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黑龙江省蹄盖蕨科三属(蹄盖蕨属、羽节蕨属及冷蕨属)的遗传多样性分析 总被引:2,自引:1,他引:1
利用7种随机引物对分布于黑龙江省不同区域蹄盖蕨科中的蹄盖蕨属,羽节蕨属及冷蕨属三属的遗传多样性进行了初步分析,对蹄盖蕨科各种基因组的DNA进行了PCR扩增,并对其RAPD谱带进行了统计处理,得出不同区域种类的多态位点百分率,结果表明蹄盖蕨科植物具有较高水平的遗传变异,其种类的分布对周围环境变化有着较强的适应能力。利用Shannon指数和Nei指数对其分析,确定了三属之间的属内种间的亲缘关系:蹄盖蕨属的大部分变异仍存在于种源内;冷蕨属中的冷蕨和山冷蕨种类之间具有一定的遗传变异;羽节蕨属中,欧洲羽节蕨和羽节蕨种间有较大的遗传变异。 相似文献
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Wang Zhong-Ren 《植物分类学报:英文版》1983,21(1):102-104
The spores of all specimens of Cystopteris in the Herbarium of the Institute of
Botany, Academea Sinica have been examined under light microscope. The result of
the survey shows for the first time that the distribution of Cystopteris dickieana Sim
with non-spiny spores is also quite wide-spread in China, including provinces Xinjiang,
Xizang, Qinghai, Gansu, Sichuan, Hebei in northwestern China and Tibetan plateau.
The range of altitude for this species varies from 1800 to 5400(5600) m, but C. fragilis
(L.) Bernh. from 210 to 4600 m. The differences in the altitudinal distribution range
seem to suggest that C. dickieana is more tolerant of cold conditions than C. fragilis.
There are also variations in size and ornamentation of the spores in each of the two
species. Their ploidy and relationships await futher cytogenetical study from livingmaterials. 相似文献
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Three new species of ferns are described from Mexico:Athyrium tripinnatum, Cystopteris millefolia, andPolypodium praetermissum. 相似文献
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Denisa Blažková 《Folia Geobotanica》1973,8(3):225-230
Vesicular cavities in the lava fields of Northern Iceland communicate by small openings with the ground surface. Aeolian sediments, called the Icelandic Ioess, deposit over the bottom of these cavities, together with the reduced light intensity and equable microclimate, create specific biotopes occupied by sciophilous bryophytes andCystopteris fragilis. A new association within the allianceCtenidion Stefureac 1941—Cystopteri-Distichietum capillacei Bla?ková ass. nova— is described in the present paper. 相似文献
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北柴胡不定根培养及茉莉酸甲酯处理对柴胡皂苷含量的影响 总被引:2,自引:0,他引:2
目的:建立北柴胡不定根培养体系,明确茉莉酸甲酯(MeJA)处理对北柴胡不定根中柴胡皂苷含量积累的影响。方法:利用固体和液体相结合的组织培养技术培养北柴胡不定根;分别以不同浓度的MeJA处理不定根不同时间,利用HPLC测定处理后不定根中柴胡皂苷含量的积累变化。结果:培养了北柴胡不定根;MeJA处理对北柴胡不定根中柴胡皂苷含量的积累有明显促进作用,当MeJA浓度为200μmol/L时,柴胡皂苷含量最高,为0.45%;以200μmol/L MeJA处理北柴胡不定根26 d时,柴胡皂苷含量最高,为0.51%。结论:北柴胡不定根培养结合MeJA诱导,可做为柴胡皂苷次生代谢合成途径及其积累规律研究的有效技术体系。 相似文献
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Lycium amarum sp. nov. (Solanaceae) from Xizang,supported from morphological characters and phylogenetic analysis
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Lycium amarum sp. nov. L. Q. Huang is described based on its general morphology and pollen micromorphology, which were compared with closely related Lycium species. The phylogenetic relationships among the new species and closely related Lycium species belonging to the tribe Lycieae were investigated based on the DNA sequence data of the granule‐bound starch synthase (GBSSI) gene. Morphologically, L. amarum is similar to L. chinense Mill. sharing lanceolate or linear‐oblanceolate leaves, three‐lobed calyx, villous ring slightly above the filament base, and adjacent corolla tube, however, L. amarum may be diagnosed by its prominent tubercles at the base of spines, thinly leathery leaves, and a two‐tine crack on the tip of calyx lobes. According to our results, the new species is close to L. barbarum L., L. chinense, L. dasystemum Pojark, and L. yunnanense Kuang & Lu. 相似文献
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不同种群密度羊草生态场梯度及其变化特征 总被引:7,自引:2,他引:7
通过对植物个体与种群生态场定位实验研究,提出了生态场梯度的概念,并给出了植物与羊草个体生态场梯度的模型,植物生态场的场梯度是,生态场中生态势沿任意方向的变化率。羊草个体生态场梯度同羊草种群密度相关。 相似文献
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Professor Bayley Balfour F.R.S. 《Plant Ecology & Diversity》2013,6(2):157-220
