横断山蹄盖蕨科新分类群

在编写《横断山维管植物》一书的过程中发现了一些新分类群,它们包括九个新种和十二个新变种,现报道如下。文中的引证标本,未注明保存地点的,均保存在“PE”。 1.棕鳞短肠蕨 新种 图1:1—2 Allantodia forrestii Ching,sp.nov.:Ching ex Z.R.Wang in W.T.Wang et al.,Vasc. Pl.Hengduan Mount.1:90.1993.nom.seminud.     

国产蹄盖蕨属软刺蹄盖蕨组植物的研究

作者对国产蹄盖蕨属软刺蹄盖蕨组植物从形态分类和地理分布上进行了研究,共计载了23种。其中Athyrium densisorum,A.medogense和A.chingianum为新种,A.paranigripes为一新名称。文中还附有分类检索表,每种都有文献、异名和标本引证及地理分布。     

中国蹄盖蕨属耳蕨状蹄盖蕨组植物的分类与分布

报道了蹄盖蕨属耳蕨状蹄盖蕨组植物２系８种;有分种检索表、文献引证、标本引证以及本组植物的分布。     

中国蹄盖蕨属三新种

碧江蹄盖蕨新种图1 Athyrium bijiangense Y. T. Hsieh et W. M. Chu, sp. nov. Species proxime affinis A. christensenii Tard. Blot, a quo differt lamina frondis oblongo-lanceolata, pinnulis ca. 1cm longis, ca. 4mm latis, apice obtusis et aristato-serratis non rotundo-truncatis et integris, soris costulae propioribus. Tota planta ca. 55cm alta; rhizoma erectum, cum basibus stipitis paleis atro-fuscibus linearibus dense obtectum; frondes caespitosae;     

中国蹄盖蕨属轴果蹄盖蕨系的研究

本文是中国蹄盖蕨属植物研究的系列论文的第三篇,对国产轴果蹄盖蕨系植物进行了分类学订正,详细记载了中国产该系植物11种,首次将20余个名称归入该系的一些种下做为异名处理。轴果蹄盖蕨系植物是蹄盖蕨属中自然的一群,以其铁角蕨类型的孢子囊群和囊群益与其它属下类群相区别。本系植物分布于亚洲热带和亚热带山地,常见于山地常绿阔叶林下,海拔500～1800m。在华中和华东地区其分布区北界不超过长江一线。中国西南地区和台湾及日本为该系的三个分化中心。     

湖南省蹄盖蕨科新分布

报道在湖南省新发现的蹄盖蕨科植物１０属,３６种。     

直立介蕨是假蹄盖蕨属的成员

对直立介蕨Dryoathyrium erectum (Z. R. Wang) W. M. Chu &; Z. R. Wang与介蕨属Dryoathyrium、假蹄盖蕨属Athyriopsis的叶、毛、孢子囊群和孢子的形态进行了比较研究。直立介蕨叶轴和羽轴上的沟槽不明显、具有单列细胞的节状毛、孢子囊群有双生一脉, 以及孢子的形态等特征与假蹄盖蕨属植物相似。结合叶绿体DNA trnL-F区序列分析结果, 所有形态及分子资料均表明该种植物应属于假蹄盖蕨属, 应恢复其原名直立假蹄盖蕨Athyriopsis erectum Z. R. Wang。     

湖南省假蹄盖蕨属一新种

湖南省假蹄盖蕨属一新种吴世福（上海技术师范学院生物系上海２０１４１８）关键词湖南省;假蹄盖蕨属;狭叶假蹄盖蕨ＡＮＥＷＳＰＥＣＩＥＳＯＦＡＴＨＹＲＩＯＰＳＩＳＦＲＯＭＨＵＮＡＮ￥ＷｕＳｈｉｆｕ（ＤｅｐａｒｔｍｅｎｔｏｆＢｉｏｌｏｇｙ,ＳｈａｎｇｈａｉＴ...     

Apomixis in the interspecific triploid hybrid fern <Emphasis Type="Italic">Cornopteris christenseniana</Emphasis> (Woodsiaceae)

Cornopteris christenseniana is a "sterile" interspecific triploid hybrid of diploid C. crenulatoserrulata and tetraploid C. decurrenti-alata. Morphological and cytological studies show that, of 41 young plants of Cornopteris that have been propagated naturally in the Fern Garden of the Botanical Gardens, University of Tokyo, 30 plants are the sterile C. christenseniana, 10 are fertile C. decurrenti-alata and 1, fertile C. crenulatoserrulata. This proportion supports the view that the young plants of C. christenseniana are derived from spores of reproductively mature plants of the species cultivated. Cytogenetic observations and culture experiments show that C. christenseniana produces normal spores in various proportions in some sporogenetic pathways that are aberrant from the ordinary process in sexual and apomictic ferns. Under culture conditions, normal spores germinate in rough proportion to the frequency of normal spores, and sporophytes are apogamously produced in rough proportion to the frequency of spore germination. As a whole, the rates of spore germination and apogamous sporophyte development vary according to the specific plant. Taken together, these observations suggest that C. christenseniana is an incipient apomict. Electronic Publication     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.