湖北开口箭属一新种

本种与碟花开口箭(T. tui(Wang et Tang)Wang et Liang)近缘,不同在于:本种叶多达6—9枚,带形,叶基显著扩大而包茎,花被筒内无斑点,柱头钝三角形,明显3裂。初看性状上似乎近剑叶开口箭(T. ensifolia Wang et Tang)和金山开口箭(T.jinshanensis Z. L. yang et X. G. Luo),主要区别在于:本种花被喉部具有向内扩展     

开口箭属五种植物的花粉形态学研究

用醋酸酐分解法处理开口箭属５种植物的花粉粒,在光学显微镜和扫描电镜下观察花粉粒的形态,为鉴别种类和研究系统亲缘关系提供特征依据。     

开口箭属一新种及其核型和花粉形态

文章报道了新种屏边开口箭T．pingbianensis J．L．Huang et X．Z．Liu及其核型和花粉形态。屏边开口箭的核型公式为2n=38=14m+lOsm+8st+6t,具明显的二型性,属3C型。花粉粒为球形,无萌发孔沟,外壁具皱块状纹饰。从花结构、核型和花粉形态上看,屏边开口箭和伞柱开口箭T．fungilliformis Wang et Liang亲缘关系近,而且伞柱开口箭比屏边开口箭在一系列特征上都较特化。     

万年青属和开口箭属5个种的核型研究

本文对江西、浙江、四川的万年青Rohdea japonica,开口箭Tupistra chinensis、筒花开口箭 T．delavayi、金山开口箭T．jinshanensis以及弯蕊开口箭T.wattii的核型进行了分析,其中筒花开口箭、金山开口箭和弯蕊开口箭的核型为首次报道。万年青属的基本核型为2n=38＝26m十10sm十2st;开口箭属的基本核型为2n=38＝26m+12sm,两者极为相似。本文还对万年青属、开口箭属与其邻近属——铃兰属Convallaria、吉祥草属Reineckia、白穗花属Speitantha,蜘蛛抱蛋属Aspidistra等的核型进行了分析讨论。     

开口箭基因组中微卫星特征分析与分子标记开发

开口箭(Tupistra chinensis Baker)为百合科(Liliaceae)开口箭属(Tupistra Ker-Gawl)多年生草本植物,其野生资源稀少,为中国珍稀药用植物。该研究基于第二代测序技术首次建立了开口箭的基因组文库与微卫星文库,对开口箭的微卫星组成进行了特征分析,开发了开口箭SSR引物一套,并对开口箭及其近缘种进行了PCR扩增与聚丙烯酰胺凝胶电泳检测。结果表明:(1)通过对开口箭基因组测序与拼接得到23 362条基因序列,检测出微卫星位点1 465个,其中单核苷酸重复最多,二核苷酸重复长度变异最大。(2)所设计的52对微卫星引物中有14对扩增出的条带清晰且多态性丰富,每个位点的复等位基因数(Na)在2~4之间,平均为3.00;多态性信息含量(PIC)在0.336 9~0.785 6,平均为0.546 3。(3)用筛选出13对多态性引物对6个开口箭近缘种,长柱开口箭(Tupistra grandistigma)、筒花开口箭(Tupistra delavayi)、弯蕊开口箭(Tupistra wattii)、剑叶开口箭(Tupistra ensifolia)、吉祥草(Reineckia carnea)和万年青(Rohdea japonica)进行通用性检测,结果大部分引物均能在开口箭的近缘种中成功扩增,通用率较高。该研究所开发的开口箭微卫星分子标记为开展开口箭的遗传多样性研究及种质资源鉴定奠定了基础。     

开口箭属植物形态学和根状茎组织学的研究

报道5种开口箭属植物的形态学和根状茎组织学的鉴定结果,列出了形态学和组织特征分种检索表。     

开口箭属五种植物叶的组织学研究

采集开口箭属五种植物的新鲜叶片,对其叶片解剖结构特征和叶下表皮细胞微形态进行了研究。     

宝铎草和长穗开口箭的核型

本文对湖南产的宝锋草（ＤｉｓｐｏｒｕｍｓｅｓｓｉｌｅＤ．Ｄｏｎ）和广西产的长穗开口箭（ＴｕｐｉｓｔｒａｌｏｎｇｉｓｐｉｃｇＹ．ＷａｎｅｔＸ．Ｈ．Ｌｕ）的核型作了分析。前者的核型公式为２ｎ＝１４＝４ｇ＋１０ｓｍ（２ｓａｔ）,核型类型属于３Ａ;后者的核型公式为２ｎ＝３８＝２４ｍ＋６ｓｉｎ＋８ｓｔ．核型具有明显的二型性,属于２Ｃ型。此外还讨论了宝锋草的核型变异以及开口箭属和蜘蛛抱蛋属（Ａｓｐｉｄｉｓｔｒａ）的关系。     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.     

杆状病毒出芽病毒粒子膜融合蛋白的研究进展

杆状病毒是一类感染节肢动物的病原微生物,其基因组为双链环状DNA,大小为80～180kb.     

Inception of the Modern Public Health System in China and Perspectives for Effective Control of Emerging Infectious Diseases: In Commemoration of the 140th Anniversary of the Birth of the Plague Fighter Dr. Wu Lien-Teh

In this article, we systematically review Dr. Wu Lien-Teh's academic achievements and outstanding contributions in the prevention and control of the plague epidemic in northeast China and introduce the development of the earliest public health epidemic prevention system in China in order to commemorate the 140th anniversary of Dr. Wu Lien-Teh's birth. We hope that this article will provide insights into the effective prevention and control of emerging infectious diseases as well as the current worldwide pandemic of COVID-19, facilitating the improvement and development of public health systems in China and around the globe.