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1.
部分散生竹类染色体数目   总被引:1,自引:1,他引:0  
本文报道了中国74种竹的染色体数目,其中65种为首次报道。  相似文献   

2.
中国部分丛生竹类染色体数目报道   总被引:14,自引:0,他引:14  
本文报道了我国13属94种丛生竹类的染色体数目。其中21种已见报道,74种为首次报道。作者推测竹类染色体原始基数可能为x=8。多数丛生竹类染色体数目为2n=70±2。  相似文献   

3.
李庆伟  卞小庄 《遗传》1988,10(5):20-23
我国有鹏属鸟类26种闭,国内有关这一类 群的核型报道仅见王应祥等山,国外已报道了 鸦亚科9属20余种核型U1。本文报道了雀形目 鸭属9种鸟类核型,通过对近缘种之间染色体 配对比较,试图找出它们之间的演化关系。  相似文献   

4.
石斛属的染色体数Ⅰ.10种   总被引:1,自引:0,他引:1       下载免费PDF全文
本文报道10种国产石斛属(Dendrobium)植物的染色体研究结果。它们的染色体均属小型染色体,长度为1—3.47μm.染色体数皆为2n=38。其中有6种和国内外报道的结果相同,有4种为首次报道。  相似文献   

5.
南岭自然保护区真菌资源调查名录之二   总被引:2,自引:0,他引:2  
宋斌  陆勇军 《生态科学》1996,15(2):51-54
报道作者在南岭自然保护区调查所发现的各类真菌资源情况。报道高等植物上的寄生菌53种,枯枝落叶层的腐生菌52种和昆虫上的寄生菌1种,共计106种  相似文献   

6.
中国木本植物病原木材腐朽菌研究   总被引:24,自引:15,他引:9  
戴玉成 《菌物学报》2012,31(4):493-509
简要论述了中国木本植物致病木材腐朽菌,报道危害活立木的木腐菌152种,其中49种(占总数的34%)在中国首次报道为林木病原菌。对每个种的寄主、侵染部位、腐朽类型、发生频率及分布进行了报道。它们中有135种(占总数的89%)造成木材白色腐朽,17种导致褐色腐朽;67种为常见种,33种为偶见种,52种为少见种。  相似文献   

7.
山西产9种野生植物的染色体观察   总被引:1,自引:0,他引:1  
本文报道了产于山西的4科5属9种野生植物的染色体观察结果。其中有2种植物作了核型分析,5种植物的染色体为首次报道。  相似文献   

8.
山西关帝山部分植物的染色体研究   总被引:1,自引:0,他引:1  
报道了山西关帝山庞泉沟自然保护区7科、11属、13种植物的染色体研究结果。其中8种作了核型分析,4种的核型和2种的染色体数目为首次报道。  相似文献   

9.
中国芸苔族植物染色体数目的观察   总被引:6,自引:1,他引:5       下载免费PDF全文
本文报道了在我国分布或栽培的5属、41种和变种的芸苔族植物的花粉母细胞减数分裂期的染色体数,其中15种和变种是新报道。个别种类的数目与以往的报道不完全一致。  相似文献   

10.
根据浙江大学应用昆虫学研究所收藏的寄生蜂标本和国内外报道,对我国寄生斜纹夜蛾的原寄生蜂和重寄生蜂进行系统整理研究,列出我国斜纹夜蛾寄生蜂40种,其中包括原寄生蜂29种,重寄生蜂11种.同时还以附录的形式列出了我国已报道过但有存疑的寄生蜂7种及国外已有报道但在我国还未采集到标本的寄生蜂61种.  相似文献   

11.
新疆部分药用植物的染色体观察   总被引:3,自引:0,他引:3  
  相似文献   

12.
The chromosome numbers are given for 10 species of the flora from the Aragatz mountainous massif. For 7 species the chromosome numbers are presented for the first time or they differ from those already published by other authors. For the rest 3 species the chromosome numbers are confirmed. Five species of the 10 above-mentioned ones proved to be polyploids of various degree of ploidy, the rest--diploids. For the first time the new pentaploid chromosome race with 2n=30 was found in Scilla sibirica.  相似文献   

13.
Mitotic or meiotic chromosome studies are reported for 39 species or subspecies of Oxalis from South America belonging to 14 sections. Chromosome numbers of 34 of these taxa are reported for the first time. Diploids and polyploids with six different basic chromosome numbers x=5, 6, 7, 8, 9 and 11 are described. Thirteen species of subgenus lhamnoxys were analysed and two new basic chromosome numbers were observed in diploid entities of this subgenus, x = 6 and x=9. The underground stem-bearing entities of Oxalis subgenus Oxalis studied (in sections Articulatae, Jonoxalis and Palmatifoliae) are mostly diploids and polyploids with a basic chromosome number x=7. Five species of section Carnosa are diploids with x = 9. In species of sections Rosea, Ortgieseae, Clematodes and Laxae the basic chromosome numbers x = 6, 7, 8 and 9 were observed. Groups of related species sharing the same chromosome number are discussed with the aim of improving the infrageneric delimitation of the genus. The basic chromosome number x=6 seems to be primitive in the genus and other basic chromosome numbers probably appeared several times in the course of chromosome evolution of Oxalis .  相似文献   

