共查询到18条相似文献,搜索用时 74 毫秒
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研究扶芳藤各极性萃取部位的体外及体内抗氧化作用,为扶芳藤的开发利用提供科学参考。以DPPH法及ABTS法考察扶芳藤各极性部位的体外抗氧化活性;以LPS(1g/L)刺激的小鼠急性肺炎为动物模型,测定血清中超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)活性和丙二醛(MDA)含量,考察各极性部位的体内抗氧化活性。结果显示扶芳藤各极性部位对DPPH自由基都具有清除作用,正丁醇部位、乙酸乙酯部位及石油醚部位的IC50分别为0.103、0.258及0.702 mg/mL;扶芳藤各极性萃取部位对ABTS的产生也都具有抑制作用,正丁醇部位、乙酸乙酯部位及石油醚部位的IC50分别为0.814、2.384及2.059 mg/mL。体内实验结果表明,乙酸乙酯部位和正丁醇部位对改善小鼠体内SOD、MDA和GSH-Px活性有着良好的效果,且与模型组比较有显著性差异P<0.05。证明扶芳藤分离的各萃取极性部位在体内体外均具有不同程度的抗氧化效果,综合考虑以乙酸乙酯和正丁醇提取部位活性为最佳,石油醚部位则活性最差。 相似文献
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扶芳藤种油中的拒食活性化合物的X—射线晶体结构分析 总被引:5,自引:0,他引:5
干燥的带假种皮的扶芳藤种子粉碎后,用石油醚提取,回收石油醚得到种油,将种油用80%乙醇萃取,回收乙醇母液,得到的提出物,上硅胶柱层析,再用石油醚:乙酸乙酯梯度洗脱,收集洗脱液,得到一针状结晶,通过测定其物理常数、红外、质谱及X—射线晶体结构分析,确定其为1α、2α、6β、9α、15—五乙酰基—8α—苯甲酰基—六元二氢沉香呋喃酯。生物活性试验(面积法)结果表明:在1000ppm浓度时,它对害虫黄守瓜的拒食率为58.4%。 相似文献
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盐和水分预处理对扶芳藤幼苗抗寒性的影响 总被引:7,自引:0,他引:7
测定了扶芳藤新品种‘红脉’经不同方式预处理后对幼苗抗寒性的影响,测定了膜脂过氧化水平、保护酶活性和渗透调节物质含量的变化。结果表明,与对照低温胁迫相比,0.1和0.3mol/L NaCl溶液预处理后再经低温胁迫处理,扶芳藤幼苗的膜脂过氧化水平较低、保护酶活性高、渗透调节物质含量的累积较多,不同浓度的NaCl溶液预处理比不同浓度的PEG溶液预处理对提高扶芳藤的抗寒性更有效。通过实验证明了植物在不同的逆境中确实存在着交叉适应现象,植物对各种逆境胁迫有着许多相同的生理反应,对各种胁迫的适应性存在某些共同的机制。 相似文献
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水分胁迫下扶芳藤幼苗保护酶活性和渗透调节物质的变化 总被引:43,自引:0,他引:43
扶芳藤(Euonymus fortunei(Turcz.)Hand.-Mazz)作为北方城市园林的新优攀援藤本和地被植物越来越受到重视,新品系的抗逆性筛选工作迫在眉睫。本文采用聚乙二醇(PEG-6000)模拟水分胁迫的方法,测定其生理指标,研究水分胁迫对扶芳藤不同品系幼苗叶片保护酶活性和渗透调节物质的影响,旨在摸索出这些生理指标与植物抗旱性的关系。研究结果表明,随着模拟干旱时间的延长,扶芳藤幼苗叶片中相对含水量(RWC)逐步下降,保护酶活性上升,脯氨酸和可溶性糖含量急剧上升,并且抗旱性强的品系保护酶活性和渗透调节物质含量较高。 相似文献
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金钟藤叶绿素荧光特征初探 总被引:7,自引:0,他引:7
利用叶绿素荧光技术初步观测丁金钟藤在不同作用光下的光合生理特征,并对其离体叶片在低温、高温及脱水胁迫下的光能利用状况作了比较。结果显示,随着作用光强的增加,叶片Fv'/Fm'、qP和ΦPSⅡ呈下降趋势,qN和NPQ表现为上升。离体叶片在5℃处理6h后,其Fv'/Fm'、qP和ΦPSⅡ高于25℃和45℃处理的,而NPQ在5℃和45℃处理6h后明显低于对照(25℃),qN则略有降低。离体叶片脱水胁迫12h后,仍有一定的光能转化能力,但脱水24h和36h后,qP、ΦPSⅡ、qN、NPQ都明显下降。这表明金钟藤对于环境因子,如光强、温度及水分的变化具有较强的适应性,这可能是其在森林中能快速蔓延扩散的一个重要原因。 相似文献
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Restoring native understory to a woodland invaded by Euonymus fortunei: multiple factors affect success 下载免费PDF全文
Invasive species are capable of causing change in native plant communities, but invasion is often associated with other anthropogenic impacts on natural areas, such as habitat fragmentation and associated dispersal limitation for native species. Consequently, invasive species removal alone may not always be sufficient to meet restoration objectives. We tested if invasion and dispersal limitation interact to limit plant community restoration within a forest fragment invaded by Euonymus fortunei. Removal of Euonymus alone did not lead to the recolonization of native plant species. However, planting seedlings increased total native cover in invaded, Euonymus removal, and uninvaded control treatments. The consistent establishment of native plant seedlings across all treatments indicates that Euonymus invasion may have limited ability to displace established plants. In contrast, plant species that we added as seed were unable to establish in invaded plots, indicating that Euonymus invasion limits recruitment of native plant species from seed. Over the course of our experiment, a number of setbacks and surprises occurred, including high levels of herbivory, a windstorm, and extreme drought, all of which likely limited restoration success. Overall, our results indicate that Euonymus may contribute to native species declines, but other factors are important. Thus, invasive species removal alone may not be sufficient to reestablish a diverse native plant community. Instead, impacts on natural areas may need to be mitigated along with invasive species removal for restoration to be successful. 相似文献
