共查询到16条相似文献，搜索用时 31 毫秒
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杨传东；王晓宇；苟光前 《植物研究》2012,32(4):389-391
报道了产于中国贵州梵净山景天属一新种——梵净山景天（Sedum fanjingshanensis C.D.Yang et X.Y.Wang）。新种与单花景天（S.correpta Fröderström）相似,但雄蕊10枚,排列成2轮而不同。该种与小山飘风（S.filipes Hemsley）亦相似,但花单生于枝顶而明显不同。 相似文献
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浙江景天属(景天科)一新种--贺氏景天 总被引：3，自引：0，他引：3
贺氏景天新种图1:1~7Sedum hoiX.F.Jin et B.Y.Ding,sp.nov.Fig.1:1-7Type:China.Zhejiang(浙江),Lin’an(临安),Tianmushan(天目山),Hengtang(横塘),on rocks un-der forests,1957-07-15,Y.Y.Ho(贺贤育)25418(Holotype,here designated,HHBG)Species affinisS·leptophylloFr 相似文献
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【目的】2021年在中国江西东北部阳际峰国家级自然保护区进行林木种质资源调查时发现一种景天科(Crassulaceae)景天属(Sedum L.)植物,该种与已报道的同属植物均有区别,本文予以论述并确定其分类学地位。【方法】跟踪阳际峰保护区多个种群,在不同物候期进行详细观察和形态学比较,确定其相近种及区别特征,进而通过文献检索和标本查询确定其在全国分布情况。【结果】该种营养枝在幼苗阶段呈莲座状,最为相似种为细小景天(Sedum subtile Miq.),区别特征为新发现种具有发达且3叶轮生的不育枝、花茎上每分枝5～16朵花,苞片匙状倒披针形;细小景天不育枝细弱且叶互生或对生、花茎每分枝3～5朵花、苞片线形。【结论】该种为景天属一新种,命名为“溪水景天”(Sedum fluviale B. Chen&Z. W. Zhu)。该种专一性地生于溪流环境,分布范围较广,包括江西、浙江、福建、安徽、湖南、贵州等省(区、市),此前存在较多错误鉴定的情况。模式标本存放于上海辰山植物标本馆(CSH)。 相似文献
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采用光学显微镜及扫描电子显微镜观察了安徽省景天属(Sedum)12种植物的花粉结构。结果表明,景天属是一个很好的自然分类群;其花粉应属较进化的一类;并首次从孢粉学角度证实了江南景天(S.kiangnanense)、凹叶景天(S.emarginatum)同属一个自然分类群(景天属),但又确为二个不同的种。 相似文献
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中国景天属一些种的订正 总被引：3，自引：0，他引：3
本文对国产景天属的6种植物进行了分类订正。归并了7种1亚种和2变种,同时对中国植物志中景天属存疑种Sedum phyllanthum Levl.et Vant.和S.subtile Miq.的范围及其分类地位进行了讨论。根据对S.hsinganicum Chu ex S.H.Fu的模式标本以及S.floriferum Praeger模式标本图和模式产地标本的研究,确认二者所具性状均在S.aizoon L.的性状变异范围内,故予归并。S.onychopetalumFrod.,S.grammophyllum Frod以及S.anhuiense S.H.Fu et X.W.Wang经研究均被作为S.lineareThunb.的异名处理。S.formosanum N.E.Br.在《中国植物志》中被并入S.alfredii Hance,现恢复为独立的种。此外还报道了一个中国新记录种S.hakonense Makino。 相似文献
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安徽景天属（Sedum）植物叶表皮研究 总被引：2，自引：2，他引：2
利用光学显微镜和扫描电子显微镜观察安徽省１２种景天属（Ｓｅｄｕｍ）植物的叶表皮,统计并测量报气孔类型,气孔大小,气孔密度及气孔指数等,描述了表皮角质膜,蜡质纹饰及气孔外拱盖的有关特征。结果表明：景天属植物叶表皮气孔器为不等细胞型。气孔器类型,表皮细胞形状及垂周壁式样,角质膜,蜡质纹饰等,种间无差异或极小,而气孔大小,气孔器分布特征,气孔密度,表皮毛等种间差异较大,建议在种间区分上将差异大的特征作为 相似文献
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Abstract The tubular protein inclusion of the chloroplasts of some CAM plants was found to maintain its normal pattern of accumulating by day and dissolving at night when the hydration state of the chloroplasts was reversed by promoting influx of water during the day and efflux of water during the night. Morphometric study of the chloroplast inclusion of Sedum telephium supports our suggestion that the behaviour of the aggregate of tubules is independent of the water content of the chloroplasts. 相似文献
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东南景天对锌、镉复合污染的反应及其对锌、镉的吸收和积累特性 总被引：11，自引：0，他引：11