14.
The chromosome numbers of 75 species belonging to the family Araceae have been determined. The numbers for 53 species are reported for the first time. One number differs from previous reports ( Aglaodorum ), and one number is corrected (Phymatarum). Within 15 genera ( Gymnostachys, Pothoidium, Alloschemone, Heteropsis, Holochlamys, Anaphyllopsis, Dracontioides, Pseudohydrosme, Montrichardia, Bucephalandra, Taccarum, Asterostigma, Gorgonidium, Spathantheum and Ulearum ) the chromosome numbers have not previously been determined. The total number of genera cytologically investigated is now 99 (c. 94%).
A great diversity in chromosome numbers as well as in chromosome size and constitution is found. The results are discussed in relation to the phylogeny and the previously published classifications of the family.
A total list of chromosome numbers counted (>700 species) in the Araceae is presented (Appendix).  相似文献   

15.
This paper presents the results of a karyological analysis of 14 species ofAlchemilla L. collected from SW Europe (Spain and French Pyrenees). About 75% of the analyzed species have chromosome numbers 2n = 95–136. A few species have lower chromosome numbers. The chromosome numbers of 13 species are presented for the first time.  相似文献   

16.
Cytological observations on eleven species of Ophioglossum revealed low gametic ( n ) chromosome numbers of 30, 34 and 60 in populations of O.eliminatum , contrasting with an earlier report of n = 90 in the same species. The rest of the species is based on n =120.Cytologically studied species of Ophioglossum exhibit a range of chromosome numbers from n = 30 in O.eliminatum to n =720 in O.reticulatum. The weighted highest common factor (HGF) from all the reported chromosome numbers in twelve species was found to be 30. This number is proposed as the palaeobasic chromosome number for the genuS. Reported chromosome numbers which are not multiples of 30 were subjected to sequential analysis, yielding three distinct ultimate base numbers, 4, 5 and 6, which can produce n = 30 in seven different ways. The neobasic number, n= 120, appears to have arisen through various combinations and permutations of these, theoretically 2401 routes; only a relatively few of these routes exist today, suggesting that extreme selection has been exerted against the majority, and further suggesting that Ophioglossum represents an evolutionary dead end through repeated cycles of polyploidy and is possibly at the verge of extinction. The stoichiometric model of evolution, which derives the various chromosome numbers possessed by the twelve species from the basic and ultimate basic chromosome numbers, is used to explain chromosomal evolution in the genus.  相似文献   

17.
染色体数目和倍性是系统与进化生物学和遗传学研究中十分重要的基础信息。为探索半蒴苣苔属染色体制片的适宜条件以及染色体数目的进化模式及其与物种的进化关系,该研究基于半蒴苣苔属染色体数目的进化历史,并根据该属植物具有叶片扦插繁殖的特性,采用叶片水培生根法获取半蒴苣苔(Hemiboea subcapitata)、弄岗半蒴苣苔(H.longgangensis)、龙州半蒴苣苔(H.longzhouensis)、江西半蒴苣苔(H.subacaulis var.jiangxiensis)、华南半蒴苣苔(H.follicularis)和永福半蒴苣苔(H.yongfuensis)6种植物的根尖材料,分析不同实验条件对染色体制片效果的影响,对染色体制片实验的条件进行优化及染色体计数,结果表明:(1)9:30—10:00取材,解离10 min以及染色15 min为半蒴苣苔属染色体制片的适宜条件。(2)上述6种半蒴苣苔属植物均为二倍体,染色体数目均为32(2n=2x=32)。(3)除个别物种染色体数目有变化以外,该属大部分物种染色体数目可能为2n=2x=32且染色体数目变化可能是非整倍化的作用,与物种进化没有明...  相似文献   

18.
横断山区被子植物染色体研究概况   总被引:1,自引:0,他引:1  
横断山区作为全球生物多样性热点地区之一 ,染色体数目的研究对探讨植物区系起源和进化有重要的意义。本文对横断山区被子植物染色体数目报道方面的情况进行收集和整理并进行统计分析 ,结果发现共有 42科 1 4 3属 51 8种被子植物有染色体数目报道。  相似文献   

19.
Some representatives of the bivalve family Sphaeriidae are assumed to be polyploid. In this study, 11 sphaeriid species (nine of the genus Pisidium, one of Musculium, and one of Sphaerium) inhabiting central Europe were studied karyologically, 10 of them for the first time. Analysis revealed high chromosome numbers (from 140 to 240). To elucidate the origin of high chromosome numbers, DNA contents were measured by flow cytometry in 5 of the studied species and, for comparison, in S. corneum and S. nucleus, which are known to be diploid (2n=30). Species with high chromosome counts yielded very similar DNA contents that are not higher than in the related species with low diploid numbers. This finding contradicts a possible origin of these species by recent polyploidization or hybridization of related species. Chromosome complements of the investigated species with high chromosome numbers differ from those with low 2n in their small chromosome size and the high proportion of subtelo- or acrocentric chromosomes. This indicates their possible origin either by an ancient polyplodization event followed by chromosomal rearrangements or by multiple chromosome fissions.  相似文献   

20.
以内蒙古草原3种针茅属植物为材料,常规压片法制片后观察记录染色体数,并进行核型分析。实验结果表明: 贝加尔针茅、大针茅和克氏针茅细胞染色体数均为2n=44,属于2A核型,为二倍体。在3种针茅的染色体中,中部着丝粒染色体占大多数平均为62.1%,其次近中部着丝粒染色体平均为28.9%,近端部着丝粒染色体较少约为9.0%。在3种针茅的第五号染色体上均有随体,表明起源于同一祖先。虽然染色体核型均属于较对称型,但是染色体不对称系数随着3种针茅分布生境的干旱程度的增加而逐渐增加,可能是长期适应与进化的结果。  相似文献   

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