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不同土壤水分条件下小叶扶芳藤叶片光合作用对光的响应 总被引:10,自引:0,他引:10
利用CIRAS-2型便携式光合作用仪测定不同土壤水分下3年生小叶扶芳藤(Euonymus fortunei var.radicans Sieb.)叶片净光合速率(Pn)、蒸腾速率(Tr)、水分利用效率(WUE)及光能利用效率(LUE)等生理参数,阐明其光合生理参数对土壤水分和光照强度的响应规律,探讨小叶扶芳藤正常生长发育所需的土壤水分和光照条件.结果表明小叶扶芳藤的Pn、Tr、WUE及LUE对土壤水分和光照强度的变化具有明显的阈值.(1)采用非直角双曲线模型进行模拟光响应过程较好,在土壤相对含水量(RWC)为72.2%和32.3%时,曲角(K)值较小;在其它水分条件下,K值接近于1.随着土壤水分(RWC为22.4%~72.2%)的递增,光补偿点降低,光饱和点、最大净光合速率及表观量子效率均呈现升高趋势,在RWC为72.2%时,光补偿点最低(22.6 μmol·m-2·s-1),光饱和点最高(1 400μmol·m-2·s-1).(2)维持小叶扶芳藤正常生长(同时具有较高Pn、LUE及WUE)的土壤水分范围,在RWC为44.2%~72.2%之间,最佳土壤水分在RWC为72.2%左右,正常生长所允许的最低土壤水分在RWC为32.3%左右.(3)小叶扶芳藤对光照环境的适应性较强,在光合有效辐射强度为600~1 600 μmol·m-2·s-1范围内,Pn和WUE都具有较高水平,饱和光强大约在800~1 400 μmol·m-2·s-1之间,LUE在100~300 μmol·m-2·s-1光强范围内达到峰值. 相似文献
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北海道黄杨树的组织培养 总被引:5,自引:1,他引:5
1 植物名称 北海道黄杨树 (Euonymusjaponicuscv.Zhuzi) [1 ] 。2 材料类别 成年植株带腋芽的茎段 (caulineseg ment)。3 培养条件 培养基有 :( 1 )MS +NAA 0 .2mg·L- 1 (单位下同 ) + 6 BA 2 .0 ;( 2 )MS +NAA 0 .1 + 6 BA 1 .0 ;( 3)MS +NAA 0 .0 5 + 6 BA 0 .5 ;( 4 )MS +NAA 0 .1 + 6 BA 0 .5 ;( 5 )MS +NAA 0 .1 + 6 BA 1 .0 ;( 6) 1 /2MS +NAA 0 .5 + 6 BA 0 .1。以上培养基含 3%蔗糖、0 .8%琼脂 ,pH 5 .8。培养温度为 ( 2 1±3)℃ ,光照度为 1 5 0 0lx ,光照时间为 1 2h·d- 1 。4 生长与分化情况4.1 无… 相似文献
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The embryogeny of Cryptomeria fortunei was observed. By the middle of March the nucleus of functioning megaspore divides twelve times to form about 3000–4000 free nuclear female gametophyte. Wall formation is centripetal. By the end of May the archegonial complex containing 12–16 archegonia surrounded by jacket layer is present at the micropylar end of the gametophyte. The pollen grains are shed at the uninucleate stage. After pollination the pollen grains swell. The microspore nucleus moves to one side and divides to form a large generative nucleus and a small tube nucleus, The generative cell then divides to form a body cell and a stalk cell. When the pollen tube passed through the nucellus and reached the archegonial complex the nucleus of the body cell divides to form two male cells, generally only one of which enters the arehegonium and the fertilization takes place in the upper part of an egg cell. A number of eggs in an archegonial complex may be fertilized. After the fusion of the male nucleus with the egg nucleus, the zygote divides three times to form eight nuclei, which become organized into primary embryo cells and the open tier. The former are only two or three cells, while the latter has five or six cells open towards the top and divides to form the prosuspensor tier and the upper tier. Thus, the pro-embryo of Cryptomeria belongs to the standard type, according to Doyle (1963). Excepting the simple polyembryony, the cleavage polyembryony is a common character in the embryogeny of Cryptomeria. The mature embryo consists of the radicle, the hypocotyl, the plumule and three cotyledons. When the embryogeny of Cryptomeria fortunei is compared with that of C. japonica, there are many differences obtained. The number of archegonia in the archegonial complex of C. fortunei is less than that of C. japonica. The former does not form the archegonial chamber and the chalazal and lateral archegonia, while the latter does. 相似文献
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北海道黄杨试管快速繁殖技术研究 总被引:1,自引:0,他引:1
以北海道黄杨的茎段为试材、研究其再生植株在不同外源激素配比下的适宜培养基。试验结果表明,北海道黄杨茎段初代培养的培养基以MS培养基附加BA1.5mg/L,NAA0.5mg/L较好。第一次继代培养的培养基以MS培养基(铁盐加倍)附加BA1.5mg/L,NAA0.5mg/L较为合话,第二次及往后的继代培养的培养基以MS培养基(铁盐加倍)附加BA1.0mg/L、IBA0.2mg/L较适宜,并且,随着继代次数的增加,继代苗的分生率提高,生根培养基为1/2MS(铁盐加倍) NAA0.2mg/L及1/2MS(铁盐加倍)移栽时,以蛭石;腐叶土(1:1)为移栽基质,成活率达100%。 相似文献