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金盏苣苔属(苦苣苔科)的第二次校订 总被引：3，自引：1，他引：3
金盏苣苔属(Isometrum Craib)属于苦苣苔亚科(Cyrtandroideae)长蒴苣苔族(Didymocarpcae),是由W.G.Craib 1919根据I.farreri Craib建立的,同年他又把Didissandra glandulosa Batalin置于该属,1960年B.L.Burtt又把Didi-sandra Clarke中的4个种(即:D.prumuliflora Batalim,D.giraldii Diels,D.fargesii Franch.和D.leucantha Diels)移入该属。作者在编写中国植物志苦苣苔 相似文献
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A Cytotaxonomic Study on Chinese Dioscorea L.—The Chromosome Numbers and Their Relation to the Origin and Evolution of the Genus 
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下载免费PDF全文 Chin Hui-Chen Chang Mei-Chen Ling Ping-Ping Ting Chih-Tsun Dou Fang-Ping 《植物分类学报：英文版》1985,23(1):11-18
The chromosome numbers of 5 tuberous sections of Chinese Dioscorea, including 23 species and varieties, are reported in the present paper as a continuation of the previous reports. They are all polyploids with the basic number x=10. On the basis of analysis of chromosome numbers of whole genus, the rhizomatous diploid species of Sect. Stenophora Uline are presumed to be primitive taxa, while the polyploids of chromosome numbers 40-142 are considered derived groups as a result of hybridization between their ancestral diploids followed by chromosome doubling. Sect. Lasiophyton Pr. et Burk., Sect. Opsophyton UIine, Sect. Shannicorea Pr. et Burk., Sect. Combilium Pr. et Burk. and Sect. EnantiophylIum Uline may be the advanced groups. The chromosomal evolution and geographical distribution suggest that the primitivediploid might have originated in Hengduan Mountains of Asia, an old highland. 相似文献
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Chang Roh-Hwei 《植物分类学报：英文版》1984,22(2):110-118
The first classification for the genus Ormosia was proposed by Bentham. It wasfollowed by Taubert (1892) in Engler and Prantl’s Nat. Pflanzenf., who divided the genusinto 2 sections. On the basis of the pod structure and seed characters Prain (1900) arranged the genus in 2 sections with 4 subsections. In the monograph on the genus Merrilland L. Chen ( 1943 ) limited their taxonomic study to Chinese and Indo-Chinese species, andrecognized 34 species and 15 series. Recently Yakovlev (1971-1976) has treated the genus in 6 separate genera. In the present paper the author recognizes 35 species, of which 7 species and 2 varieties are new. The Chinese species of the genus are grouped into 3 sections and 6 series inmy classification. 相似文献
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Zhang Yu-Hua 《植物分类学报：英文版》1987,25(3):204-219
The genus Yinshania was established by Ma Yu-chuan and Zhao Yi-zhi in 1979,when only one species, Y. albiflora Ma et Y. Z. Zhao, was discribed from Nei Monggol. Inthe present paper the genus Yinshania is revised and four new species, two new varieties andfour new combinetions are reported. There are so far eight species and two varieties in totalin this genus. Important morphological characters of the genus are analysed, which shows that the lateralnectariferous glands positioned at lateral base of the brevistamens are triangularovoid; there