Interaction among different heterocromatic variants in the grasshopper Dichroplus elongatus.

  title={Interaction among different heterocromatic variants in the grasshopper Dichroplus elongatus.},
  author={M. Isabel Remis and Sara Pensel and Natalia Rosetti},
  volume={141 2},
Simultaneous chromosome polymorphisms for supernumerary elements allow us to analyse the relationships among different forms of heterochromatic variation in nature. We report simultaneous variation patterns for supernumerary segments in chromosomes S10 (SS10), S9 (SS9) and S6 (SS6) and B chromosomes in nine populations of the grasshopper Dichroplus elongatus from two biogeographic provinces from east Argentina. Our results show spatial chromosome differentiation for three out of four… Expand
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Supernumerary Chromosome Variants in Dichroplus elongatus (Acrididae): Fluorescent Banding and Cline Variation Pattern
Dichroplus elongatus is a South American grasshopper that shows simultaneous polymorphisms for B chromosomes and several supernumerary segments located in chromosome pairs S10, S9, and M6, in natural populations from Argentina, and the pattern of chromosome variation is discussed in relation to the population's ability to maintain supern numerical DNA in more climatically favorable geographic regions. Expand


Non Random Distribution Patterns of Supernumerary Segments and B Chromosomes in Dichroplus Elongates (Orthoptera)
The patterns of chromosome variation do not agree with the geographical distribution of the populations, and the covariation of the heterochromatic forms may act as another factor that establish limits to stochastic factors, and could be involved in the non random pattern detected in D. elongarus. Expand
Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera):
B individuals present an increase of abnormal spermatid frequency which may be explained by the simultaneous occurrence of two mechanisms: 1) lagging of supernumeraries and 2) physiological effects of B's affecting the meiosis even in cells lacking them. Expand
Fitness effect analysis of a heterochromatic supernumerary segment in the grasshopper Eyprepocnemis plorans
The SCS polymorphism seems to be at a status close to neutrality in respect to fitness, but its slight disadvantage in transmission through females carrying B chromosomes predicts that the polymorphism should tend to disappear, unless SCS recurrent amplification, or another undiscovered force, counteracts this tendency. Expand
Mitochondrial DNA Variation in the South American Grasshopper Dichroplus elongatus (Orthoptera: Acrididae)
There was a significant heterogeneity of the mtDNA distribution when populations from all three biogeographic provinces were compared, and the distribution patterns of mtDNA variation observed in D. elongatus may be explained by isolation by distance when referring to the main biogeographical provinces. Expand
The supernumerary segment systems of Rumex acetosa
It is argued that meiotic drive plays a role in the maintenance of the ubiquitous SS1 low-frequency polymorphism but not the SS6 polymorphism which shows clear environmental correlations. Expand
Geographical patterns of karyotype polymorphism in Italian populations of Ornithogalum montanum (Liliaceae)
The geographical patterns of quinacrine banding polymorphism at 20 sites, and of numbers of accessory (B) chromosomes, were studied in nine Italian populations of Ornithogalum montanum Cyr. ex Ten.Expand
Supernumerary heterochromatin, chiasma conditions and abnormal sperm formation in Dichroplus elongatus (Orthoptera): intra and interpopulation analysis
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 cytokinesi... Expand
Geographical distribution of B chromosomes in the grasshopper Eyprepocnemis plorans, along a river basin, is mainly shaped by non-selective historical events
The analysis of 19 populations of the grasshoppers Eyprepocnemis plorans, collected along four rivers belonging to the Segura basin, has shown that the presence of B chromosomes ends abruptly in each river, coinciding with the existence of a narrow pass in which this grasshopper cannot live because of the absence of the appropriate habitats. Expand
Male and female segregation distortion for heterochromatic supernumerary segments on the S8 chromosome of the grasshopper Chorthippus jacobsi
The mode of inheritance of supernumerary segments located on three different chromosome pairs was investigated in controlled crosses with specimens of the grasshopper Chorthippus jacobsi and showed Mendelian inheritance, which accumulated through non-Mendelian transmission through both sexes. Expand
Inheritance and fitness effects of a pericentric inversion and a supernumerary chromosome segment in Muscari comosum (Liliaceae)
The inheritance and the effects on fitness of a pericentric inversion and a supernumerary chromosome segment (SCS) involving the second chromosome pair of Muscari comosum, have been analysed in anExpand