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1.
以银斑百里香种子为实验材料,研究了不同浓度的萘乙酸(NAA)和2,4二氯苯氧乙酸(2,4-D)与6-苄基氨基嘌呤(6-BA)配合使用对银斑百里香无菌苗生长的影响.结果表明:NAA在0.15 mg/L和2,4-D在0.45 mg/L时是银斑百里香种子萌发成无菌苗的最适宜浓度;MS培养基+ NAA(0.15 mg/L) +6-BA(0.6 mg/L)和MS +2,4-D(0.45 mg/L) +6-BA(0.6 mg/L)的培养基中银斑百里香无菌苗生长最佳.  相似文献   

2.
张波涛  Miao  Jinlai  Ma  Jinhai  Zheng  Zhou  Wang  Guodong  Wang  Quanfu  Li  Guangyou  Liu  Wanshun 《高技术通讯(英文版)》2007,13(1):95-102
Two hundred strains of bacteria from Antarctic sea ice were collected and screened for their ability of producing eieosapentaenoic acid (EPA, 20: 5ω3) by means of Gas Chromatography/Mass Spetmmetry (GC/MS). Eight strains of bacteria containing EPA were investigated, among which the outstanding one was recorded as NJ136. This bacterium was identified as Shewanella by the biochemical characteristics and 16S rRNA sequence. Response surface methodology (RSM) was applied to optimize the medium ingredients. A 24 full factorial central composite design (FFCCD) was employed to determine the naximum EPA production at optimum levels of pH, NaC1, glucose and yeast extract. The predicted optimal combination of media constituents for maximum 14.02 mg/g ( about 1.7-fold increase) EPA production were determined as 30.15%e (m/v) NaC1, 9.98 g/L glucose, 4.42 g/L yeast extract and pH 6.08. The actual experimental results were in agreement with the prediction.  相似文献   

3.
为探讨马缨丹(Lantana camara L.)应用于植物修复的可行性,通过盆栽试验,研究了马缨丹对土壤中重金属镉(Cd)的耐性,以及不同施Cd水平下丛枝菌根真菌(Arbuscular Mycorrhizal Fungi,AMF)Glomus intraradices(GI)对马缨丹吸收和转运Cd的影响. 结果显示:当土壤Cd含量为50 mg/kg时,马缨丹的生长受到明显的抑制作用;当土壤Cd含量为10 mg/kg时,马缨丹地上部具有较高的Cd积累量. GI表现出对Cd较强的耐性,能较好地侵染马缨丹根系. 与对照相比,接种GI能缓解Cd对马缨丹的生物毒性效应,显著提高马缨丹的生物量(P<0.05);接种GI对马缨丹转运Cd没有显著影响(P>0.05),但当土壤Cd含量为100 mg/kg时,接种GI会抑制马缨丹对Cd的富集. 结果表明马缨丹对Cd具有较强的耐受性,在低Cd污染土壤中具有较高的提取效率;接种GI显著提高了马缨丹对Cd的耐性和地上部Cd的提取量(P<0.05),表明马缨丹在修复Cd污染土壤方面具有应用潜力.  相似文献   

4.
The eco-physiological response and adaptation of Populus euphratica Oliv and Tamarix ramosissima Ldb during water release period were investigated. Nine typical 'areas and forty-five transects were selected along the lower reaches of Tarim River. The groundwater table as well as plant performance and the contents of proline, soluble sugars, and plant endogenous hormone (ABA, CTK) in leaves were monitored and analyzed. The groundwater table was raised in different areas and transects by water release program. The physiological stress to P. euphratica and T. ramosissima had been reduced after water release. Our results suggested that the groundwater table in the studied region remained at -3.15 to -4.12 m, theproline content from 9.28 to 11.06 (mmol/L), the soluble sugar content from 224.71 to 252.16 (mmol/L), the ABA content from 3.59 to 5.01 (ng/g FW), and the CK content from 4.01 to 4.56 (ng/g FW), for the optimum growth and restoration of P. euphratica indicated by the plant performance parameters and the efficiency of water application was the highest. The groundwater table in the studied region remained at -2.16 to -3.38 m, the proline content from 12.15 to 14.17 (mmol/L), the soluble sugar content from 154.71 to 183.16 (mmol/ L), the ABA content from 2.78 to 4.86 (ng/g FW), and the CK content from 3.78 to 4.22 (ng/g FW), for the optimum growth and restoration of T. ramosissima indicated by the plant performance parameters and the efficiency of water application was the highest. The rational groundwater table for the restoration of vegetation in the studied region was at -3.15 to -3.38 m.  相似文献   

