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

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Chiasma distribution and centromere orientation in a spontaneous interchange in the grasshopper Chorthippus vagans 流浪蝗自发交换中的交叉分布和着丝粒取向
Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-12-01 DOI: 10.1139/G86-127
J. Cabrero, J. Camacho
{"title":"Chiasma distribution and centromere orientation in a spontaneous interchange in the grasshopper Chorthippus vagans","authors":"J. Cabrero, J. Camacho","doi":"10.1139/G86-127","DOIUrl":"https://doi.org/10.1139/G86-127","url":null,"abstract":"One of 18 Chorthippus vagans males from a natural population was heterozygous for an interchange between the L1 and M4 chromosomes when examined cytologically. Chiasma distribution within multiple chromosome configurations and the relation between chiasma formation in the interstitial segments and centromere orientation were investigated. Our results confirm previous observations that adjacent-2 is the most common orientation in absence of chiasmata on the interstitial segments.Key words: Chorthippus, interchange, interstitial segments, chiasma distribution, orientation.","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"59 1","pages":"913-920"},"PeriodicalIF":0.0,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79921028","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: 0
Ascus development in two temperature-sensitive four-spore mutants of Neurospora crassa. 两个对温度敏感的四孢子粗神经孢子突变体的子囊发育。
Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-12-01 DOI: 10.1139/g86-136
N B Raju
{"title":"Ascus development in two temperature-sensitive four-spore mutants of Neurospora crassa.","authors":"N B Raju","doi":"10.1139/g86-136","DOIUrl":"https://doi.org/10.1139/g86-136","url":null,"abstract":"<p><p>Two nonallelic Four-spore mutants are known in which ascospore walls enclose the four immediate products of meiosis rather than the normal eight products of a postmeiotic mitosis. Expression depends on temperature. The Four-spore phenotype is expressed when the developing asci are subjected either to high temperatures (25-30 degrees C) for Fsp-1 or to low temperatures (15-20 degrees C) for Fsp-2. Heterozygous Fsp-1 X Fsp-1+ crosses make eight-spored asci at 15-20 degrees C but produce many four-spored asci at 25 degrees C and mostly four-spored asci at 30 degrees C. Homozygous Fsp-1 X Fsp-1 crosses respond similarly to increasing temperature but make 40-50% four-spored asci even at 20 degrees C. Heterozygous Fsp-2 X Fsp-2+ crosses produce almost exclusively four-spored asci at 15 degrees C but a mixture of four- and eight-spored asci at 20, 25, and 30 degrees C. Homozygous Fsp-2 X Fsp-2 crosses make all four-spored asci at 15 and 20 degrees C and a mixture of four- and eight-spored asci at 25 and 30 degrees C. When both Fsp-1 and Fsp-2 are present in a cross, either homozygous or heterozygous, no asci contain more than four ascospores at any temperature. Limited temperature-shift experiments with Fsp-1 and Fsp-2 show that the sensitive period for Four-spore expression is sometime after meiotic prophase, possibly at interphase II.</p>","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"28 6","pages":"982-90"},"PeriodicalIF":0.0,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1139/g86-136","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14085911","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: 15
Genetic and demographic effects of single wild-type immigrants on a mutant population of Tribolium castaneum 单一野生型移民对木犀草突变群体的遗传和人口统计学影响
Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-12-01 DOI: 10.1139/G86-139
Michael A. Delgado, D. C. Englert
{"title":"Genetic and demographic effects of single wild-type immigrants on a mutant population of Tribolium castaneum","authors":"Michael A. Delgado, D. C. Englert","doi":"10.1139/G86-139","DOIUrl":"https://doi.org/10.1139/G86-139","url":null,"abstract":"The effects of single wild-type immigrants on populations of Tribolium castaneum initially homozygous for the antennapedia (ap) allele were examined in reference to gene frequencies and age structu...","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"115 1","pages":"1003-1008"},"PeriodicalIF":0.0,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75465768","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: 1
Nature of sterility and mechanism of the evolution of higher ploidy in Solanum section Solanum (Maurella) 龙葵(Solanum, Maurella)不育性的性质及高倍性的进化机制
Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-12-01 DOI: 10.1139/G86-146
A. Ganapathi, G. R. Rao
