Actinomycin-D and chiasma frequency in Schistocerca gregaria (Forsk�l)

Craig-Cameron, T.A.

doi:10.1007/bf00281998

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…Henderson (1962Henderson ( , 1963 demonstrated that a rise of temperature causes a decrease of chiasma number. Craig-Cameron (1970) observed significant differences in chiasma number between animals treated with actinomycin D and untreated ones. Shaw (1971) observed a fluctuation of chiasma number depending on age and on the temperature at which individuals were reared.…”

Section: Introductionmentioning

confidence: 81%

Influence of age on chiasma number in male Locusta migratoria

Díez

Puertas

1987

Genetica

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The influence of age on chiasma formation in Locusta migratoria has been studied both in wild-type and irradiated males. Samples were obtained on the one hand from different individuals and on the other hand from the same individuals at different ages through repeated biopsies. It was observed that mean chiasmata per cell decreased in ageing animals. Chi-squared tests and correlation coefficients showed that the decrease of chiasmata with age is progressive but not continuous. Intermediate values coincide with the first mating. It seems that older individuals tend to transmit their genetic combinations unaltered, increasing the probability of transmitting gene combinations of adaptive value.

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Section: Introductionmentioning

confidence: 81%

Influence of age on chiasma number in male Locusta migratoria

Díez

Puertas

1987

Genetica

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“…It has been observed that chemical compounds sometimes do not have any effect on the chiasm frequency or that they increase the frequency of chiasm. Actinomycin-D, whose effect on the two stocks of S. gregaria was investigated, was found to increase the chiasma frequency in the first stock which has a low chiasm frequency and that it has no effect on the chiasma frequency in the second stock which is normal [10]. 2,4-Dichlorophenoxy acetic acid (2,4-D) applied to S. gregaria by induction resulted in a reduction in the chiasm frequency, while 2,4-D given by injection to the abdomen did not cause any change on the chiasma frequency [11].…”

Section: Discussionmentioning

confidence: 99%

“…Various internal and external events are effective on meiosis and chiasma frequency. There are also chemical substances used for various purposes among them [10][11][12]. Chiasma frequency changed by chemical substances, can be used in genotoxic studies in addition to markers such as mitotic index or micronucleus formation.…”

Section: Introductionmentioning

confidence: 99%

The effects of boric acid and citric acid on chiasma frequency and meiotic division in Chorthippus loratus (Acrididae:Orthoptera) males

Koca

Türkoğlu

2020

Cumhuriyet Science Journal

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In this study, the cytogenetic effects of boric acid and citric acid in meiosis were investigated. Chorthippus loratus species of grasshoppers were treated with boric acid and citric acid sprayed grass at doses of 250, 500 and 1000 µg/ml for 24 hours. As a result of the investigations, it was observed that boric acid decreases chiasma frequency in doses of 500 and 1000 µg/ml. Differences between 250-500 and 250-1000 µg/ml doses were statistically significant. In the citric acid treated group, it was found that the frequency of chiasma decreased at doses of 500 and 1000 µg/ml. The differences were also significant between 250-500, 250-1000 and 500-1000 µg/ml doses. In our study, the effects of boric acid and citric acid on chiasma frequency as well as damages like the stickiness of chromosomes, breakage, fragment and anaphase bridge were observed.

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“…Chiasmata are the sites of crossing over where exchange of genetic material between paternal and maternal ones takes place. Chromosome breakage and reunion of DNA strands are the molecular mechanisms (Whittinghill 1955, Brown and Zohary 1955, Meselson and Weigle 1961, Meselson 1964, Jain and Basak 1963, Kale 1967, Peacock 1970, Craig-Cameron 1970 and include a series of interrelated processes some or all of which could be affected by physical and chemical agents in identical patterns (Bateman 1968, Kale 1971, Westerman 1971, Suzuki 1965, Sing and Jain 1979.…”

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confidence: 99%