苎麻韧皮纤维超微结构的观察     

晏春耕  曹瑞芳  申素芳  孔振兰  周向华 《安徽农业科学》2012,40(8):4488-4489,4491

[目的]研究苎麻(Boehmeria nivea L.Guad)韧皮纤维的超微结构。[方法]对苎麻茎韧皮纤维进行光学显微镜和透射电子显微镜观察;并对苎麻单纤维进行组织离解,用光学显微镜进行观察。茎韧皮纤维显微观察结果表明:苎麻韧皮纤维细胞壁横切面分为胞间层、初生壁和次生壁3个层次和细胞腔;次生壁大多为1层,即次生壁外层(S1),并且具有许多同心层次;少数纤维具有2～3层,即次生壁外层、中层(S2)和内层(S3);茎基部纤维次生壁多为2～3层,中部纤维次生壁多为1层,苎麻纤维次生壁层次存在位置差异;苎麻纤维是由若干个纤维细胞相互连接而成,纤维细胞之间部分纤维细胞端壁溶解,部分具细胞膜和初生壁,部分具次生壁。苎麻单纤维光学显微镜结果表明:苎麻单纤维细丝状,纤维细胞壁(次生壁)由Z型微纤丝和S型微纤丝组成,具节和节间,少数纤维具有明显的节状加厚现象;中央略大,两端尖削,或钝圆形、二叉状、火炬状等各种形状。[结论]该研究可为生产高品质的苎麻产品奠定基础。  相似文献   

Effect of pre-harvest application of calcium and boron on dietary fibre,hydrolases and ultrastructure in ‘Cara Cara’ navel orange (Citrus sinensis L. Osbeck) fruit     

Tao Dong  Renxue Xia  Zhiyan Xiao  Peng Wang  Wenhua Song 《Scientia Horticulturae》2009

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The effect of partial liquid ventilation on the ultrastructure of pulmonary surfactant system in endotoxin-induced acute lung injury in rats     

DENG Xiao-ming  LI Jin-bao  ZHU Ke-ming 《园艺学报》2000,16(8):734-737

AIM: To study the effect of partial liquid ventilation on the ultrastructure of pulmonary surfactant(PS) system in endotoxin-induced acute lung injury. METHODS: The effect of partial liquid ventilation on the ultrastructure of PS system in endotoxin-induced acute lung injury was observed with electronmicroscope histochemistry. RESULTS: There was ultrastructure impairment of PS system in endotoxin-induced acute lung injury, the pulmonary surfactant layer was discontinuous, lamellar bodies and plasmosomes in type Ⅱ pneumonocytes vacuolated, and a few of them were even necrotized and disrupted into the alveolar space. The pulmonary surfactant layer was still continuous, the vacuolation of lamellar bodies and plasmosomes in type Ⅱ pneumonocytes was little with partial liquid ventilation. CONCLUSION: Partial liquid ventilation can lessen the impairment of PS system in endotoxin-induced acute lung injury in rats.  相似文献   

遮荫对生姜叶片显微结构及叶绿体超微结构的影响   总被引：30，自引：2，他引：28  

张振贤  郭延奎  邹琦 《园艺学报》1999,26(2):96-100

生姜叶片的比叶重，厚度，细胞和叶绿体大小及其数据随生育期的进展有变小或减少的趋势，但叶绿体的比基粒片层数，淀粉粒数则呈增加趋势。遮荫可使生姜叶片的ＳＬＷ，厚度，细胞和叶绿大小及其数量呈变小或减少的趋势，而遮荫后叶绿体的基粒生层，比基粒片层，淀粉粒则呈较大幅度的增加。这些变化可能是生姜对光强度变化适应的结果。  相似文献   

琯溪蜜柚汁胞粒化原因分析   总被引：18，自引：0，他引：18  

潘东明  郑国华  陈桂信  佘文琴  郭志雄  施木田  林慧颖 《果树学报》1999,16(3):202-209

观测分析了溪蜜袖汁胞的粒化过程、症状及若于相关因素。结果表明,汁胞粒化现象在果实生长后期（9月中下旬）开始出现,与果实正常种子数的有无与多寡有关。扫描电镜和透射电镜观察,发现汁胞的粒化是从顶端开始,外表横纹的消失是重要的外表特征;粒化汁胞细胞壁加厚,纤维、半纤维增多,高尔基体增加,核体积增大。并首次观察到粒化汁胞的细胞多核仁现象。  相似文献   

Cell interactions between a nonpathogenic <Emphasis Type="Italic">Fusarium oxysporum</Emphasis> strain and root tissues of <Emphasis Type="Italic">Eucalyptus viminalis</Emphasis>     

Maria-Isabel?Salerno  Silvio?Gianinazzi  Christine?Arnould  Vivienne?Gianinazzi-PearsonEmail author 《Journal of General Plant Pathology》2004,70(3):153-158

