SEX AND CROSSING OVER IN LINKAGE GROUP III OF TRIBOLIUM CASTANEUM

The relative position of the genes black (b), light ocular diaphragm (lod) and aureate (au) for the third linkage group of T. castaneum (Herbst) (Coleoptera, Tenebrionidae) has been determined as b – lod – au. The distances between the various genes vary, depending on the cross. The b++/+ lod au ♂ × + lod au/+ lod au ♀ crosses give the following recombination values: au – lod = 18.32 ± 1.21%; b – lod = 21.05 ± 1.51% and b – au = 37.43 ± 1.27%. The reciprocal crosses give au – lod = 27.67 ± 1.62%; b – lod = 13.97 ± 1.26% and b – au = 39.79 ± 1.78%. For the larger distances encompassed in the b – au region the recombination values in the two sexes were not significantly different. For the shorter b – lod region the recombination values were significantly larger in the females than in the males, while for the adjacent lod – au region the opposite was true. On the basis of the current literature it would appear that the main factors contributing to these sex differences in recombination are the modifiers which are different in the genetic background of the two sexes.

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Linkage of the reindeer and alate prothorax loci and sex differences in recombination frequency in linkage group IX of Tribolium castaneum

Canadian Journal of Genetics and Cytology ◽

10.1139/g85-041 ◽

1985 ◽

Vol 27 (3) ◽

pp. 276-278

Author(s):

Peter S. Dawson ◽

Kelly L. Berends

Keyword(s):

Sex Differences ◽

Linkage Group ◽

Tribolium Castaneum ◽

Autosomal Dominant ◽

Recombination Frequency ◽

Flour Beetle ◽

The Third ◽

Dominant Mutant

Reindeer (Rd), an autosomal dominant mutant in the flour beetle, Tribolium castaneum, is located in linkage group IX. Recombination between Rd and alate prothorax occurs more frequently in males than in females. Linkage group IX appears to be the third linkage group for which recombination frequency is greater in males for one region and in females for another region of the chromosome.Key words: Tribolium, linkage.

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LINKAGE STUDIES IN TRIBOLIUM CASTANEUM. XI. THE MAP POSITION OF CHARCOAL, A PSEUDOALLELE OF BLACK

Canadian Journal of Genetics and Cytology ◽

10.1139/g78-014 ◽

1978 ◽

Vol 20 (1) ◽

pp. 139-145 ◽

Cited By ~ 2

Author(s):

Eric Brown ◽

Alexander Sokoloff

Keyword(s):

Linkage Group ◽

Tribolium Castaneum ◽

Reciprocal Cross ◽

Autosomal Dominant ◽

Linkage Studies ◽

Lethal Effects ◽

Recessive Lethal ◽

Reciprocal Crosses ◽

Group Iii ◽

Significant Difference

Charcoal, (Chr), an autosomal dominant with recessive lethal effects is located in linkage group III in Tribolium castaneum (Herbst). Its map position has been determined in respect to aureate (au), light ocular diaphragm (lod) and black (b). The distances between the various genes vary, depending on the sex of the cross. The Chr ++/+ lod au ♂ × +lod au/+lod au ♀ crosses give the following recombination values: au-lod = 22.19 ±.42%, Chr-lod = 20.03 ±.40% and Chr-au = 41.28 ±.49%. The reciprocal crosses give au-lod 28.08 ±.45%, Chr-lod = 17.67 ±.38% and Chr-au = 44.11 ±.50%. For the larger distances encompassed by the Chr-au region the recombination values in the two sexes were not significantly different. For the shorter distances the recombination values were significantly higher in the males than in the females in the au-lod region. They were not found to be significantly different in the Chr-lod region probably because of difficulty in identifying lod and non-lod beetles in the presence of Chr. Tests of allelism indicate that Chr and black b are pseudoalleles which recombine at a different rate in the two sexes. Chr +/+b ♂ × +b/+b ♀ gave 0.07% recombinants, while the reciprocal cross gave 0.014% recombinants, a significant difference. The data suggest that the order of the genes in this linkage group is Chr - b - lod - au.

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A CROSSOVER SUPPRESSOR-ENHANCER SYSTEM IN THE MOSQUITO AEDES AEGYPTI

Canadian Journal of Genetics and Cytology ◽

10.1139/g71-081 ◽

1971 ◽

Vol 13 (3) ◽

pp. 561-577 ◽

Cited By ~ 6

Author(s):

Satish C. Bhalla

Keyword(s):

Linkage Group ◽

Reciprocal Translocation ◽

Paracentric Inversion ◽

Chromosome 1 ◽

Crossing Over ◽

Linkage Groups ◽

Group Iii ◽

Partial Sterility ◽

The Right ◽

And Inversion

A small reciprocal translocation T(1;2)1 involving chromosomes 1 and 2 and a paracentric inversion In(1)3 on m chromosome (1) of A. aegypti interact to give peculiar but consistent crossover values. The system is termed COSES and is associated with partial sterility. In females it suppresses crossing over tremendously to the right of bz and enhances crossing over to its left. In the males it enhances crossing over to the right of m (only 3 crossover units away from bz) hut the region to its left remains unaffected. COSES also displays interchromosomal effects by enhancing crossing over in linkage group III. Cytological and genetic evidence for the presence of translocation and inversion are presented. All three pairs of chromosomes are correlated to the three linkage groups.

