Genome size for the species of Nerine Herb. (Amaryllidaceae) and its evident correlation with growth cycle, leaf width and other morphological characters

Zonneveld, B. J. M.; Duncan, Graham

doi:10.1007/s00606-005-0381-x

Cited by 27 publications

(19 citation statements)

References 15 publications

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“…Despite the ubiquitous activity of retrotransposons and the presence of cytogenetic and chromosomal interactions, variation in genome size among species is mostly discontinuous to the extent that it often enables the discrimination of closely related taxa, genera and families (Bureš et al. , 2004; Bennett & Leitch, 2005; Zonneveld & Duncan, 2006; Eilam et al. , 2007; Šmarda et al.…”

Section: Introductionmentioning

confidence: 99%

“…nonreciprocal chromosomal recombination, large-scale genome duplications, specific sequence elimination, aneuploidy and the presence of B chromosomes; Gupta & Rees, 1975;Hutchinson et al, 1979;Feldman et al, 1997;Poggio et al, 1998;Ku et al, 2000;Ozkan et al, 2001Ozkan et al, , 2003Eilam et al, 2008). Despite the ubiquitous activity of retrotransposons and the presence of cytogenetic and chromosomal interactions, variation in genome size among species is mostly discontinuous to the extent that it often enables the discrimination of closely related taxa, genera and families (Bureš et al, 2004;Bennett & Leitch, 2005;Zonneveld & Duncan, 2006;Eilam et al, 2007;Šmarda et al, 2008a;Chrtek et al, 2009;Leitch et al, 2009). The distinct genome sizes of related species suggest that most of the variations in genome size that are generated through individuals' life histories may be eliminated by stabilizing selection.…”

Section: Introductionmentioning

confidence: 99%

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Stabilizing selection on genome size in a population of Festuca pallens under conditions of intensive intraspecific competition

et al. 2010

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Summary• Stabilizing selection is a key evolutionary mechanism for which there is relatively little experimental evidence. To date, stabilizing selection has never been observed at the whole-genome level.• We tested the effect of selection on genome size in a field experiment using seeds collected in a population of Festuca pallens with a highly variable genome size. Using flow cytometry, we measured the genome size in germinating seedlings and juvenile plants grown with or without high intraspecific competition (908 individuals). Above-ground biomass and leaf number were used as measurements of individual vegetative performance. The possible confounding effect of seed weight was controlled for in a separate experiment.• Growth under high competition had a significant stabilizing effect on genome size. Because no relationship was observed between genome size and vegetative performance, we assume that the elimination of plants with extreme genome sizes was the result of decreased survival as a consequence of some unrecognized stress.• Our results indicate that genome size may be under direct selection. The equal disadvantaging of either large or small genomes indicates that the selection for optimum genome size in species may be fully context dependent. This study demonstrates the power of competition experiments for the detection of weak selection processes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stabilizing selection on genome size in a population of Festuca pallens under conditions of intensive intraspecific competition

et al. 2010

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“…(Zonneveld & Van Iren, 2001), Galanthus L. (Zonneveld & al., 2003a), Agapanthus L'Hér. (Zonneveld & Duncan, 2003b), Nerine Herb (Zonneveld & Duncan, 2006), Narcissus L. (Zonneveld, 2008) and Tulipa L. has shown that nuclear DNA content of species and cultivars can contribute to the taxonomy of species and the origin of hybrids. The N. pseudonarcissus L. complex has given rise in nature to many forms now accommodated in eight subspecies (Zonneveld, 2008 The taxonomy of all species of Narcissus (Amaryllidaceae) has been investigated recently by flow cytometry (Zonneveld, 2008).…”

Section: Introductionmentioning

confidence: 99%

The involvement of <i>Narcissus hispanicus</i> Gouan in the origin of <i>Narcissus bujei</i> and of cultivated trumpet daffodils (Amaryllidaceae)

Zonneveld¹

2010

Anal. Jard. Bot. Madr.

