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231223s2005 xx ||||| 00| ||eng c |
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Clarkson, James J
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Long-term genome diploidization in allopolyploid Nicotiana section Repandae (Solanaceae)
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| 264 |
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1 |
|c 2005
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| 336 |
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 01.12.2005
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|a Date Revised 13.12.2023
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|a published: Print
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|a Citation Status MEDLINE
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|a Here, we analyze long-term evolution in Nicotiana allopolyploid section Repandae (the closest living diploids are N. sylvestris, the maternal parent, and N. obtusifolia, the paternal parent). We compare data with other more recently formed Nicotiana allopolyploids. We investigated 35S and 5S nuclear ribosomal DNA (rDNA) chromosomal location and unit divergence. A molecular clock was applied to the Nicotiana phylogenetic tree to determine allopolyploid ages. N. tabacum and species of Repandae were c. 0.2 and 4.5 Myr old, respectively. In all Repandae species, the numbers of both 35S and 5S rDNA loci were less than the sum of those of the diploid progenitors. Trees based on 5S rDNA spacer sequences indicated units of only the paternal parent. In recent Nicotiana allopolyploids, the numbers of rDNA loci equal the sum of those of their progenitors. In the Repandae genomes, diploidization is associated with locus loss. Sequence analysis indicates that 35S and 5S units most closely resemble maternal and paternal progenitors, respectively. In Nicotiana, 4.5 Myr of allopolyploid evolution renders genomic in situ hybridization (GISH) unsuitable for the complete resolution of parental genomes
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|a Journal Article
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| 650 |
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|a Research Support, Non-U.S. Gov't
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| 650 |
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7 |
|a DNA, Plant
|2 NLM
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| 650 |
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|a DNA, Ribosomal
|2 NLM
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| 700 |
1 |
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|a Lim, K Yoong
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kovarik, Ales
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Chase, Mark W
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Knapp, Sandra
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Leitch, Andrew R
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 168(2005), 1 vom: 21. Okt., Seite 241-52
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnns
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| 773 |
1 |
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|g volume:168
|g year:2005
|g number:1
|g day:21
|g month:10
|g pages:241-52
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|a AR
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|d 168
|j 2005
|e 1
|b 21
|c 10
|h 241-52
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