The Parasitoid Wasps, Habrobracon and Mormoniella

Cassidy, Joseph D.

doi:10.1007/978-1-4615-7145-2_7

Cited by 4 publications

(3 citation statements)

References 165 publications

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“…Each treatment vial was provisioned with a single host caterpillar. Although foundresses remained in the treatment vials for life and could continue to lay eggs for several weeks if supplied with fresh hosts, sample counts indicated that ovipositing on the same host ceased after about 30 hours, coincident with the time wasp larvae hatch from eggs (Cassidy, 1975). This is consistent with the observation that Bracon females prefer fresh hosts to those previously parasitized (Hagstrom and Smittle, 1978), possibly because ofcannibalism among wasp larvae (Grosch, 1948;Rotary and Gerling, 1973).…”

Section: Methodssupporting

confidence: 71%

“…Solitary outbred Bracon females typically produce twice as many daughters as sons (Horn, 1943;Whiting, 1943;Whiting, 1961;Cassidy, 1975), although Grosch (1948) cautions that the 2: I fertilization rate is not invariant. The haplodiploid mechanism of sex determination is complicated in Bracon by complementary alleles at an x locus: unfertilized eggs yield normal males; fertilized eggs develop as females if heterozygous at the x locus, but as diploid males if homozygous 'Present address: Department of Biochemistry, Georgetown University, Wash., DC 20007.…”

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confidence: 99%

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REVERSE SEX-RATIO ADJUSTMENT IN AN APPARENTLY OUTBREEDING WASP,BRACON HEBETOR

Galloway

Grant

1989

Evolution

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Section: Methodssupporting

confidence: 71%

mentioning

confidence: 99%

REVERSE SEX-RATIO ADJUSTMENT IN AN APPARENTLY OUTBREEDING WASP,BRACON HEBETOR

Galloway

Grant

1989

Evolution

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“…While most studies, especially those concerned about genetics and developmental biology, have been carried out using the species in the advanced suborder Apocrita (DuPraw, 1967;Cassidy, 1975;Rothenbuhler, 1975), we believe that the lower suborder Symphyta provides better materials for studies on such subjects as egg maturation, activation, fertilization, and on meiotic divisions. For example, mature eggs explanted from adult females of the sawflies in the Family Tenthredinidae (Symphyta) can be activated in vitro simply by placing them in distilled water (Naito, 1982); in at least one species, Athalia rosae, diploid males can be easily obtained who show non-reductional maturation division and produce diploid sperm (Naito & Suzuki, 1991).…”

Section: Introductionmentioning

confidence: 98%

Genetics and biology of the sawfly,Athalia rosae (Hymenoptera)

et al. 1993

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Hymenopteran insects are a unique group of animals in which arrhenotokous reproduction (haploid males develop from unfertilized eggs) is a rule. Males produce sperm through a non-reductional maturation division. A sawfly species, Athalia rosae ruficornis Jakovlev Tenthredinidae, Symphyta, Hymenoptera) has introduced as a new experimental material for studies on genetics and developmental biology. Basic features relating to the potential usefulness of the species in elucidating some to the important genetic and developmental biological problems are described.

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Evidence for dosage compensation in parthenogenetic Hymenoptera

1977

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Amounts of DNA-Feulgen staining in individual somatic nuclei and mature sperm of the parthenogenetic wasps, Habrobracon juglandis, H. serinopae, and Mormoniella vitripennis, were determined with a scanning microdensitometer. The haploid genome for both species of Habrobracon was estimated to be 0.15-0.16 X 10-(12) gDNA, corresponding to a molecular weight of roughly 10 X10(10) daltons. The haploid genome of M. vitripennis is approximately twice this value, 0.33-0.34 X 10-(12) g, or about 20X10(10) daltons. Measurements made on dividing nuclei from syncytial preblastoderm embryos of H. juglandis and M. viripennis showed that the chromosomes of impaternate males were present in the haploid number and contained the C amount of DNA; whereas nuclei from female preblastoderm embryos contained the diploid number of chromosomes and the 2C amount of DNA. However, hemocyte and brain cell nuclei from either male or female adult wasps contained 2C and 4C amounts of DNA. Both sexes also showed equivalent levels of polyploidy (8C, 16C, or 32C) in Malpighian tubule nuclei. Therefore, in these parthenogenetic species,, a mechanism must exist the compensates during later development for the initial two-fold difference in the chromatin content of somatic nuclei in haploid male and diploid female embryos. Hemocytes from impaternate Mormoniella diploid males and triploid females contain the 2C and 3C amounts of DNA, respectively Therefore dosage compensation involves an additional cycle of DNA replication only in hapoid cells, and it insures that a certain minimum quantity of DNA is received by each somatic cell.

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The Parasitoid Wasps, Habrobracon and Mormoniella

Cited by 4 publications

References 165 publications

REVERSE SEX-RATIO ADJUSTMENT IN AN APPARENTLY OUTBREEDING WASP,BRACON HEBETOR

REVERSE SEX-RATIO ADJUSTMENT IN AN APPARENTLY OUTBREEDING WASP,BRACON HEBETOR

Genetics and biology of the sawfly,Athalia rosae (Hymenoptera)

Evidence for dosage compensation in parthenogenetic Hymenoptera

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