2009
Genome size inheritance in intraspecific crosses within diploid and within tetraploid plants of Festuca pallens varying in genome size
ŠMARDA, Petr, Lucie HOROVÁ a Petr BUREŠZákladní údaje
Originální název
Genome size inheritance in intraspecific crosses within diploid and within tetraploid plants of Festuca pallens varying in genome size
Název česky
Dědičnost belikosti genomu při vnitrodruhovém křížení diploidních a tetraploidních rostlin Festuca pallens s různě velkým genomem
Autoři
Vydání
Saint Malo, International conference on polyploidy, hybridization and biodiversity. Program and abstracts. s. 153-153, 2009
Nakladatel
Imprimerie de l Université de Rennes
Další údaje
Jazyk
angličtina
Typ výsledku
Stať ve sborníku
Obor
10600 1.6 Biological sciences
Stát vydavatele
Francie
Utajení
není předmětem státního či obchodního tajemství
Organizační jednotka
Přírodovědecká fakulta
Klíčová slova anglicky
grasses; genome size evolution; adaptivity; polyploidy
Štítky
Příznaky
Mezinárodní význam
Změněno: 13. 4. 2012 09:10, Iva Klímová
V originále
Intraspecific variation in genome size is one of important phenomena making possible to study early phases of genome evolution in species. Compared to genomic methods, measurement of genome size by flow cytometry is fast and cheap, and may cover hundreds of plants, as needed in any study of micro-evolutionary processes in natural populations. By the study of these processes, a special attention is paid to the heritability of a newly appearing character which determinates its survival and establishment in a population or further in a separate species. We tested the inheritance of genome size by reciprocal crosses between diploid (10 pairs) and between tetraploid (10 pairs) plants of Festuca pallens (Poaceae) differing in genome size (not caused by the presence of B-chromosomes). We have shown that differences in genome size within species do not constitute a reproduction barrier. The progeny of some maternal plants was shown to significantly vary in genome size (up to 1.081-fold, and even if the parental genome sizes were similar), which indicates that some variation in genome size is probably produced during the gametogenesis. In reciprocal crosses of diploid plants, the genome size found in progenies ranged between the sizes of parents, and only occasionally a weak maternal effect was detected. In the progenies from crosses between tetraploid plants, significantly higher variation in genome size was observed, regularly exceeding the range of parental genome sizes. Our data indicate a very weak inheritance and easy induction of genome size variation in Festuca pallens, which implies that the establishment of a population (or possibly also of a new species) with different genome size may be a result of a random event (e.g., bottleneck or founder effect) rather than a result of an adaptive process. In this respect, a stronger adaptivity effect may be assumed in diploids.
Česky
Intraspecific variation in genome size is one of important phenomena making possible to study early phases of genome evolution in species. Compared to genomic methods, measurement of genome size by flow cytometry is fast and cheap, and may cover hundreds of plants, as needed in any study of micro-evolutionary processes in natural populations. By the study of these processes, a special attention is paid to the heritability of a newly appearing character which determinates its survival and establishment in a population or further in a separate species. We tested the inheritance of genome size by reciprocal crosses between diploid (10 pairs) and between tetraploid (10 pairs) plants of Festuca pallens (Poaceae) differing in genome size (not caused by the presence of B-chromosomes). We have shown that differences in genome size within species do not constitute a reproduction barrier. The progeny of some maternal plants was shown to significantly vary in genome size (up to 1.081-fold, and even if the parental genome sizes were similar), which indicates that some variation in genome size is probably produced during the gametogenesis. In reciprocal crosses of diploid plants, the genome size found in progenies ranged between the sizes of parents, and only occasionally a weak maternal effect was detected. In the progenies from crosses between tetraploid plants, significantly higher variation in genome size was observed, regularly exceeding the range of parental genome sizes. Our data indicate a very weak inheritance and easy induction of genome size variation in Festuca pallens, which implies that the establishment of a population (or possibly also of a new species) with different genome size may be a result of a random event (e.g., bottleneck or founder effect) rather than a result of an adaptive process. In this respect, a stronger adaptivity effect may be assumed in diploids.
Návaznosti
| GA206/03/0228, projekt VaV |
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| LC06073, projekt VaV |
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| MSM0021622416, záměr |
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