Nonpathogenic isolates of Fusarium oxysporum can be successful antagonists of pathogenic forms of the same fungal species that commonly attacks crop plants. The characteristics that distinguish nonpathogenic from pathogenic forms are not well understood. In this study, the mode of root colonization of Eucalyptus viminalis seedlings by a nonpathogenic F. oxysporum strain is described at the ultrastructural level. Root systems of E. viminalis plants were inoculated with nonpathogenic F. oxysporum strain Fo47 in an in vitro model system. Changes in the occurrence of nonesterified and methyl-esterified pectins in colonized E. viminalis roots were evaluated by in situ immunolabeling using two monoclonal antibodies, JIM 5 and JIM 7. Modes of penetration and root colonization patterns in E. viminalis seedlings by the nonpathogenic fungus were similar to those described for pathogenic forms of F. oxysporum. However, root interactions differed in that the nonpathogenic fungus did not induce host tissue damage. No papilla-like appositions were observed in host cells in response to invading hyphae, which did not disrupt the host plasma membrane in many cases, suggesting that a biotrophic relationship was established. Root colonization by the nonpathogenic strain did not induce alteration in JIM 7 labeling of methyl-esterified pectin in E. viminalis cell walls, whereas nonesterified pectin was detected to a significantly greater extent in cell walls of roots colonized by the fungus. Pectin components decreased slightly only at points of hyphal contact with host cells. Because nonpathogenic strains utilize pectin in pure culture, host control over enzyme activity or production by the fungi may at least partly explain their compatible interactions with host tissues.  相似文献   

比格犬脑垂体远侧部细胞的电镜观察   总被引：1，自引：0，他引：1  

李玉谷  张媛  孔小明  程树军  黄韧 《畜牧兽医学报》2003,34(5):468-470

透射电镜观察表明,比格犬(Beagle)脑垂体远侧部实质中含有6种细胞,即生长激素细胞、催乳激素细胞、促甲状腺激素细胞、促性腺激素细胞、促肾上腺皮质激素细胞和滤泡—星形细胞,它们各有其超微结构特征。生长激素细胞呈圆形;胞核为圆形;分泌颗粒很多,圆形,直径约233～465nm,催乳激素细胞多呈不规则形;胞核为不规则形;分泌颗粒很多,圆形,直径约310～620nm。促甲状腺激素细胞呈圆形或卵圆形;胞核为圆形或卵圆形;分泌颗粒较少,直径约78～232nm。促肾上腺皮质激素细胞呈圆形或卵圆形;胞核为圆形或卵圆形;分泌颗粒较多,圆形,直径约155～310nm,分布于细胞周边。促性腺激素细胞呈圆形或椭圆形;胞核为圆形或椭圆形;分泌颗粒较少,呈圆形、卵圆形、杵状或不规则形,长径约155～434nm。滤泡—星形细胞呈星形或不规则形,有突起伸入相邻细胞之间;胞核为圆形或卵圆形;胞质内无分泌颗粒。  相似文献   

黄皮耐贮性与果皮超微结构的研究   总被引：8，自引：1，他引：8  

屈红霞  蒋跃明  李月标  林文彬  彭丽桃  胡晓颖 《果树学报》2004,21(2):153-157

以大鸡心、小鸡心、圆种3个黄皮品种为材料,探讨了常温(28～33℃)贮藏3个黄皮品种耐贮性与果皮超微结构的差异。结果表明,圆种黄皮最耐贮藏,小鸡心次之,大鸡心耐贮性最差。经扫描电镜观察,黄皮外表皮薄,只有2～3层细胞构成。外表皮结构疏松,外表面有小裂隙,外被一层均匀的蜡质,密布表皮毛和气孔,果实分泌物中有结晶状物。新鲜采收黄皮果皮中即有病原微生物潜伏,随贮藏时间延长,黄皮果外表皮病原物大量繁殖,表皮毛与蜡质层脱落,气孔也逐渐闭合。3个品种黄皮外表皮的其它特征,如表面皱折大小与数量、表皮毛和气孔的密度、形状和大小等有明显差异。  相似文献   

热胁迫对番茄叶肉细胞叶绿体超微结构的影响   总被引：7，自引：2，他引：7  

王冬梅  许向阳  李景富  崔琳 《园艺学报》2004,34(6):820-821

 以番茄耐热品种‘02276’和感热品种‘L402’为试材, 观察其在高温下叶绿体的变化情况。结果表明, 高温胁迫破坏番茄叶肉细胞叶绿体被膜和类囊体系统正常的超微结构特征, 并且耐热性不同的番茄品种之间存在明显差异。高温胁迫下叶绿体的形态变化可以作为在细胞水平上评价番茄耐热性的重要指标。  相似文献   

环磷酰胺脱毛剂对羊毛生长和毛囊发育影响的超微结构观察   总被引：2，自引：0，他引：2  

陈卫  郭晓慧 《畜牧兽医学报》1998,29(5):426-430

环磷酰胺是癌症治疗药物,也可用作化学脱毛剂。新疆细毛羊注射环磷酰胺６￣８ｄ后开始脱毛,１５ｄ后全部脱落。本文用透射电子显微镜观察了注射环磷酰胺脱毛剂前后毛囊细胞超微结构的变化,并初步探讨了脱毛作用的机理。  相似文献