aredense minute pustules on the surface of valves, which is easily neglected because the pustules disappear or shrinked when dry; simple or furcate hairs are present in the most species, seldom absent;the shape of pollen grains is relatively steady, elliptic or long-elliptic, with the polar view trifidcircular, the equatorial view elliptic or long elliptic, the aperture 3-colpate, exine reticular. The type of genus Yinshania is changed. Cochlearia acutangula O. E. Schulz was publishedin 1929, but Y. albiflora Ma et Y. Z. Zhao in 1979. They are the same species and a new combinetion, Y. acutangula (O. E. Schulz) Y. H. Zhang, is made. Thus, the type of genus Yinshania should be changed to Y. acutangula (O. E. Schulz) Y. H. Zhang. Besides, He Ye-qi 6121 (paratype, PE), which is different from Y. acutangula var. albiflora, is separated from it and transferred the typical variety, Y. acutangula. According to the characters of fruit shape the genus Yinshania is divided into two sections,namely, Sect. Microcarpa and Sect. Yinshania, and then Sect. Yinshania is subdivided into twoseries. Sect. 1. Microcarpa. Silicles widely ovoid or subglobose, 1-2.2 mm long, 0.8-2.2 mm wide,the ratio of length and width about 1.1. Sect. 2. Yinshania. Silicles oblong, oblong-ovoid or long-lanceolate, ellipsoidal, 1.5-4.5 mmlong, 0.3-1.5 mm wide, the ratio of length and width about 2.5-3.3. Ser. 1. Henryanae. Raches flexuose; plants densely hairy; leaves 3-5-foliolate, seldompinnatipartite or pinnatisect. Ser. 2. Yinshania. Raches non flexuose; plants sparsely hairy; leaves pinnatisect or pinnatipartite. The genus Yinshania is a genus endemic to China, with their range from eastern Xizang towestern Hubei from northern Guizhou to central Nei Monggol. The taxa are mostly of a smallarea. Sect. Microcarpa is concentrated in Sichuan and southern Gansu; Sect. Yinshania isspread from Xizang and Sichuan, nouthwards to Gansu, Ningxia, Shanxi, Hebei and Nei Monggol (Ser. Yinshania); and from Sichuan south-eastwards to Guizhou and Hebei (Ser. Henryanae). There are five species in Sichuan. The present paper conjectures that the distributioncentre of the genus is in the Hengduan Mountains and its adjacent areas. 相似文献
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应用ITS序列分析探讨偏花报春的系统位置 总被引：8，自引：0，他引：8
对于偏花报春Primula secundiflora Franch. 的系统位置,主要有两种意见,一种认为偏花报春具有典型的钟状花冠,应置于钟花报春组Sect．Sikkimensis;而另一种意见则依据其他特征将其置于灯台报春组sect．Proliferae。通过对偏花报春、灯台报春组4种植物和钟花报春组3种植物核糖体DNA中的内转录间隔区(ITS)的序列测定及分析,并结合形态学及染色体特征的比较论证,认为偏花报春应置于灯台报春组。 相似文献
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通过开展山茶属连蕊茶组（Camellia Sect. Theopsis）和毛蕊茶组（Camellia Sect. Eriandria）的花粉形态研究,为2组植物的系统演化、分类鉴定等提供一定的参考依据。以2组植物的20种（变种）材料为研究对象,进行花粉形态的扫描电镜观察。结果显示：（1）20种连蕊茶组和毛蕊茶组植物主要为中等花粉（25~50 μm）和大花粉（50~100 μm）,花粉极面观为三裂圆形,赤道面观为长球形,萌发孔类型为3孔沟型。（2）花粉的外壁纹饰主要包括孔穴状、疣状和颗粒状3种纹饰类型,长管连蕊茶（C. elongata）为孔穴状纹饰,蒙自连蕊茶（C. forrestii）和尖萼蒙自连蕊茶（C. forrestii var. acutisepala）为疣状纹饰,其余17种（变种）均为颗粒状纹饰。研究推测2组植物花粉外壁纹饰的演化趋势为孔穴状→颗粒状→疣状。花粉的形态特征支持连蕊茶组和毛蕊茶组植物为单系类群的观点,但作孚连蕊茶（C. tsofuii）和荔波连蕊茶（C. lipoensis）作为变种的分类观点有待进一步研究探讨。 相似文献
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中国马尾杉属(石杉科)的两个组 总被引：3，自引：0，他引：3
