共查询到19条相似文献,搜索用时 156 毫秒
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南洋楹丛枝病的病原为类菌原体(MLO),存在筛管细胞内,MLO形态多为圆形、椭圆形,乃至不规则形。大小直径为120—500um,单位膜厚度6.5—8.0nm。病组织经Dience’s液染色后,筛管细胞不规则地染成深蓝色,健康组织不着色。病株经四环素或土霉素处理后,效果较为明显,症状减退或消失。 相似文献
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以感染类菌原体MLO的泡桐组培苗为病原繁殖材料,采用差速离心和Percoll不连续密度梯度离心来提纯MLO作为免疫抗原制备兔抗血清。抗血清经健康汁液吸收后,作为第一抗体,用异硫代氰酸荧光素FIFC标记的羊抗兔免疫球蛋白作为第二抗体,进行间接免疫荧光显微镜检查染病组织中的MLO特异性荧光。经与DAPI染色技术比较,找出了适宜的徒手切片和减少非特异性反应的途径。此技术具有灵敏度高、特异性强和测定简便等特点。适用于MLO组织定位、组培苗脱毒效果评估、病原株系鉴定和病害检疫等。 相似文献
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自1967年发现植物类菌原体MLO(Mycoplasma-like organisms)以来,迄今世界各国已发现300余种,我国已鉴定70余种植物MLO和类细菌(BLO)病害。作者收集鉴定了其中18种林木MLO、和BLO病害。本文汇总了国内已报道的林木及果树等木本植物MLO、BLO 38种及其发生地、寄主媒介昆虫,就世界范围而言,占已发现木本植物类菌原体比例最大,对我国类菌原体学的研究有着积极的意义。 相似文献
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海南岛树木资源(续1)黄世满,谢国干(海南大学)被子植物亚门ANGIOSPERMAE双子叶植物纲DICOTYLEDONKAE木兰科MAGNOLIACEAE※○绢毛木兰(MagonoliaalbosericeaChunetCTsoong),梭叶(琼)。... 相似文献
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被于植物亚门ANGIOSPERMAE双子叶植物纲DICOTYLEDONEAE杜英科ELAEOCANPACEAE水石榕(Elaeocarpus hainanensis Oliv);海南杜英,水柳树(琼);屯昌,本岛常见。锡兰杜英(E eserrstusLinn.);锡兰橄榄。屯昌,本岛少见。尖叶杜英(E aplculatus Masters)H(40),D(80)。尖峰,本岛南半部林区少见。皮灰褐;心材紫褐,;边材黄灰,生长轮隐约可见;材中等重略硬,d(0.64),易加工,不耐腐。供家具、一般建筑… 相似文献
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By polymerase chain reaction, mycoplasmalike organisms (MLOs) were detected in several declining trees of Quercus robur sampled at two locations of Germany. The MLOs associated with declining oaks were, within the 16S rDNA studied, genetically uniform and closely related to the MLOs associated with European stone fruit yellows and apple proliferation. 相似文献
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M. G. Schlag 《Forest Pathology》1995,25(2):83-94
Oaks (Quercus petraea, Q. robur) from several sites in eastern Austria affected by novel oak decline (NOD), as well as oaks (Q. robur) showing symptoms of oak yellows (OY), were tested for the presence of mycoplasma-like organisms (MLOs). The samples, comprising roots, annual shoots, and branches, were examined using light-, fluorescence-, and electron-nucroscopic techniques. Staining with the DNA-fluorochrome DAPI provided no evidence for the presence of MLOs in any of the samples. Furthermore, no pathological sieve-tube necrosis and no abnormal callose accumulation could be observed. An association of MLOs with‘novel oak decline’ or ‘oak yellows’ is, therefore, unlikely. 相似文献
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Mycoplasma-like organisms (MLOs) were detected in almost all examined trees of Alnus glutinosa and A. incana older than approximately 5 years. The minority of trees showed symptoms of decline while the others appeared healthy. MLOs were also found in A. glutinosa var. barbata, A. hirsuta, A. rubra, A. rugosa, A. subcordata, and A. tenuifolia. 相似文献
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菟丝子(Cuscuta spp.)是一种寄生植物,利用菟丝子为介体可以将植物病毒或类菌原体(mycoplasma like organism)从一株植物传染到另一株植物上。杨一朗陈景耀分别用大豆菟丝子和南方菟丝子为媒介成功地将甘薯丛枝病从甘薯传到长春花上,产生花器叶化、侧枝丛生病状。 相似文献
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Mycoplasma-like organisms (MLOs) were detected and characterized by RFLP analysis in declining trees of Alnus glutinosa and A. cordata in Southern Italy for the first time. The infected trees showed symptoms of yellowing, sparse foliage, premature autumn colouration, sprouting, deliquescent branching, phloem necrosis, dieback and witches’ brooms. 相似文献
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NDVI在澜沧江流域山区林地覆盖遥感监测中的应用研究 总被引:6,自引:0,他引:6
澜沧江流域处于澜沧江———湄公河国际河流上游山地区域 ,生态环境复杂、特殊 ,生态系统十分脆弱。由于林地覆盖状况与流域山地土壤侵蚀、滑坡 ,水资源恶化 ,以及与高山野生动植物消失、遗传性物种多样性迅速减少等区域环境退化问题有着非常密切的关系 ,因此 ,在流域整体综合开发研究中 ,及时、快速地获得对维护山地生态系统非常关键、敏感的林地覆盖宏观状况的监测 ,对于澜沧江———湄公河国际河流的可持续发展研究是非常必要的。这里就利用NDVI进行山区林地覆盖快速遥感监测的技术展开应用研究 ,以期为较大区域的澜沧江流域林地覆盖… 相似文献
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道路交点设站测定中桩方法 总被引:1,自引:1,他引:0
本文介绍了施工放样过程中.在交点安置仪器测定曲线中桩点位的方法。给出了计算公式、测定步骤及计算实例。特别对高等级公路的施工定线.即能提高放样精度。又能加快放样的速度.是只得推广应用的有效方法。 相似文献