5.
西葫芦子叶花芽分化时内源激素、多胺含量的变化   总被引:7,自引:0,他引:7  
西葫芦子叶于附加1.0mg/L KT(激动素)MS(Murashige,Skoog)培养基中培养,明显提高了子叶的花芽分化率,分析其内源激素,多胺含量 态变化,发现经KT处理组的子叶在花芽分化时,其内源GA1/3(赤霉素)含量降低,而ZRs(玉米核苷)含量显著增加,表现出高的ZRs/GA1/3 比值,花芽分化时,子叶内源Spm(精胺),Spd(亚精胺)含量剧增,其中经KT处理组的子叶,其内源Spd含量较对照组增加2倍多,而Put(腐胺)含量在萌生不定根和营养芽时急剧增加,但到花芽分化时又突然下降,表明内源ZRs,Spd含量高与ZRs/GA1/3比值高有利于西葫芦子叶花芽分化。  相似文献   

6.
植物寄生线虫(Plant parasitic nematodes)对农林业生产造成了巨大的经济损失,为减少环境污染,发展绿色农业,生物防治愈发受到关注。Bt菌(Bacillus thuringiensis, Bt)作为一种重要的生防细菌,对鳞翅目、鞘翅目、双翅目和线虫具有特异性的杀虫活性,对人类和非靶标昆虫无害。文章对已报道的Bt菌及其杀植物线虫Cry蛋白种类、结构特征和杀虫机制等方面研究进展进行了简要综述。  相似文献   

7.
不同植物净化灵剑溪受污水体的研究   总被引:2,自引:0,他引:2  
元土栽培桂林市灵剑溪的优势物种海芋(Alocasia macrorrhiza)、水花生(Alternanthera philoxeroides)及其它9种花卉植物:小黄菊(Pyrethrum pulchrum Ledeb)、吊兰(Chlorophytum comosum)、八仙花(Hydrangea macrophylla(Thunb.)Ser.)、富贵竹(Disporum cantoniense)、小天使(Philodendron pittieri)、水竹(Phyllostachy sheteroclada Oliver)、春羽(Phildendron sellomn)、鹅掌柴(Schefflera octophylla)、栀子花(Gardeniaja sminoides Ellis)等,进行净化桂林市灵剑溪富营养化水体的静态试验。结果表明,除小黄菊、吊兰、八仙花外,其他受试植物在水中均能正常生长、对水体均具有明显的净化效果,可以作为人工湿地生态系统选种植物,可以达到净化污水和美化环境双重功能。研究结果为发展利用花卉植物治理富营养化水体提供了依据。  相似文献   

8.
高霞 《青海大学学报》2007,25(5):47-48,61
用3种植物生长调节剂对剑兰继代培养中芽形成的影响进行了研究。结果表明:植物生长调节剂对继代芽的增殖有较大的影响,多效唑(PP333)和烯效唑(S3307)分别单独使用时,能显著促进芽增殖的浓度均为2.0 mg/L,而水杨酸(SA)在使用浓度为0.5 mg/L时,对剑兰继代芽增殖具有促进作用。  相似文献   