Summary The discovery of the fern Cystopteris dickieana Sim in Kincardineshire (the type locality of the species) during the mid- nineteenth century, an its supposed extirpation only twelve years after being first brought to public notice is described. The background to its apparent disappearance and subsequent reappearance are examined. 相似文献
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红花檵木与檵木花数性表型变异研究 总被引:6,自引:0,他引:6
红花木与木花的数性结构有很大差异 ,木 4数性花占 96 2 %(花瓣、雄蕊、退化雄蕊、萼片均为 4数 ) ;野生红花木 4数性花约占 5 0 %;红花木栽培类型以 5数性花居多 ,不同类型品种花的数性结构亦有差异 ,总体变异规律为 :近期栽培品种双面红类 5数性花 >中期栽培品种透骨红类 >早期栽培品种嫩叶红类。利用花的数性表型变异探讨了品种的演化历史和新品种选育的前景。 相似文献
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羊草草地植物群落的分布与土壤水盐运动有着十分密切的关系。研究结果表明,羊草、拂子茅、獐毛和角碱蓬群落的土壤饱和导水率分别为0.0586cm·h-1,0.0567cm·h-1,0.0175cm·h-1和0.0004cm·h-1。当土壤含水量相同时,角碱蓬群落下土壤水吸力高于羊草群落。在相同的土壤水吸力范围内,角碱蓬群落下土壤非饱和导水率高于羊草群落。因此,角碱蓬群落在春季干旱时,土体内上行水流的数量和强度远远大于羊草群落。夏季降水集中时,角碱蓬群落下土体内下行水流又远远小于羊草群落。造成土体上部甚至表层的盐分积累。 相似文献
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永瓣藤的分布现状及其保护 总被引:10,自引:0,他引:10
本文从自然环境、分布特征、种群数量和种群繁殖等方面研究了我国珍稀特有植物永瓣藤(Monimopetalum chinense)的分布和保护现状, 并从引种栽培、种子繁殖和无性繁殖等方面总结了近年来对永瓣藤进行迁地保存的初步研究结果, 最后提出了相应的保护建议。 相似文献
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内蒙羊草草原群落光合速率日变化及其与环境条件之间相互关系的初步研究 总被引:1,自引:0,他引:1
群落光合生态的研究是植物物质生产研究的基础之一。通过群落光合速率及其与环境条件关系的研究,阐明制约光合的有关变量,就可以为估算植物的潜在生产力提供依据。为此进行群落光合特性以及与外界环境关系的研究,是群落光合生态研究中不可缺少的一个环节。 有关群落光合日变化及其与环境条件相互关系的研究已有不少报道(户刈义次,1979;Singh et al.,1980;Migasaka et al.,1978;权永忍,1980),但以作物方面的研究较为突出,而对天然群落的研究较少。 我们根据同化箱的气体交换法原理(群落光合研究的方法很多),试制了一台简易光合测定车。利用这个装置,于1981年7、8月间,对内蒙锡盟白音锡勒地区的羊草草原群落进行 相似文献
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Valéry Zeitoun Emmanuel Bourdon Keo Oudone Latsachack Alain Pierret Sommay Singthong Henry Baills Hubert Forestier 《Comptes Rendus Palevol》2019,18(1):142-157
The Hoabinhian is a distinctive lithic techno-complex of mainland and Island Southeast Asia. Knowledge of its relationships with key patterns of technological change at a global scale has progressed over the last two decades. However, our understanding of the Hoabinhian as an indicator of evolution during Prehistory can be substantially enhanced by examining its regional and chronological variability. Here, we present the characteristics of original Hoabinhian artefacts found in a new open-air site at Houay Pano, near Lak Sip (Luang Prabang province, Laos). This technological study of such a classic assemblage, including sumatraliths dated to 5.5 ± 0.6 ka, is a major contribution to Laotian prehistory and our understanding of the tempo-spatial variability of the Hoabinhian techno-complex. 相似文献
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The northeast region of India, considered as 'hot spot' of biodiversity, having unique ecological environment with hot and high-humidity conditions, has given rise to the world's hottest chilli, 'Bhut Jolokia', which is at least two times hotter than Red Savina Habanero in terms of Scoville heat units (SHU). This study was undertaken to determine the distinctiveness of 'Bhut Jolokia' from Capsicum frutescens or Capsicum chinense through sequencing of the ribosomal RNA (rRNA) gene-internal transcribed ((ITS) region along with its phylogenetic analysis. Although a compensatory base change (CBC) in the ITS2 region was not observed between the closely related species of C. frutescens and C. chinense when compared with Bhut Jolokia; phylogenetic analysis using ITS1, 5.8S and ITS2 sequences indicated a distinct clade for all the accessions of 'Bhut Joloikia', while C. frutescens and C. chinense occupied discrete lineages. Further, a unique 13-base deletion was observed in all the representative accessions of 'Bhut Jolokia', making it distinct from all other members within the genus and beyond. The degree of genetic variations along with its extreme pungency might be related to ambient environmental factors of northeastern India. 相似文献
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不同种群密度关态下羊草地上部生态场、生态势、场梯度及其季节性变化规律研究 总被引:3,自引:0,他引:3
本文通过对羊草种群与个体的定位观测与理论分析,给出了描述植物生态属性质的场特征函数──生志势和场梯度的定义,建立了羊草地上部生态场的生态势和场梯度模型。应用实验观测数据进行了模型运算,分析了草草地上部生态场随作用距离改变的生态势与场梯度变化规律。结果表明,羊草地上部场势与场源植物的相对生长速率、资源利用效力以及种群密度相失,场梯度能刻划生态势的空同变化速率,生态势和场梯度均有季节性变化特征。 相似文献