{"title":"Nature of sterility and mechanism of the evolution of higher ploidy in Solanum section Solanum (Maurella)","authors":"A. Ganapathi, G. R. Rao","doi":"10.1139/G86-146","DOIUrl":"https://doi.org/10.1139/G86-146","url":null,"abstract":"Cytomorphology of solanum nigrum L. (2n = 6x = 72) and S. americanum Mill. (2n = 2x = 24) was studied. Crosses were made between these two species, but crosses were successful only when the higher ploidy form was used as the maternal parent. The F1 hybrid was a tetraploid (2n = 4x = 48) and showed highly irregular meiosis. It did not set fruit either on selfing or on open pollination. A fertile octoploid branch spontaneously grew from the sterile hybrid. The octoploid had regular meiosis and produced several fruits with viable seeds. Pollen stainability was 82%. From cytological studies of the tetraploid and its amphiploid, it is concluded that hybridization and polyploidy have played a significant role in the origin and evolution of higher chromosomal forms of Solanum section Solanum (Maurella).Key words: Solanum, polyploid, sterility.","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"50 1","pages":"1044-1048"},"PeriodicalIF":0.0,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74945494","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: 3
Genetics of Glossina morsitans morsitans (Diptera: Glossinidae). XII: Comparison of field-collected and laboratory-reared flies 标题舌蝇的遗传学(双翅目:舌蝇科)。十二:野外采集蝇与实验室饲养蝇的比较
Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-12-01 DOI: 10.1139/G86-141
R. Gooding, A. Jordan
{"title":"Genetics of Glossina morsitans morsitans (Diptera: Glossinidae). XII: Comparison of field-collected and laboratory-reared flies","authors":"R. Gooding, A. Jordan","doi":"10.1139/G86-141","DOIUrl":"https://doi.org/10.1139/G86-141","url":null,"abstract":"Adult Glossina morsitans morsitans Westwood emerging from puparia collected at Rekometjie, Zimbabwe, were compared at 13 loci with G. m. morsitans from a closed colony at the Tsetse Research Labortory (TRL), University of Bristol, by polyacrylamide gel electrophoresis. The populations were not significantly different with respect to mean heterozygosity per locus, average effective number of alleles per locus, number of polymorphic loci, or allele frequencies at 12 loci. (The exception was Alkph.) Rare alleles at To, Est-t, and Alkph were found only in Rekometjie flies while rare alleles at G6pd and Est-2 were found only in TRL flies. No significant level of sterility was found in F1 flies produced in reciprocal crosses of Rekometjie flies with G. m. morsitans from the University of Alberta colony.Key words: Glossina, tsetse fly, isozymes, heterozygosity.","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"471 1","pages":"1016-1021"},"PeriodicalIF":0.0,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85576502","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: 18
Cytogenetics of the acrotrisomic 5S5L in barley 大麦体细胞体5S5L的细胞遗传学研究
Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-12-01 DOI: 10.1139/G86-143
A. Shahla, T. Tsuchiya
{"title":"Cytogenetics of the acrotrisomic 5S5L in barley","authors":"A. Shahla, T. Tsuchiya","doi":"10.1139/G86-143","DOIUrl":"https://doi.org/10.1139/G86-143","url":null,"abstract":"An acrotrisomic plant was identified in the progeny of a telotrisomic for 1S. The acrocentric chromosome had a complete short arm (5S) and 40% of the proximal segment of the long arm (5L). Morphology of the acrotrisomic 5S5L was similar to the primary trisomic (triplo 5) and triplo 5L. At meiosis the acrocentric 5S5L either paired with its normal homologues forming a trivalent or remained as a univalent. Seed fertility was high. Transmission of the acrocentric was 37.6% through the female and 9% through the male. Genetic tests showed that fs2 and g were located in this 40% proximal segment of the 5L. Gene f3 showed a trisomic ratio with acrotrisomic 5S5L, but its arm location is not known. Two genes, f7 and trd, were located on the 60% distal segment of the 5L. The segregation ratio with gene int-a1 was also disomic but it could not be assigned to the 60% distal segment because its location on chromosome 5 is questionable at this time. This experiment demonstrates the usefulness of acrotrisomics in physic...","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"42 1","pages":"1026-1033"},"PeriodicalIF":0.0,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77262851","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: 9
Chromosomes in 'Cadet' and 'Rescue' wheats carrying loci for cold hardiness and vernalization response 'Cadet'和'Rescue'小麦的染色体携带抗寒性和春化反应位点
Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-12-01 DOI: 10.1139/G86-137
D. Roberts