9.
为了探究高盐、高CODcr (重铬酸盐法化学需氧量)、高氨氮采出水生化处理的关键功能菌群及代谢机理,本研究在生产规模缺氧/好氧池-膜生物反应池(anoxic / oxic pond - membrane bioreactor,A/O-MBR),使用Illumina Miseq高通量测序和实时荧光定量多聚核苷酸链式反应(real-time quantitative polymerase chain reaction,qPCR)方法,检测了细菌、氨氧化细菌(ammonia oxidizing bacteria,AOB)和氨氧化古菌(ammonia oxidizing archaea,AOA)的组成和含量。A/O-MBR 出水分析结果显示CODcr平均211 mg/L,去除率72.7%;氨氮分为低/高去除率(LS/HS)两个阶段,去除率分别为5.7%和70.8%。氨氮全部氧化为亚硝酸根;但亚硝酸根没有进一步转化为硝酸根,而是部分通过反硝化转化为氮气。细菌组成揭示关键功能菌群:涉及CODcr去除的主要有林杆菌(Limnobacter)、陶厄氏菌(Thauera)、伯克氏菌(Burkholderia)、水微菌(Aquamicrobium)、藤黄单胞菌(Luteimonas)、砂单胞菌 (Arenimonas),涉及反硝化的主要有斯塔普氏菌(Stappia)、生丝微菌(Hyphomicrobium)和噬甲基菌 (Methylophaga)。AOB优势菌是亚硝化单胞菌 (Nitrosomonas),占比高达96.6%。AOA主要有亚硝化球菌(Nitrososphaera)、亚硝化短小杆菌 (Nitrosopumilus)和Nitrosocosmicus,均率属于奇古菌门(Thaumarchaeota)。LS和HS样品细菌含量范围2.83×10^9~4.01×10^9 拷贝/g污泥,细菌丰富是高效生化处理的基础;AOB含量分别是7.27×10^7~8.47×10^7 拷贝/g污泥和6.79×10^8~17.2×10^8 拷贝/g污泥,差异显著,是氨氮去除率差异的决定因素;AOA含量范围4.06×10^4~8.88×10^4 拷贝/g污泥,均极低,揭示其不是氨氮去除的关键菌群。这些发现可为提高含硫气田高含盐采出水处理效率和稳定性奠定基础。  相似文献   

10.
以大花组的束花石斛(Dendrobium chrysanthum)和黄花石斛(D. dixanthum)为材料,对它们的光合生理等进行了系统研究.2种石斛叶片的解剖结构为异面叶,气孔仅分布在下表面,具气孔盖,叶脉维管束鞘不含叶绿体,无花环型结.2种石斛的光强、CO2浓度和温度的响应研究表明,它们的光补偿点(LCP)和光饱和点(LSP)分别为5~10μmol/(m2?s) 和850~900μmol/(m2?s),最大光合速率(Pn)在~6μmol/(m2?s);CO2补偿点和饱和点分别为80~90 μmol/mol和800 μmol/mol;光合作用的最适温度在26~30℃.2种石斛兰的Pn日变化为双峰型曲线,首峰出现在12:00左右,最大光合速率在5~6μmol/(m2?s),次峰出现在15:00左右,夜间不吸收CO2.2种石斛的PEPCase活性极低,具有较高的RuBPCase和GO酶活性.以上的研究结果表明,束花石斛和黄花石斛光合作用碳同化途径属C3植物类型,具有半阴生植物的特点.  相似文献   

11.
“桂植捕线菌七号”(CN.7),属烛台霉属(Candelabrellasp.),是一个具有捕捉环的肉食真菌,没有专化性.特点有三:1)对土壤线虫具有稳定的捕捉势和较强的捕食能力;捕食线虫的相对效果达70%以上,对寄主植物根系的保护效果更佳。2)能产生抗菌素,对植物的某些病害有兼防效果,其中对烟草青枯病(Pseudomonassolanacearum)防效达60%左右。3)对寄主植物有促进生长、改良品质的效果,其中对烟草至少可增产10%以上,烟叶的等级也有所提高。  相似文献   

