Polyploidy as a chromosomal component of stochastic noise: variable scalar multiples of the diploid chromosome complement in the invertebrate species Girardia schubarti from Brazil
Abstract Chromosome stoichiometry, a form of genetic plasticity, specifically refers to variation in the standard diploid genomic composition of an individual or species. In the present work, freshwater planarians (Girardia schubarti) were analyzed to recognize variations in chromosomal stoichiometr...
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| Format: | Article |
| Language: | English |
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Instituto Internacional de Ecologia
2017-06-01
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| Series: | Brazilian Journal of Biology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842017000400745&lng=en&tlng=en |
| _version_ | 1818422189829914624 |
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| author | E. G. F. Benya A. M. Leal-Zanchet J. Hauser |
| author_facet | E. G. F. Benya A. M. Leal-Zanchet J. Hauser |
| author_sort | E. G. F. Benya |
| collection | DOAJ |
| description | Abstract Chromosome stoichiometry, a form of genetic plasticity, specifically refers to variation in the standard diploid genomic composition of an individual or species. In the present work, freshwater planarians (Girardia schubarti) were analyzed to recognize variations in chromosomal stoichiometry especially of complete ploidal change between specimens, within specimens and between cells within specimens and any relations they might have with selected components of phenotypic plasticity. Homoploid polyploids for the group reached rational scalar multiples (e.g. tetraploids) or irrational scalar multiples (e.g. triploids). Karyotypic mosaics emerged where individual cells presented polyploid multiples in arithmetic and geometric progressions. Ploidal multiplicity, a chromosomal component of stochastic noise, had positive phenotypic effects (increased dimensions) on morphologic criteria of body length, body width and dorsal surface reflecting a significant genotypic plasticity (GP) and robust phenotypic plasticity (PP). Variable but significant association of genotypic plasticity with robust phenotypic variance suggests kinetics of phenotypic homeostasis that is species-specific permitting phenotypic adaptability to environmental variables by means of GP. That association is diminished, deactivated or lost in more advanced and more complex organisms. |
| first_indexed | 2024-12-14T13:22:18Z |
| format | Article |
| id | doaj.art-1f40d110f6834e1596acb9938f65b7ee |
| institution | Directory Open Access Journal |
| issn | 1678-4375 |
| language | English |
| last_indexed | 2024-12-14T13:22:18Z |
| publishDate | 2017-06-01 |
| publisher | Instituto Internacional de Ecologia |
| record_format | Article |
| series | Brazilian Journal of Biology |
| spelling | doaj.art-1f40d110f6834e1596acb9938f65b7ee2022-12-21T22:59:54ZengInstituto Internacional de EcologiaBrazilian Journal of Biology1678-43752017-06-0177474575110.1590/1519-6984.20615S1519-69842017000400745Polyploidy as a chromosomal component of stochastic noise: variable scalar multiples of the diploid chromosome complement in the invertebrate species Girardia schubarti from BrazilE. G. F. BenyaA. M. Leal-ZanchetJ. HauserAbstract Chromosome stoichiometry, a form of genetic plasticity, specifically refers to variation in the standard diploid genomic composition of an individual or species. In the present work, freshwater planarians (Girardia schubarti) were analyzed to recognize variations in chromosomal stoichiometry especially of complete ploidal change between specimens, within specimens and between cells within specimens and any relations they might have with selected components of phenotypic plasticity. Homoploid polyploids for the group reached rational scalar multiples (e.g. tetraploids) or irrational scalar multiples (e.g. triploids). Karyotypic mosaics emerged where individual cells presented polyploid multiples in arithmetic and geometric progressions. Ploidal multiplicity, a chromosomal component of stochastic noise, had positive phenotypic effects (increased dimensions) on morphologic criteria of body length, body width and dorsal surface reflecting a significant genotypic plasticity (GP) and robust phenotypic plasticity (PP). Variable but significant association of genotypic plasticity with robust phenotypic variance suggests kinetics of phenotypic homeostasis that is species-specific permitting phenotypic adaptability to environmental variables by means of GP. That association is diminished, deactivated or lost in more advanced and more complex organisms.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842017000400745&lng=en&tlng=enhaploidesplasticidade genéticamosaicos cariotípicoshomeostase cinéticavalor ploidal |
| spellingShingle | E. G. F. Benya A. M. Leal-Zanchet J. Hauser Polyploidy as a chromosomal component of stochastic noise: variable scalar multiples of the diploid chromosome complement in the invertebrate species Girardia schubarti from Brazil Brazilian Journal of Biology haploides plasticidade genética mosaicos cariotípicos homeostase cinética valor ploidal |
| title | Polyploidy as a chromosomal component of stochastic noise: variable scalar multiples of the diploid chromosome complement in the invertebrate species Girardia schubarti from Brazil |
| title_full | Polyploidy as a chromosomal component of stochastic noise: variable scalar multiples of the diploid chromosome complement in the invertebrate species Girardia schubarti from Brazil |
| title_fullStr | Polyploidy as a chromosomal component of stochastic noise: variable scalar multiples of the diploid chromosome complement in the invertebrate species Girardia schubarti from Brazil |
| title_full_unstemmed | Polyploidy as a chromosomal component of stochastic noise: variable scalar multiples of the diploid chromosome complement in the invertebrate species Girardia schubarti from Brazil |
| title_short | Polyploidy as a chromosomal component of stochastic noise: variable scalar multiples of the diploid chromosome complement in the invertebrate species Girardia schubarti from Brazil |
| title_sort | polyploidy as a chromosomal component of stochastic noise variable scalar multiples of the diploid chromosome complement in the invertebrate species girardia schubarti from brazil |
| topic | haploides plasticidade genética mosaicos cariotípicos homeostase cinética valor ploidal |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842017000400745&lng=en&tlng=en |
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