本文记述了中国产马尾杉属Ｐｈｌｅｇｍａｒｉｕｒｕｓ（Ｈｅｒｔｅｒ）Ｈｏｌｕｂ的两个组,即龙骨组（新组合）ｓｅｃｔ．Ｃａｒｉｎａｔｕｒｕｓ（Ｈｅｒｔｅｒ）Ｈ．Ｓ．Ｋｕｎｇ ｅｔ Ｌ．Ｂ．Ｚｈａｎｇ和马属组ｓｅｃｔ．Ｐｈｌｅｇｍａｒｉｕｒｕｓ。确认这两组在中国共８种,分别编写了两组的分种检索表及各种的地理分布,并提出一个新异名：Ｐｈ．ｃａｍｃｅｌｌａｔｕｓ ｖａｒ．ｍｉｎｏｒ（＝Ｐｈ．ｃａｎｃｅｌｌａ 相似文献
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山茶属(Camellia)植物集茶叶、茶油及茶花三大特色为一身。近年来,该属连蕊茶组(Sect. Theopsis)和毛蕊茶组(Sect. Eriandria)植物随着野生资源在束花茶花种质创新等方面的发展而逐渐受到关注。为在未来山茶的开发应用中进一步利用两组资源,本文重点总结连蕊茶组和毛蕊茶组的植物资源、观赏性及适应性、种质创新等方面的研究进展。1)山茶属主要包括闵天禄、张宏达及Sealy三个分类系统研究,按照张宏达分类系统,连蕊茶组资源48种,毛蕊茶组15种;闵天禄分类学系统连蕊茶组19种,毛蕊茶组9种。2)两组资源具开花繁密,叶形较小的特点;花的挥发性成分以苯乙醇、芳樟醇、柏木醇为主。3)在应用研究中主要体现在束花茶花的育种,连蕊茶组植物10余种,毛蕊茶组1～2种已用于种质创新。从目前的研究来看,两组资源的基础研究相对薄弱,亟需结合经典分类及现代分子生物等技术开展全面的综合性基础研究;在充分发挥我国特有连蕊茶组和毛蕊茶组资源的基础上,聚焦抗逆性及观赏性的种质创新,不断丰富该类资源在园林景观等方面的应用。 相似文献
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1. Photosystem I particles enriched in P-700 prepared by Triton X-100 treatment of chloroplasts show a light-induced increase in fluorescence yield of more than 100% in the presence of dithionite but not in its absence.2. Steady state light maintains the P-700, of these particles, in the oxidised state when ascorbate is present but in the presence of dithionite only a transient oxidation occurs.3. EPR data show that, in these particles, the primary electron acceptor (X) is maintained in the reduced state by light at room temperature only when the dithionite is also present. In contrast, the secondary electron acceptors are reduced in the dark by dithionite.4. Fluorescence emission and excitation spectra and fluorescence lifetime measurements for the constant and variable fluorescence indicate a heterogeneity of the chlorophyll in these particles.5. It is concluded that the variable fluorescence comes from those chlorophylls which can transfer their energy to the reaction centre and that the states PX and P+X are more effective quenchers of chlorophyll fluorescence than PX?, where P is P-700. 相似文献
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Duilio Iamonico 《Plant biosystems》2013,147(4):923-930
Arenaria bertolonii Fiori & Paol. is an orophyte and endemic European species of Italy and France. The name Stellaria saxifraga Bertol. (basionym of A. bertolonii) is typified on a herbarium specimen kept in BOLO. Infraspecific variability of the species is discussed and a comparison with related taxa included in the Subg. Arenaria was made on the basis of morphological analyses and chorological and cytological data. At the sectional level, the results show that A. bertolonii is clearly separate from the morphological and chorological points of view, thus supporting the proposal for a new monotypic section (Sect. Italiae Iamonico) of central Mediterranean species. The analysis of infraspecific variability instead highlighted overlapping morphological characteristics; the distribution areas of the infraspecific taxa are sympatric and any cytological difference is lacking, thus pointing to a synonymization of the names. Notes on the ecology and distribution of A. bertolonii are also provided. 相似文献