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Zonneveld, B.J.M. 2010. The involvement of Narcissus hispanicus Gouan in the origin of Narcissus bujei and of cultivated trumpet daffodils (Amaryllidaceae). Anales Jard. Bot. Madrid 67(1): 29-39.To investigate the origin of cultivated trumpet daffodils the genome size (2C-value) of more than 100 old and new cultivars were measured. A large number of concolored yellow tetraploid cultivars with large coronas seem to be derived from a doubling of chromosomes of a hybrid of the two species N. hispanicus Gouan and N. pseudonarcissus L. This can also still be recognized by the presence of a black spot at the top of the anthers in about 15 % of the tetraploid cultivars. Assuming N. pseudonarcissus as one of the parents of the allotetraploid cultivars, species of trumpet daffodils of section Pseudonarcissi investigated earlier were compared. Doubling of the nuclear DNA content of 23. Para investigar el origen de los narcisos trompeta cultivados se midió el tamaño del genoma (valor 2C) de más de 100 cultivares viejos y nuevos. Un gran número de cultivares tetraploides amarillos de color uniforme y con grandes coronas parecían derivarse de una duplicación de cromosomas de un híbrido de las dos especies N. hispanicus Gouan y N. pseudonarcissus L. Esto también se observa por la presencia de una mancha negra en la parte superior de las anteras en alrededor del 15 % de los cultivares tetraploides. Tomando a N. pseudonarcissus por uno de los parentales de los cultivares alotetraploides, se compararon especies de narcisos trompeta de la sección Pseudonarcissi que ya hubiesen sido investigados anteriormente. La duplicación del contenido de ADN nuclear de 23,8 pg de N. pseudonarcissus queda por debajo de los valores hallados en los narcisos trompeta. Se evaluaron otras especies de narciso trompeta de la sección Pseudonarcissi con una cantidad más alta de ADN nuclear complementaria, tales como N. hispanicus, con 25.8 pg, N. poeticus L., con 26 pg y el hexaploide N. pseudonarcissus ssp. bicolor (L.) Baker, con 67.7 pg (Zonneveld, 2008), entre otras. N. hispanicus, con 25.8 pg, se diferencia claramente de N. pseudonarcissus, con 23.8 pg, y también se acepta aquí como especie. El contenido de ADN nuclear de N. bujei (Fern. Casas) Fern. Casas, con 30 pg, se adecua al hibridismo (antiguo) para N. bujei entre N. longispathus Pugsley (36 pg) y N. hispanicus Gouan (25,8 pg). Los tetraploides con tépalos blancos y coronas amarillas pueden obtenerse con el cruzamiento entre N. pseudonarcissus diploide y el hexaploide y bicolor N. pseudonarcissus ssp. bicolor (L.) Baker.Palabras clave: Narcissus hispanicus, origen de los narcisos trompeta, origen de N. bujei.

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“…Where many species in a genus have the same chromosome numbers, differences in nuclear DNA content are often present and have proven to be very effective in delimiting infrageneric divisions in a number of taxa (Ohri 1998). Genome size has been demonstrated to often vary a factor 1.5-3 between taxa with identical chromosome numbers (Ohri 1998;Yokoya et al 2000;Zonneveld 2001;Zonneveld and van Iren 2001;Ellul et al 2002;Zonneveld et al 2003a, b;Hirsch et al 2004: Albach andGreilhuber 2004;Zonneveld and Duncan 2006). Moreover, Greilhuber (1998Greilhuber ( , 2005 has clearly shown that intraspecific variation of genome size is much less than assumed.…”

Section: Introductionmentioning

confidence: 99%

The systematic value of nuclear DNA content for all species of Narcissus L. (Amaryllidaceae)

Zonneveld

2008

Plant Syst Evol

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The taxonomy of all species of Narcissus (Amaryllidaceae), an important horticultural crop, has not been investigated recently. As a new approach, genome size was determined by flow cytometry with propidium iodide from 375 accessions. The somatic nuclear DNA contents (2C) were shown to range from 14 to 38 pg for the diploids. Narcissus assoanus and N. gaditanus are, based on their nuclear DNA content, removed from section Apodanthi and placed in a new section Juncifolii. The different ploidy levels and species involved were entangled for N. ''fernandesii'' s.l. and a new allotetraploid form is named here. Section Pseudonarcissus was much more heterogeneous in nuclear DNA content than expected. Sixty-five accessions of N. pseudonarcissus possessed, with 23.7 pg, similar amounts of DNA. However, several species from this section were clearly distinctive in nuclear DNA content. It runs from the diploid N. primigenius with 21.7 pg to the also diploid N. nevadensis with 38.2 pg. Also N. abscissus and N. moleroi are with about 26 pg clearly different from N. pseudonarcissus. For the first time, in 11 accessions, hexaploidy was found in N. pseudonarcissus ssp. bicolor. A new section Nevadensis with 30-39 pg of nuclear DNA was split off from the section Pseudonarcissus with now 21-27 pg. A nonoploid N. dubius with 96.3 pg has by far the highest amount of nuclear DNA and can be calculated to have the highest ploidy ever reported in Narcisssus. The total number of Narcissus species was determined as 36, nine more than in Flora Europaea and they were divided up in two subgenera and 11 sections. Flow cytometry is shown to produce easily obtainable and original systematic data that lead to new insights. Genome size or C-value turns out to be one of the most salient features to define the status of the species in the genus Narcissus.

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Genome size for the species of Nerine Herb. (Amaryllidaceae) and its evident correlation with growth cycle, leaf width and other morphological characters

Cited by 27 publications

References 15 publications

Stabilizing selection on genome size in a population of Festuca pallens under conditions of intensive intraspecific competition

Stabilizing selection on genome size in a population of Festuca pallens under conditions of intensive intraspecific competition

The involvement of <i>Narcissus hispanicus</i> Gouan in the origin of <i>Narcissus bujei</i> and of cultivated trumpet daffodils (Amaryllidaceae)

The systematic value of nuclear DNA content for all species of Narcissus L. (Amaryllidaceae)

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