12.
为了保持高效菌株的降解活力。运用单因素分析和正交试验。对一株优势降酚菌GPS-1的生长条件进行了较为系统的研究。单因素分析结果表明,GPS-1菌株的活性范围是:温度(20~40)℃,pH(5.0-9.0),外加碳源(葡萄糖)浓度(0-1000)mg/L,盐浓度(0-8)g/L;考虑动力消耗,溶解氧(摇床转速)应为180r/min。由正交试验可知:温度是影响GPS-1菌株生长的最主要因素,pH值和外加碳源浓度的影响接近,且明显小于温度的影响;得到的菌株最佳生长条件为:温度30℃,酸度值为pH7.0,外加碳源浓度1000mg/L。这一实验为工业处理含酚废水提供了较为可靠的运行参数。  相似文献   

13.
兰武 《科技资讯》2010,(20):212-213
本试验以露地栽培的"丰香"草莓为材料,在初花期、盛花期和座果期喷施赤霉素(GA3)15mg/kg、吡效隆(CPPU)40mg/kg、胺鲜酯(DA-6)20mg/kg、芸苔素内酯0.06mg/kg、赤霉素.芸苔素复配剂2000×进行喷叶、喷花和喷果处理,三次重复,以清水为对照,研究不同的植物生长调节剂对草莓产量、品质的影响。结果表明:5种不同植物生长调节剂处理均显著提高了草莓的产量。CPPU处理降低了果实可溶性固形物、可溶性糖、Vc的含量和糖酸比,使草莓内在的品质有所下降,其余4个品种均能显著提高草莓的营养物质比例,改善了草莓品质,提高了草莓商品率。  相似文献   

14.
报道了湖南植物分布新纪录属1个:毛核木属(Symphoricarpos Duham.).新纪录种11个:小冻绿树(Rhamnus rosthornii);华中乌蔹莓(Cayratia oligocarpa);秦岭槭(Acer tsinglingense);四川槭(A.sutchuenense);小花梾木(Swida parviflora);拟密花树(Rapanea affinis (A.DC.) Mez);野迎春(Jasminum mesnyi);长叶女贞(Ligustrum compactum);峨嵋牛皮消(Cynanchum giraldii);淡黄荚蒾(Viburnum lutescens);毛核木(Symphoricarpos sinensis).变种3个:狭叶短毛独活(Heracleum moellendorffii var.subbipinnatum);七裂薄叶槭(A.tenellum var.septemlobum);秀山金萼杜鹃(Rhododendron chrysocalyx var.xiushanense).新纪录亚种2个:多花清风藤(Sabia schumanniana subsp.pluriflora);亮叶忍冬(Lonicera ligustrina subsp.yunnanensis).新纪录植物隶属11科,14属.  相似文献   

15.
Na+/H+ antiporters have been well documented to enhance plant salt tolerance by regulating cellular ion homeostasis. Here, a putative Na+/H+ antiporter gene homolog GmNHX2 from soybean was cloned and predicted to encode a protein of 534 amino acids with 10 putative transmembrane domains. GmNHX2 was expressed in all soybean plant tissues but enriched in roots and its expression was induced by NaCI and polyethylene glycol (PEG) treatments. GmNHX2 exhibits greater sequence similarity with LeNHX2 and AtNHX6 than that of AtNHX1 and AtSOS1. Although phylogenetic analysis clustered GmNHX2 with organellar (tonoplast and vesicles) antiporters, the GmNHX2-EGFP (enhanced green fluorescent protein) fusion protein was possibly localized in the plasma membrane or organelle membrane of transgenic plant cells, Furthermore, transgenic Arabidopsis plants expressing GmNHX2 were more tolerant to high NaCl concentrations during germination and seedling stages when compared with wild-type plants. These results suggest that GmNHX2 is a membrane Na+/H+ antiporter and may function to regulate ion homeostasis under salt stress.  相似文献   

