Effects of supernumerary heterochromatin on chiasma condition in two species of Acrididae (Orthoptera)

Remis, María Isabel

doi:10.1007/bf00056065

Cited by 12 publications

(14 citation statements)

References 30 publications

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“…This effect is stable through time since it was also observed in previsous studies (LORAY et al 1991). The same holds for segments ss9 and ss.o, which also reduce the frequency of chiasmata in their neighbourhood (REMIS 1989;LoRAY et al 1991).…”

supporting

confidence: 69%

“…In Dichroplus elongatus, these chromosomes seem to be endemic of populations of Tucuman, since they are virtually absent in the rest of the Argentinian populations sampled so far (SEQUEIRA et al, submitted;REMis 1989). The frequency of this polymorphism seem to be rather stable through time since B frequency has not varied significantly through a period of 10 years in Raco (RA) and 5 years in Tafi Viejo (TV).…”

mentioning

confidence: 98%

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Supernumerary heterochromatin, chiasma conditions and abnormal sperm formation inDichroplus elongatus(Orthoptera): intra and interpopulation analysis

et al. 1994

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SUMMARY -Parallel polymorphisms for B chromosome and supernumerary segments on M,, s. and S,. pairs have been detected in two Argentinian populations of Dichroplus elongatus, Raco (RA) and Tafi Viejo (TV) (Tucuman Province). All these polymorphisms seem to be temporally stable. In all samples of TV, it was observed a tendency towards an excess of the B + SS, class. SS, produces a total restriction of chiasma formation in proximal position in the involved pair in heterozygous and homozygous males. In TV a consistent dose effect of B chromosome on interstitial chiasma (X;) frequency was detected in males. The X; frequency vs. number of supernumeraries plot fits to a linear regression. In both populations, the individuals with B's showed a significant increase in macro-and microspermatid production. This effect is more marked at RA. The cytophotometric analysis of DNA content revealed that in both types of males, B and non B carriers, most macrospermatids are diploid suggesting a probably origin by cytokinesis blocking. However, spermatids with 3 to 5C contents in B carriers were also detected showing that other mechanism (i.e. cell fusion) may also account to explain the effects of B's on abnormal sperm formation.

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supporting

confidence: 69%

mentioning

confidence: 98%

Supernumerary heterochromatin, chiasma conditions and abnormal sperm formation inDichroplus elongatus(Orthoptera): intra and interpopulation analysis

et al. 1994

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“…This effect was also rarely found among the Orthoptera. Indeed, only significant increases in chiasma frequencies were previously reported as in Myrmeleotettix maculatus UoHN andHEWITT 1965a, 1965b;HEWITT and JoHN 1970), Eyprepocnemis plorans (CAMA-CHO et al 1980), Euthystira brachyptera (FLETCHER and HEWITT 1980), Cylindrotettix obscurus (CoLOMBO 1989) and Amblytropidia australis (REMIS 1989).…”

Section: Discussionmentioning

confidence: 99%

B-chromosomes ofTrimerotropis pallidipennis(Oedipodinae, Acrididae): new effects on chiasma conditions

Confalonieri¹

1992

Caryologia

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1985;CoNFALONIERI 1988;CoNFALONIERI and CoLOMBO 1989). In the present paper, ten populations of this species distributed over several provinces of Argentina were analized with respect to chiasma conditions. Three populations showed a negative correlation between total and interstitial chiasma frequencies, but it was only apparent when B-carriers were excluded from the sample. This fact suggested that B-chromosomes would be interferring with the genetic control of chiasma formation. Besides, in two populations a significant drop of total chiasma frequencies from B-carriers with respect to non B-carriers was evident. Both modifications of chiasma conditions apparently influenced by the supernumerary chromosome have been rarely found among the Orthoptera. Interpopulational differences with respect to this effects are briefly discussed.

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“…Among grasshoppers there is often a basal level of abnormal spermatids (SUJA et al 1986); in addition to this, any chromosome alteration may increase this frequency (NUR 1969;}0HN and KING 1980;BIDAU 1986BIDAU , 1987BIDAU AND CONFALONIERI 1988: REMIS 1989aLORAY et a/. 1991).…”

Section: Discussionmentioning

confidence: 99%

“…In grasshoppers, several chromosome conditions as translocations, centric fusions, supernumerary chromosomes are associated with abnormal sperm formation (NuR 1969;JoHN and KING 1980;MoRAN 1981;PETERS 1982;BmAu 1986;1987, 1988BIDAU and CONFALONIERI 1988;REMIS 1989a;LORAY eta/. 1991).…”

Section: Introductionmentioning

confidence: 99%

Effects of chromosome rearrangements on sperm formation inSinipta dalmani(Orthoptera: Acrididae)

Remis

1993

Caryologia

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SUMMARY -The populations of National Park «El Palmar» (Entre Rios Province, Argentina) of Sinipta dalmani are polymorphic for a pericentric inversion and a centric fusion (REMIS 1989b(REMIS , 1990. The percentage of normal and abnormal (macro and micro) spermatids was asessed in order to evaluate the influence of these rearrangements on sperm formation. The pericentric inversion does not associate significantly with macrospermatid formation. On the contrary, microspermatid production and a significant increase in the frequency of macrospermatids are observed in centric fusion carriers. The DNA content of giant spermatids was mainly 2c, suggesting that there may be any meiotic misbehaviour during meiosis. However, 3c to 5c macrospermatids were also found; hence, other mechanism, such as cell fusion, may be involved in the production of abnormal sperm. Although this influence may affect any component of fitness in a negative way, it ought to be counterbalanced by any adaptive effect or else by meiotic drive in order to explain the maintenance of the centric fusion in natural populations.

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Effects of supernumerary heterochromatin on chiasma condition in two species of Acrididae (Orthoptera)

Cited by 12 publications

References 30 publications

Supernumerary heterochromatin, chiasma conditions and abnormal sperm formation inDichroplus elongatus(Orthoptera): intra and interpopulation analysis

Supernumerary heterochromatin, chiasma conditions and abnormal sperm formation inDichroplus elongatus(Orthoptera): intra and interpopulation analysis

B-chromosomes ofTrimerotropis pallidipennis(Oedipodinae, Acrididae): new effects on chiasma conditions

Effects of chromosome rearrangements on sperm formation inSinipta dalmani(Orthoptera: Acrididae)

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