{"title":"Chromosomes in 'Cadet' and 'Rescue' wheats carrying loci for cold hardiness and vernalization response","authors":"D. Roberts","doi":"10.1139/G86-137","DOIUrl":"https://doi.org/10.1139/G86-137","url":null,"abstract":"'Rescue', 'Cadet', and the 42 reciprocal chromosome substitution lines derived from these two spring wheat cultivars were tested for vernalization response and cold hardiness. Cold hardiness was tested after hardening under a 16-h day for 8 weeks with 6 °C day and 4 °C night temperatures or in the dark for 7 weeks at 0.8 °C followed by 8 weeks at −5 °C. Chromosomes 5A, 5B, 7B, and possibly 2A carried loci for vernalization response. Chromosomes 2A, 5A, and 5B carried loci affecting cold hardiness measured after 8 weeks in the light at 6 °C during the day and 4 °C at night, whereas chromosomes 6A, 3B, 5B, and 5D were involved in cold hardiness after hardening in the dark at 0.8 °C followed by −5 °C. The results suggest that the rank order of cultivars for cold hardiness depends on the hardening technique used since the two different techniques tested had different genetic and presumably somewhat different biochemical bases.Key words: Triticum aestivum L., cold hardiness, vernalization.","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"41 1","pages":"991-997"},"PeriodicalIF":0.0,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90186672","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: 30
Cytogenetic studies of interspecific hybrids between diploid species of Festuca 羊茅二倍体种间杂种的细胞遗传学研究
Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-12-01 DOI: 10.1139/G86-128
W. Morgan, H. Thomas, M. Evans, M. Borrill
{"title":"Cytogenetic studies of interspecific hybrids between diploid species of Festuca","authors":"W. Morgan, H. Thomas, M. Evans, M. Borrill","doi":"10.1139/G86-128","DOIUrl":"https://doi.org/10.1139/G86-128","url":null,"abstract":"Chromosome pairing in hybrids between diploid species of Festuca is described. The chromosome complements of the species from different taxonomic sections vary in chromosome size and DNA content. In interspecific hybrids involving species of the section Montanae there was a relationship between the difference in DNA content of the parental species and chromosome pairing in the F1 hybrids. The larger the difference between the DNA content of the parental species, the more pronounced the failure of chromosome pairing in the F1 hybrids. Factors other than divergence in genome size were also shown to have an effect on chromosome pairing in other hybrid combinations.Key words: chromosome pairing, DNA content, Festuca, hybrids (interspecific).","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"54 1","pages":"921-925"},"PeriodicalIF":0.0,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89054140","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: 10
Inheritance of earliness, height, and leaf number in crosses of early maturing rapeseed 早熟油菜籽早熟性、高、叶数的遗传
Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-12-01 DOI: 10.1139/G86-140
E. A. Ringdahl, P. McVetty, J. L. Sernyk
{"title":"Inheritance of earliness, height, and leaf number in crosses of early maturing rapeseed","authors":"E. A. Ringdahl, P. McVetty, J. L. Sernyk","doi":"10.1139/G86-140","DOIUrl":"https://doi.org/10.1139/G86-140","url":null,"abstract":"A dwarf early Brassica napus line (D-001), derived from crosses with Diplotaxis muralis, was crossed to two B. napus cultivars, 'Regent' and 'Pivot' to study the inheritance of earliness (days to bud, days to first flower, and days to maturity), height, and leaf number. Spaced plants of P1, P2, F1, F2, BC1, and BC2 generations for both crosses were grown in a completely randomized design at two locations in Manitoba in 1984. Results of means analyses indicated that additive gene action predominated for all traits for both crosses and both locations. In addition, dominance gene action was found to influence days to first flower, days to maturity, and leaf number for the D-001 × 'Regent' cross and all traits for the D-001 × 'Pivot' cross. Nonallelic interactions were nonsignificant in all cases. Genotype × environment interactions were not significant for all traits except height. Variance analyses indicated a predominance of additive gene action. Broad sense heritabilities for phenological traits ranged fr...","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"1 1","pages":"1009-1015"},"PeriodicalIF":0.0,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77201247","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: 6
Genetic load and heterozygosity in the Pinaceae 松科植物的遗传负荷与杂合性
Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie Pub Date : 1986-12-01 DOI: 10.1139/G86-131
T. Mitchell-Olds, R. Guries
{"title":"Genetic load and heterozygosity in the Pinaceae","authors":"T. Mitchell-Olds, R. Guries","doi":"10.1139/G86-131","DOIUrl":"https://doi.org/10.1139/G86-131","url":null,"abstract":"Lethal genetic load might be caused by a few lethal genes or by large numbers of mildly deleterious polygenes. The extent of this lethal load can be quantified as the number of \"lethal equivalents\"...","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"1 1","pages":"942-946"},"PeriodicalIF":0.0,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87435174","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: 10
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