Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie最新文献_第8页

Reproduction and the origin of polyploids in hybrid salamanders of the genus Ambystoma. 杂交蝾螈属多倍体的繁殖和起源。

Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-08-01 DOI: 10.1139/g86-089

J P Bogart, L E Licht

{"title":"Reproduction and the origin of polyploids in hybrid salamanders of the genus Ambystoma.","authors":"J P Bogart, L E Licht","doi":"10.1139/g86-089","DOIUrl":"https://doi.org/10.1139/g86-089","url":null,"abstract":"Eggs and larvae produced by diploid, triploid, and tetraploid females collected from breeding ponds on Pelee Island in Lake Erie were studied to examine the reproductive mechanism. No instance of parthenogenesis was found as all examined females required sperm to produce viable progeny. Diploid females produced diploid and triploid larvae, triploid females produced triploid and tetraploid larvae, and tetraploid females produced triploid and tetraploid larvae. The majority of the eggs produced by hybrid females do not develop or do not complete embryogenesis. Electrophoretic examination of females and their offspring demonstrate that the male genome is being incorporated in reduced as well as unreduced eggs produced by all three ploidy classes of females. The elevation of ploidy among Pelee Island Ambystoma is attributed to sperm incorporation in unreduced eggs. Triploid as well as tetraploid individuals are constantly being produced. A critical examination of the literature on parthenogenetic or gynogenetic modes of reproduction in North America Ambystoma hybrids shows no conclusive evidence supporting these modes and it is suggested that the reproductive mechanism found among Pelee Island female hybrids may be more generally applied to other hybrid Ambystoma populations.","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"28 4","pages":"605-17"},"PeriodicalIF":0.0,"publicationDate":"1986-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1139/g86-089","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14874906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 57

Inheritance and microsporogenesis of a synaptic mutant (sy-2) from Solanum commersonii Dun. 龙葵突触突变体sy-2的遗传与小孢子发生。

Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-08-01 DOI: 10.1139/G86-076

S. Johnston, R. W. Ruhde, M. Ehlenfeldt, R. Hanneman

引用次数: 16

Relationships between floret size and grain weight in aneuploid lines of homoeologous group-5 chromosomes of common wheat (Triticum aestivum L.) cv. Chinese Spring 普通小麦(Triticum aestivum L.)同源组5染色体非整倍体系小花大小与粒重的关系。中国的春天

Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-08-01 DOI: 10.1139/G86-073

E. Millet

引用次数: 5

Partial amphiploids from wheat (Triticum aestivum) × rye (Secale cereale) crosses 小麦(Triticum aestivum)与黑麦(Secale cereale)杂交的部分两倍体

Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-08-01 DOI: 10.1139/G86-091

P. Gupta, G. Fedak

引用次数: 2

The karyotype of the grass Zingeria biebersteiniana (2n = 4) by light and electron microscopy 用光镜和电镜观察了2n = 4的草地姜草的核型

Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-08-01 DOI: 10.1139/G86-081

M. D. Bennett, J. B. Smith, A. Seal

引用次数: 14

Chromosome banding in salmonid fishes: nucleolar organizer regions in Oncorhynchus. 鲑科鱼类的染色体带化:鲑科鱼类的核仁组织区。

Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-08-01 DOI: 10.1139/g86-074

R B Phillips, K D Zajicek, F M Utter

{"title":"Chromosome banding in salmonid fishes: nucleolar organizer regions in Oncorhynchus.","authors":"R B Phillips, K D Zajicek, F M Utter","doi":"10.1139/g86-074","DOIUrl":"https://doi.org/10.1139/g86-074","url":null,"abstract":"Chromosome banding patterns obtained by silver staining and chromomycin a3 (CMA3) staining were analyzed in six species of Oncorhynchus: O. tshawytscha, O. kisutch, O. keta, O. nerka, and O. gorbuscha from North America and O. masou from Japan. Four different chromosomal locations of the nucleolar organizer regions (NORs) were found in different species. In O. tshawytscha, O. kisutch, and O. masou the NORs comprised the entire short arms of one medium-sized acrocentric chromosome pair. In O. nerka the NORs were found in an interstitial band on the short arms of one submetacentric chromosome pair and in O. gorbuscha proximal to the centromere on one metacentric chromosome pair. In O. keta the NORs were found on the telomeres of one small submetacentric chromosome pair. As in the related genera Salmo and Salvelinus chromomycin A3 positive bands were found at the same sites as the AgNORs in all species. Salmonid fish are assumed to be ancestral tetraploids and the considerable differences in chromosome number between different species are thought to be the result of chromosomal fusions after tetraploidization. In all members of the genus Oncorhynchus the rearrangements have resulted in the consolidation of the NORs on a single chromosome pair. The possible significance of intra- and inter-species NOR polymorphisms is discussed.","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"28 4","pages":"502-10"},"PeriodicalIF":0.0,"publicationDate":"1986-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1139/g86-074","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14874984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 28

The influence of fixation on the morphology of mitotic chromosomes. 固定对有丝分裂染色体形态的影响。

Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-08-01 DOI: 10.1139/g86-078

A J Dietrich

{"title":"The influence of fixation on the morphology of mitotic chromosomes.","authors":"A J Dietrich","doi":"10.1139/g86-078","DOIUrl":"https://doi.org/10.1139/g86-078","url":null,"abstract":"It is well known that there is a strong influence of fixation, i.e., acetic methanol versus formaldehyde, on the chromosome morphology at stages of the first meiotic division. In this study the influence of both these types of fixation on the morphology of mitotic chromosomes was examined in human lymphocytes. After methanol-acetic acid (3:1) fixation, the chromosomes show the \"classical\" condensed shape in which it is not always possible to recognize the two sister chromatids. These chromosomes are accessible to the conventional G-, R-, and C-banding techniques. After formaldehyde fixation at a relatively high pH, the chromosomes are thinner and longer (two to six times) when compared with chromosomes following methanol-acetic acid fixation. They show a scaffold-like morphology, sometimes with a halo of thin material around it. In all cases the two sister chromatids could be recognized. This chromosome structure could be easily stained with silver, Giemsa, 4,6-diamino-2-phenyl-indole (DAPI), and fluorescein isocyanate isomere 1 (FITC). The results obtained following these stainings gave no indication to any specific chemical composition of a probable central scaffold. The scaffold-like structures were not accessible to G-, R-, or C-banding techniques. The only effect observed following these banding techniques was the disappearance of the halo of thin material around the central scaffold-like structure.","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"28 4","pages":"536-9"},"PeriodicalIF":0.0,"publicationDate":"1986-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1139/g86-078","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14653647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Linkage between the Lr10 gene conditioning resistance to leaf rust, two endosperm proteins, and hairy glumes in hexaploid wheat 六倍体小麦抗叶锈病Lr10基因、两种胚乳蛋白和多毛颖片的连锁关系

Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-08-01 DOI: 10.1139/G86-087

N. Howes

引用次数: 17

Chromosome instability in somaclones of a Triticum crassum × Hordeum vulgare hybrid 黑麦与黑麦杂种体细胞无性系的染色体不稳定性

Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-08-01 DOI: 10.1139/G86-090

G. Fedak, J. Grainger

引用次数: 16

Pairing competition between identical and homologous chromosomes in diploid and tetraploid cells of rye telotrisomic plants 黑麦端三体植物二倍体和四倍体细胞中相同染色体和同源染色体的配对竞争

Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-08-01 DOI: 10.1139/G86-083

E. Benavente, J. Orellana

引用次数: 4