东南景天(Sedum alfredii Hance)已被鉴定为一种中国原生的新的锌超积累植物。 本文主要研究了锌(Zn)、镉(Cd)复合处理水平对东南景天的生长及其对锌、镉的吸收积累特性的影响。 结果表明,在Zn/Cd复合水平为500/100 祄ol/L时,植物生长最佳。Zn/Cd在东南景天叶片、茎部和根系中含量随着Zn/Cd处理水平的提高而增高。在Zn/Cd 复合水平为50/400 祄ol/L时茎叶中Cd含量达最高,其中叶片Cd含量达12.1 g/kg;在Zn/Cd 复合水平为1 000/50 祄ol/L时茎叶中Zn含量达最高, 其中茎中Zn含量达 23.2 g/kg。 植株各部位Cd含量的分布为:叶片>茎>>根系,而Zn在体内的分布为: 茎>叶片>>根系。 Zn、Cd在地上部和根部的积累量也随着处理水平的提高而增加,分别在Zn/Cd复合水平为250/400和500/100 祄ol/L下达高峰值。 东南景天地上部积累最高Zn和Cd的量分别达11和5 g/plant, 其比根系的积累量分别大10和25余倍。 Zn、Cd对东南景天的生长、吸收积累的相互作用依赖于Zn/Cd复合水平和植物部位。 在适宜Zn/Cd 处理水平范围内,Zn和Cd的吸收和积累具有相互促进作用。 高Zn或高Cd处理均抑制了植物对Zn和Cd的吸收和积累。 本研究结果表明,东南景天不仅具有忍耐高Zn/Cd复合污染,而且具有超量积累Zn和Cd的特异能力。 它为进一步研究植物Zn、Cd 相似文献
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本文涉及百合科菝葜属Smilax 7个分类群：用Smilax longibracteolata J.D.Hook.和S.elegans Wall.ex Kunth分别代替中国植物志第15卷(1978)中由于鉴定错误而使用的〖WTBX〗S.ma ireiH.Lévl.和S.glaucophylla Klotz.S.mairei是一个完全不同的种,应予承认,现根据存于爱丁堡的模式标本予以重新描述。S.pinfae nsis H.Lévl.和nthaC.H.Wright 在中国植物志第15卷中被分别并入S.cocculoides Warb.和S.ferox Wall.ex Kunth,现恢复为独立的种。此外,本文还发表了一个新改级〖WTBX〗S.retroflexa[WTBZ] (Wang et Tang ) S.C.Chen和一个新名称S.munita S.C.Chen,后者用来代替晚出同名S.rigida Wall.ex Kunth。 相似文献
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AIMS: To develop a multiplex PCR that allows the identification of bacteria belonging to the Staphylococcus genus and in particular to the species Staphylococcus xylosus, S. saprophyticus, S. epidermidis and S. aureus isolated from food manufacturing plants. METHODS AND RESULTS: Five primer pairs were used in the multiplex PCR, one specific to the Staphylococcus genus and four specific to S. xylosus, S. saprophyticus, S. epidermidis and S. aureus species. All the 31 Staphylococcus reference strains yielded a specific PCR product with the genus-specific primers. Staphylococcus xylosus, S. saprophyticus, S. epidermidis and S. aureus gave a specific PCR fragment with the corresponding species-specific primers. No amplification with the Kocuria, Macrococcus and Micrococcus strains was observed in our conditions. This multiplex PCR was performed on 30 strains of Gram-positive cocci isolated from different workshops and fermented sausages. Among them, 28 belonged to the Staphylococcus genus and 14 were identified to S. saprophyticus, four to S. xylosus, two to S. aureus and one to S. epidermidis. CONCLUSIONS: This multiplex PCR provided reliable and repeatable PCR results. It allowed the identification of a major part of the isolates, highlighting the predominance of the S. saprophyticus species in the workshops studied. SIGNIFICANCE AND IMPACT OF THE STUDY: This tool is a useful way to screen the strains isolated from foodstuff and food environment and to monitor these species during the food processing. 相似文献
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The phytotoxicity and antioxidative adaptations of lead （Pb） accumulating ecotype （AE） and non-accumulating ecotype （NAE） of Sedum alfredii Hance were investigated under different Pb treatments involving 0, 0.02 mmol/L Pb, 0.1 mmol/L Pb and 0.1 mmol/L Pb/0.1 mmol/L ethylenediaminetetraacetic acid （EDTA） for 6days. With the increasing Pb level, the Pb concentration in the shoots of AE plants enhanced accordingly, and EDTA supply helped 51% of