表现直线增加, 其相关系数由高到低依次为烟碱、新烟草碱、假木贼碱、降烟碱, 增长直线的斜率由高到低依次为烟碱、新烟草碱、降烟碱、假木贼碱。在自然群体中, 总生物碱与烟碱和降烟碱的相关性减小, 与新烟草碱和假木贼碱的相关性没有变化。在纯化群体中烟碱与降烟碱含量呈正相关, 但在自然群体中二者呈负相关或无相关。新烟草碱与假木贼碱在两个群体中均显著正相关。 相似文献
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采用微波法提取魔芋中总生物碱,探讨微波提取工艺的影响因素,以单因素和正交实验确定最佳提取条件。结果表明,乙醇浓度95%,微波浸提时间12 min,温度70℃,料液比1∶5时,总生物碱提取率最高。 相似文献
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利用粳稻02428突变体的RIL群体336个F9家系,对糙米中总黄酮和生物碱等2种功能活性成分含量的变异及其与主要农艺性状的相关性进行分析.结果表明,①2种功能活性成分在F9家系间均有较大的变异,其中生物碱含量变异最大,总黄酮变异最小,变异系数分别为55.87％和22.67％.②剑叶宽与总黄酮含量(0.135**)、结实率与生物碱含量(0.130**)呈极显著相关;穗下节长与总黄酮含量(0.127*)、秕粒数与生物碱含量(-0.125*)呈显著相关.③剑叶宽、穗下节长与总黄酮含量、秕粒数与生物碱含量的相关关系主要是直接效应,直接通径系数分别为0.129,0.250和-0.298;结实率与生物碱含量的相关主要是通过株高、剑叶长宽、穗颈长、穗下节长、1～2节长、穗长、实粒数、秕粒数的间接作用,说明剑叶宽、穗下节长、秕粒数和结实率可作为高含量总黄酮、生物碱水稻品种选育的重要参考指标. 相似文献
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