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Recombination block in the Spore killer region of Neurospora

Genome ◽

10.1139/g87-022 ◽

1987 ◽

Vol 29 (1) ◽

pp. 129-135 ◽

Cited By ~ 28

Author(s):

Joseph L. Campbell ◽

Barbara C. Turner

Keyword(s):

Linkage Group ◽

Chromosome Rearrangement ◽

Meiotic Drive ◽

Structural Basis ◽

Crossing Over ◽

Homologous Pairing ◽

Group Iii ◽

Normal Crossing ◽

Selective Plating ◽

Spore Killer

Spore killers Sk-2K and Sk-3K are chromosomal meiotic drive factors in Neurospora. In heterozygous crosses, ascospores not contining the Spore killer die. Sk-2K and Sk-3K, which differ in killing specificity, were found to be associated with suppression of recombination in a centromere-spanning region of linkage group III, and investigation of that recombination block is reported here. The block covers a region that is normally 30 to 40 map units long. A locus (r(Sk-2)) conferring resistance to Sk-2K maps to the left end of the recombination block. Recombination is normal in r(Sk-2) × Sk sensitive but blocked in Sk-2K × r(Sk-2); so the block does not depend upon killing. By selective plating, SkK stocks carrying genetic markers within the block were obtained at frequencies on the order of 10−5 or 10−6. Since this tight block is far beyond what has been observed for genetic reduction of recombination, a structural basis is assumed. No evidence of chromosome rearrangement was obtained. Crosses homozygous for Sk-2K show normal crossing-over and map order for the flanking markers cum and his-7 and three included markers (acr-7, acr-2, and leu-1). Results would be consistent with a divergence of sequence great enough to interfere with homologous pairing. Key words: meiotic drive, Neurospora, crossover suppressor.

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Crossing Over in the Third Linkage Group in Oenothera

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.13.1.21 ◽

1927 ◽

Vol 13 (1) ◽

pp. 21-24 ◽

Cited By ~ 4

Author(s):

G. H. Shull

Keyword(s):

Linkage Group ◽

Crossing Over ◽

The Third

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SEX AND CROSSING OVER IN LINKAGE GROUP IV OF TRIBOLIUM CASTANEUM

Genetics ◽

10.1093/genetics/72.3.525 ◽

1972 ◽

Vol 72 (3) ◽

pp. 525-530

Author(s):

Peter S Dawson

Keyword(s):

Linkage Group ◽

Tribolium Castaneum ◽

Group Iv ◽

Crossing Over

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The First Two Cases of Crossing-Over between Old-Gold and Bullata Factors in the Third Linkage Group of Oenothera

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.16.2.106 ◽

1930 ◽

Vol 16 (2) ◽

pp. 106-109 ◽

Cited By ~ 5

Author(s):

G. H. Shull

Keyword(s):

Linkage Group ◽

Crossing Over ◽

The Third

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The basis of decreased recombination in certain outcrosses of Neurospora crassa

Genome ◽

10.1139/g92-074 ◽

1992 ◽

Vol 35 (3) ◽

pp. 503-509 ◽

Cited By ~ 7

Author(s):

David D. Perkins ◽

Maja Bojko

Keyword(s):

Linkage Group ◽

Genetic Background ◽

Wild Strain ◽

Laboratory Strain ◽

Crossing Over ◽

Group I ◽

Marked Chromosome ◽

Inbred Laboratory Strain ◽

High Level ◽

Chromosome Segments

Crossing over in a multiply marked segment of linkage group I was conspicuously reduced in outcrosses between a marked laboratory strain and each of six unrelated wild-collected strains, compared with crosses between inbred laboratory strains. The marked chromosome segment was transferred intact from the inbred strain to one of the wild-collected strains by seven recurrent backcrosses, and conversely, the corresponding segment of the wild strain was transferred to the inbred background by backcrossing to the multiply marked laboratory strain. Recombination was then monitored in crosses from parents having the marked and unmarked chromosome segments from the same or from unrelated sources. Meiotic crossing-over in the marked segment remained low in crosses between parents that were dissimilar with respect to genetic background, but crossing over was restored to a high level when the genetic background of both parents was that of the inbred laboratory strain, regardless of the source of the marked segments. Reduced recombination in outcrosses was therefore not due to heterologies in the marked segment but must be attributed to modifiers that are unlinked or distant from the monitored region.Key words: recombination, recombination control, crossing over, Neurospora.

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Efficacy of some indigenous plants and a synthetic insecticide for the control of Tribolium castaneum (herbst.) (coleoptera: tenebrionidae)

International Journal of Bioassays ◽

10.21746/ijbio.2016.01.008 ◽

2016 ◽

Vol 5 (01) ◽

pp. 4742

Author(s):

Mumtaz Akhtar ◽

Naheed Akhtar* ◽

Muhammad Arshad ◽

Naima Iram ◽

Muhammad Iqbal ◽

...

Keyword(s):

Tribolium Castaneum ◽

Eucalyptus Camaldulensis ◽

Ethanol Extract ◽

Cumulative Effects ◽

Piper Nigrum ◽

Paper Test ◽

Indigenous Plants ◽

Synthetic Insecticide ◽

Insecticidal Action ◽

Coleoptera Tenebrionidae

Research studies were carried out to evaluate insecticidal action of two plant products and a synthetic insecticide on a major stored-product insect, Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae). The plant species studied were, Piper nigrum and Eucalyptus camaldulensis, whereas methoprene used as synthetic insecticide. Two formulations viz., powder and ethanol extract of each plant and four concentrations (5ppm, 10ppm, 15ppm and 20 ppm) of methoprene were tested. Repellency was tested using the filter paper test whereas mortality, weight loss protection and anti-feedant potential of all treatments was evaluated by using whole maize grains. Our results were highly significant as compared to control however; P. nigrum was more effective as compared to E. camaldulensis. The investigation of cumulative effects of botanical and synthetic insecticide and isolation of active ingredients of botanicals are further issues to be investigated for their inclusion in. I. P. M programs.

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