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菊科蒿属Ａｒｔｅｍｉｓｉａ的腺毛蒿组和白苞蒿组共有２６种８变种,为亚洲特有植物。前主产我国西南中、高海拔地区;后主产秦岭以南横断山脉以东各省区的中、低海拔地区,少数种在亚洲南部、东南部也有分布。除泰国艾Ａ．ｂｏｒｅａｌｉ－ｓｉａｍｅｎｓｉｓ外,其余国内均产。它们在蒿属蒿亚属中进化程度较高,且与其它组有明显的区别。选择亲缘关系最近的艾组为外类群。在外类群比较原则和形态演化原则的基础上,对大量性状 相似文献
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Twenty-six species and eight varieties of Sect．Viscidipubes & Sect．Albibractea are endemic to Asia．Most species of Sect．Viscidipubes are distributed from low to high altitudes and cold areas in the Hengduan-Himalayan Mountains,with only a few species extending to E or S Asia．Sect．Albibractea is distributed mainly in the subtropics and tropics,lower altitudes and moist areas in S & SE Asia,with a few species extending to the Qinling range of China．Both sections are more advanced than the other sections．They were studied by cladistic analysis and outgroup comparison．Data matrix of 55 characters from stems,leaves,inflorescences,female flowers,bisexual flowers,achenes,pollen grains and chemical constitution was employed in separate and combined studies．Eighteen most parsimonious cladograms were generated with 358 steps,consistency index of 0．72 and retention index of 0．87． 1．Within Artemisia,Sect．Viscidipubes and Sect．Albibractea are sister groups to all the other groups． 2．We support the idea to separate Sect．Viscidipubes (incl．Ser．Viscidipubes,Ser．Erlangshanenses and Ser. Pleiocephalea) and Sect．Albibractea (incl．Ser．Albibractea,Ser．Flaccidae and Ser. Anomalae)．The authors suggest that Ser．Anomalae include A．deversa and Ser．Erlangshanenses include A．zayuensis and A．yadongensis as well as Ser．Viscidipubes include A．gyitangensis and A．boreali-siamensis．As the result of the cladistic analysis,the authors tend to propose a new series, Ser．Tanguticae,incl．A．tangutica in the section．3．We consider that SW China,especially W Sichuan,is the speciation center and the tration of the present distribution center．4．A．boreali-siamensis,only in N Thailand,is not related to the widely distributed species in Ser．Pleiocephalae,such as A．atrovirens,A．chingii and A．myriantha,but rather closely related to species,such as A．vexans,A．occidentali-sichuanensis,which are endemic to W.Sichuan and E．Xizang． 相似文献
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Herbert L. Needleman 《人类与生态风险评估》2005,11(1):153-157
In the environmental health literature, errors in interpreting studies or data are not infrequent. Many are of the Type II variety. Common solecisms of this type are: treating the criterion of p < 0.05 as a sacrament; demanding complete confounder control; arguing for the existence of phantom confounders; arguing that the effect size is trivial; building nonveridical models; arguing for no effect from inadequate sample size; demanding causal proof; arguing that causality is reversed; conducting a ballot of published studies. These are examined in this paper. 相似文献
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中国后生耳蕨组的孢子形态研究 总被引：1，自引：0，他引：1
对国产耳蕨属后生耳蕨组２６种的孢子形态进行了研究。结果表明,后生耳蕨组的孢子周壁纹饰可大致分为粗糙、翅状、脊状、穴状和网状６类。各种的周壁纹饰均有一定差异,同种的孢子形态较为稳定。从孢子形态特征看,支持Ｐｏｌｙｓｔｉｃｈｕｍ ｙｕｎｎａｎｅｎｓｅ Ｃｈｒｉｓｔ和Ｐｊｉｚｈｕｓｈａｎｅｎｓｅ Ｃｈｉｎｇ为独立的种。本文还结合其它特征,讨论了后生耳蕨组孢子形态的演化趋势,进而从孢粉学的角度推测本组线鳞 相似文献