Pb translocation to shoots of AE compared with those treated with 0.1 mmol/L Pb alone. Moreover, the presence of EDTA alleviated Pb phytotoxicity through changes in plant biomass, root morphology and chlorophyll contents. Lead toxicity induced hydrogen peroxide （H2O2） accumulation and lipid peroxidation in both ecotypes of S. alfredii. The activities of superoxide dismutase （SOD）, guaiacol peroxidase （G-POD）, ascorbate peroxidase, and dehydroascorbate reductase elevated in both leaves and roots of AE as well as in leaves of NAE with the increasing Pb levels, but SOD and G-POD declined in roots of NAE. Enhancement in glutathione reductase activity was only detected in roots of NAE while a depression in catalase activity was recorded in the leaves of NAE. A significant enhancement in glutathione and ascorbic acid （AsA） levels occurred in both ecotypes exposed to Pb and Pb/EDTA treatment compared with the control, however, the differences between these two treatments were insignificant. The dehydroascorbate （DHA） contents in roots of both ecotypes were 1.41 to 11.22-fold higher than those in leaves, whereas the ratios of AsA to DHA （1.38 to 6.84） in leaves altering more to the reduced AsA form were much higher than those in roots. These results suggested that antioxidative enzymes and antioxidants play an important role in counteracting Pb stress in S. alfredii. 相似文献
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Sedum alfredii Hance is a newly reported zinc (Zn) and cadmium (Cd) hyperaccumulator native to China. In this study,four populations of S. alfredii were collected from Yejiwei (YJW), Jinchuantang (JCT) and Qiaokou (QK) lead (Pb)/Zn mines located in Hunan Province as well as Quzhou (QZ) Pb/Zn mine located in Zhejiang Province for exploring the intraspecies difference of this plant in metal accumulation. Although they grew in the Pb/Zn spoils with relatively similar levels of Zn,Cd and Pb, remarkable differences among the four populations in tissue heavy metal concentrations were observed. The shoot Zn concentration of QZ population (11 116 mg/kg) was highest and nearly five times higher than that of the JCT population (1930 mg/kg). Furthermore, the shoot Cd concentration observed in the QZ population (1 090 mg/kg) was also highest and 144 times higher than that found in the JCT population (7.5 mg/kg). As for Pb concentrations In the shoot of different populations, a fourfold difference between the highest and the lowest was also found. Such difference on metal accumulation was opulation-specific and may be significantly explained by differences in the soil properties such as pH, organic matter (OM), and electrical conductivity (EC). Taking biomass and metal concentration in plants into consideration, the QZ, YJW and QK populations may have high potential for Zn phytoremediation, the QZ population may have the highest potential in Cd phytoremediation, and the QK population may be the most useful in Pb phytoremediation. 相似文献