16.
Enhancement of cell growth in suspension cultures is urgently needed in plant cell culture engineering. This study investigates the relationship between morphological transformation and cell growth in callus and suspension cultures of saffron cells belonging to the cell line C96 induced from Crocus safivus L In the suspension culture, an unbalanced osmotic pressure between the intracell and extracell regions induced a large morphological transformation which affected normal division of the saffron cells. An increase in osmotic pressure caused by the addition of sucrose inhibits the vacuolation and shrinkage of cytoplasm in the cells. As the sucrose concentration increases, the total amount of accumulated biomass also increases. Besides the sucrose concentration, increased ionic strength and inoculation ratio also help restrain to a large extent the vacuolation and shrinkage of the cytoplasm in the suspended cells, which results in increased biomass. The conditions for optimal biomass are: Murashige and Skoog's (MS) medium with 40 g/L sucrose and 60% (v/v) inoculation ratio.  相似文献   

17.
根据文献资料,植物标本采集记录和走访老一辈植物学家,对钟观光先生一生的植物采集活动进行了考证。他的最早采集年限不迟于1905年,从1905年至1936年共采集植物标本约2.5万号。为纪念钟观光先生,以其名命名的有观光木属(Tsoongiodendron)和钟木属(Tsoongia)两个新属,其他新植物类群达50个。钟先生既是我国用近代植物分类学方法研究和采集植物的第一人,也是我国第一个植物标本室(北京大学植物标本室)和第一个近代植物园(笕桥植物园)的创建者,在我国近代植物学发展史上写下了重要的一页。  相似文献   

18.
河北省藓类植物新记录及其地理分布   总被引:4,自引:4,他引:0  
首次报道9种河北省藓类植物新记录:(1)深色红叶藓(Bryoerythrophyllumatrorubens),(2)纽藓(Tortellahumilis),(3)树生墙藓(Tortulalaevipila),(4)短尖叶墙藓(Tortulaschmidii),(5)拟阔叶小石藓(Weisiaplatyphylloides),(6)齿边缩叶藓(Ptychomitriumdentatum),(7)狭叶缩叶藓(Ptychomitriumlinearifolium),(8)卷叶紫萼藓(Grimmiaincurva),(9)厚边紫萼藓(Grimmiaunicolor),并对它们的认别特征做了简要讨论.  相似文献   

19.
报道湖南植物分布新纪录属1个,即鞭打绣球属Hemiphragma Less.;新纪录种13个,即光叶党参(Codonopsis cardiophylla Diels ex Kom.)、多毛沙参(Adenophora rupincola Hemsl.)、车前紫草(Sinojohnstonia plantaginea Hu)、湖北附地菜(Trigonotis mollis Hemsl.)、广西地海椒(Physaliastrum chamaesarachoides (Makino) Makino)、青杞(Solanum septemlobum Bunge)、美穗草(Veronicastrum brunonianum (Benth.) D. Y. Hong)、岩白翠(Mazus omeiensis H. L. Li)、鞭打绣球(Hemiphragma heterophyllum Wall.)、藓生马先蒿(Pedicularis muscicola Maxim.)、野芝麻马蓝(Pteracanthus lamius (C. B. Clarke ex W. W. Smith) C. Y. Wu et C. C. Hu)、日本黄猄草(Championella japonica (Thunb.) Bremek.)、紫苞野靛棵(Mananthes latiflora (Hemsl.) C. Y. Wu et C. C. Hu)、莸(Caryopteris divaricata Maxim.),隶属6科,13属.  相似文献   

20.
为探讨受试菌菌悬液浓度对体外药敏实验结果的影响,该文采用微量稀释法测定阿莫西林/克拉维酸(4:1)、庆大霉素、多西环素和恩诺沙星等4种药物对鸡大肠杆菌和鸡金黄色葡萄球菌在不同菌悬液浓度(10^3CFU/mL、10^4CFU/mL、10^5CFU/mL、10^6CFU/mL、10^7CFU/mL)的最小抑菌浓度(MIC)值。结果表明:恩诺沙星对两类细菌的MIC值不受接种的菌悬液浓度影响;多西环素对大肠杆菌的MIC值受菌悬液浓度影响较小,但其对金黄色葡萄球菌的MIC值随菌悬液浓度升高而升高;阿莫西林/克拉维酸(2:1)和阿米卡星对两类菌株的MIC值均随菌悬液浓度增大而增大,增大的幅度因药物和受试菌不同而异。  相似文献   

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