甘肃悬钩子属系统分类及区系地理研究

甘肃省产悬钩子属植物３４种、８变种、隶属于３组１１亚组,其中５个种为甘肃分布新记录、个新种及１个新变种。本文根据实地调查和标本鉴定,编制了系统检索表,并对甘肃悬钩子属植物区系成分及区系成进行了初步探讨。     

中国悬钩子属新分类群

近年来对我国９个省的悬钩子属植物资源进行了调查采集,并在南京中山植物园建立了田间种质库进行观察研究。本报导在云南省悬钩子资源调查中发现的１个新种和５个新变种,它们是：Ｒｕｂｕｓ ｇｏｄｏｎｇｅｎｓｉｓ Ｇｕ ｅｔ Ｌｉ,Ｒ．ｂｉｆｌｏｒｕｓ Ｂｕｃｈ．－Ｈａｍ．ｅｘ Ｓｍｉｔｈ ｖａｒ．ｓｐｉｎｏｃａｌｙｃｉｎｕｓ Ｙｕ ｅｔ Ｌｕ ｖａｒ．ｅｇｌａｎｄｕｌｏｓｕｓ Ｇｕ ｅｔ Ｌｉ,Ｒ．ｐａｒ     

中国悬钩子属新分类群

近年来对我国 9个省的悬钩子属植物资源进行了调查采集 ,并在南京中山植物园建立了田间种质库进行观察研究。本文报导在云南省悬钩子资源调查中发现的 1个新种和 5个新变种 ,它们是 :RubusgodongensisGuetLi,R .biflorusBuch .-Ham .exSmithvar.spinocalycinusGuetLi,R .glabricarpusChengvar.eglandulosusGuetLi,R .gongshanensisY櫣ｅｔＬｕｖａｒ.eglandulosusGuetLi,R .parvifoliusL .var.purpureusGuetLi,R .viburnifoliusFockevar.apetalusGuetLi.     

福建省悬钩子属植物资源的调查、收集、评价和利用的研究

本文对福省建悬钩子属植物的种类和分布进行了调查研究,该属植物在福建计有41种,5变种。其中1种、1变种是新分布。     

云南铁线莲属植物地理分布及区系特征

依照王文采和李良千最新系统,云南有铁线莲属(Clematis)植物59种24变种,分属于3亚属6组,是中国该属种类分布最多的省份。横断山区可能是该属的起源、分化和特有中心,而滇西、滇西南以及滇东南地区也与该属的分化有一定联系。云南铁线莲属植物特有现象较为突出:含中国特有的56种(含变种),占云南总种数的67·2%;云南特有16种(含变种),占云南分布的中国特有种的35·0%。云南铁线莲属植物与国内邻近的四川关系最为密切,西藏的关系最弱;与国外邻近的缅甸具有一定的联系。     

福建野生悬钩子利用价值大

福建地处南亚热带,以低山丘陵为主,有着得天独厚的自然优势,孕育了种类繁多的野生植物。尤其是悬钩子属（Rubus）植物在我省境内分布甚广,共有49种6变种,总种数上仅次于云南、四川、贵州及广东等省,其中中国特有种25种4变种。在地理分布上,除茅菊、山海。高粱泡、蓬氨红     

云南省古茶树资源调查与分析

为更好地保护和开发利用古茶树资源,2010-2017年对云南省12个地区58个县/市的古茶树资源进行了全面普查,依据《Flora of China》英文修订版分类确立了古茶树资源物种名录,建立初步的古茶树资源数据信息库。以此为基础,利用地理信息系统和统计学分析了云南古茶树资源种类组成、地理分布特征、生境类型及形态多样性。结果表明:云南古茶树种类多,调查共获得古茶树资源分布点474个,记录样本植株2570份,隶属7种6变种;古茶树资源分布广而不均,主要分布于滇西、滇南、滇东南及滇中哀牢山山脉,滇东南是古茶树物种多样性的分布中心,滇西是特有种的分化中心,云南古茶树资源的地理分布可能存在滇西-大理茶(Camellia taliensis(W.W.Sm.)Melch.)、滇南-普洱茶(C.sinensis var.assamica(J.W.Mast.)Kitam.)和滇东南-厚轴茶(C.crassicolumna H.T.Chang)3个现有分布中心;古茶树资源生境复杂多样,可大致分为原生林、次生林和高山旱地等3类,不同生境分布的古茶树种类及其生长状况有差异;古茶树资源具有丰富的形态多样性,其描述型性状多样性指数为0.58~1.48,数值型性状变异系数为4.37%~51.03%,总体上营养器官的变异性高于花部器官。本工作为进一步探讨云南地区古茶树资源的系统演化、多样性保护及合理利用提供了重要的本底资料。此外,根据古茶树资源现状,初步提出了一些保护利用建议。     

皖南悬钩子植物资源及开发利用

本文对皖南悬钩子属植物的种类及分布进行了调查研究,该属植物皖南有20种5变种,并报道了该资源的开发利用价值。     

江西悬钩子属的分类和地理分布

通过野外调查和查阅大量标本和文献,对江西悬钩子属植物的分类和地理分布进行了较为系统的研究。江西境内共有悬钩子属植物43种7变种2变型,其中红花悬钩子Rubus inopertus(Diels)Focke,大红泡R.eustephanus Focke ex Diels,深裂锈毛莓R.reflexus Ker var.lanceolobus Metc为江西新分布。编制了检索表,并讨论了江西悬钩子属植物的地理分布。     

西藏墨脱悬钩子属植物小志

该文在野外调查、标本采集、标本查阅与鉴定及文献考证的基础上,对西藏墨脱县产的蔷薇科悬钩子属植物进行了系统整理。结果表明:目前发现该区共有悬钩子属植物28种4变种,其中Rubus lineatus Reinw. var. glabrior Hook. f.为中国分布新记录植物,小柱悬钩子(R. columellaris Tutcher)、红毛悬钩子(R. wallichianus Wight et Arn.)、独龙悬钩子(R. taronensis C. Y. Wu ex T. T. Yu et L. T. Lu)和疏松悬钩子(R. efferatus Craib)为西藏分布新记录植物。该文还对《中国植物志》和Flora of China中该属部分学名的不恰当使用进行了探讨。     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

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.     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.     

Enterovirus 71 3C proteolytically processes the histone H3 N-terminal tail during infection

Highlights
1. The N-terminal tail of histone H3 is specifically cleaved during EV71 infection.
2. Viral protease 3C is identified as a protease responsible for proteolytically processing the N-terminal H3 tail.
3. Our finding reveals a new epigenetic regulatory mechanism for Enterovirus 71 in virus-host interactions.