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  • 1
    Digitale Medien
    Digitale Medien
    Cytogenetics of Cultivated Bougainvilleas. IX. Precocious Centromere Division and Origin of Polyploid Taxa (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 97 (1986), S. 0 
    Details
    ISSN: 1439-0523
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Precocious centromere division at metaphase I leading to diploid gamete formation has been observed in three cultivars. Some of the PMC's are characterized only by rod bivalents whose centromeres split at metaphase I. After passing to respective poles, the already divided centromeres fall apart at telophase I, with the result that each pole has unreduced number of 34 chromosomes. There is no second division and such cells form dyads which give rise to diploid pollen grains. Such unreduced pollen are 100 per cent fertile because of reduced (or no) recombination between hamoeolugous genomes and the presence of two sets of chromosomes. Thus, triploids or even tetraploids can arise when such pollen grains are involved in tertilization with reduced or unreduced egg of other cultivars.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1439-0523.1986.tb01057.x
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  • 2
    Digitale Medien
    Digitale Medien
    Phylogenetic relationships of Cajanus cajan (L.) Millsp. (pigeonpea) and its wild relatives based on seed protein profiles (1996)
    Springer
    Genetic resources and crop evolution 43 (1996), S. 275-281 
    Details
    ISSN: 1573-5109
    Schlagwort(e): Cajanus ; electrophoresis ; pigeonpea ; seed storage proteins ; species relationships
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Total seed storage protein of 9 accessions of cultivated C. cajan and 10 wild Cajanus species was reported and compared by sodium dodecyl sulphate polyacrylamide gel electrophoresis. A considerable variation was detected among the protein profiles of different accessions of C. cajan while those of wild species were very specific and distinctly different from each other. Relative similarities between various taxa were estimated by Jaccard's similarity index and cluster analysis was performed to produce a UPGMA dendrogram. The clustering of 10 wild species and C. cajan more or less agrees with their sectional classification and available data based on morphological characteristics, crossability, genome pairing in hybrids and nuclear RFLPs. The species closest to C. cajan is C. cajanifolia although the accessions of C. cajan also share some bands present in the profiles of C. scarabaeoides, C. goensis, C. lineatus, C. acutifolius and C. volubilis. This points towards polyphyletic origin of the cultigen which has been discussed in this paper.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00123279
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  • 3
    Digitale Medien
    Digitale Medien
    Seed protein electrophoresis of wild and cultivated species of Celosia (Amaranthaceae) (1997)
    Springer
    Genetic resources and crop evolution 44 (1997), S. 241-245 
    Details
    ISSN: 1573-5109
    Schlagwort(e): Celosia ; electrophoresis ; cockscomb ; seed storage proteins ; species relationships
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Total seed storage proteins of five species of Celosia (14 taxa) have been compared by sodium dodecyl sulphate polyacrylamide gel electrophoresis. Relative similarities between the taxa were estimated by Jaccard's similarity index and cluster analysis was performed to produce a UPGMA dendrogram which divides 14 taxa into two groups while C. trigyna holds an isolated position. One group includes 4x C. cristata and C. plumosa, wild 8x C. argentea and 12x C. whitei and the other separates four accessions of 4x C. argentea. This raises a doubt regarding 4x types of C. argentea being the direct progenitors of the cultivated types.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008670407477
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  • 4
    Digitale Medien
    Digitale Medien
    Genome size and polyploidy variation in the tropical hardwood genusTerminalia (Combretaceae) (1996)
    Springer
    Plant systematics and evolution 200 (1996), S. 225-232 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Combretaceae ; Terminalia ; Polyploidy ; genome size variation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Chromosome complements and 2C DNA amounts of six species ofTerminalia have been studied.Terminalia oliveri, T. myriocarpa andT. arjuna are diploid (2n = 24),T. chebula andT. bellirica are tetraploid (2n = 48),T. muelleri shows a triploid number (2n = 36). Two well demarcated groups of species are recognizable on the basis of chromosome length and 2C DNA values which range from 3.60 pg (T. oliveri) to 12.80 pg (T. bellirica) showing a 3.5-fold difference. Differences of DNA per basic genome or per chromosome are greatest (1.97-fold) betweenT. oliveri andT. arjuna. Two species groups (1)T. oliveri andT. chebula, and (2)T. myriocarpa, T. arjuna, T. muelleri, T. bellirica, therefore are well differentiated by DNA per basic genome, irrespective of polyploidy. The mean values of the two groups are 1.81 pg and 3.34 pg, respectively, showing a 1.84-fold difference. Within diploids and tetraploids there is 1.97-fold and 1.76-fold variation, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00984937
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  • 5
    Digitale Medien
    Digitale Medien
    Nuclear DNA content inCelosia (Amaranthaceae) (1992)
    Springer
    Plant systematics and evolution 182 (1992), S. 253-257 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Amaranthaceae ; Celosia ; DNA content ; polyploidy ; genome evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Nuclear DNA amount of five species ofCelosia ranging from 2x to 12x varies from 3.26 (2x) to 9.70pg (12x). The diploidC. trigyna has twice as much DNA/basic genome as other taxa, which is commensurate with its taxonomic position and genetic isolation. There is insignificant variation in DNA/basic genome among 4x, 8x, and 12x taxa. Therefore, DNA/nucleus shows a strong positive correlation with ploidy level. The different accessions of 4x taxa show constancy of DNA amounts. There is no correlation of seed weight with DNA amount.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00939191
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  • 6
    Digitale Medien
    Digitale Medien
    Genome size in gymnosperms (1986)
    Springer
    Plant systematics and evolution 153 (1986), S. 119-132 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Gymnosperms ; Nuclear DNA content ; evolution ; polyploidy ; woody habit
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The DNA 2C and per chromosome values of 57 species belonging to 22 genera of gymnosperms have been analysed. The overall range is 12-fold with a modal value of about 30.0 pg.Cycadales exhibit a 2-fold difference. AmongConiferales with a 4-fold variation, thePinaceae have higher mean DNA contents as well as a greater range and diversity than other families. Remarkable interspecific differences are found inCycas, Picea, Larix, Pinus, Callitris, Cupressus, andChamaecyparis. Despite this, there is a constancy of basikaryotypes within these genera.Gnetum shows a distinctly low DNA value.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00989421
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  • 7
    Digitale Medien
    Digitale Medien
    Correlations between 2C DNA values and habit inCassia (Leguminosae:Caesalpinioideae) (1986)
    Springer
    Plant systematics and evolution 153 (1986), S. 223-227 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Leguminosae ; Caesalpinioideae ; Cassia ; Habit ; DNA content ; evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Ten species of the genusCassia show a range of 2C DNA amounts from 1.30 to 2.54 pg at the same ploidy level. Remarkably, a distinct 2-fold increase is depicted by an arboreal speciesC. excelsa while the rest comprising of herbs, trees and shrubs have a range from 1.30 to 1.47 pg. These form a natural grouping with respect to mean DNA amounts which differ by 0.05 pg in the herbs, trees and shrubs respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00983689
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  • 8
    Digitale Medien
    Digitale Medien
    Nuclear DNA contents in the genusFicus (Moraceae) (1987)
    Springer
    Plant systematics and evolution 156 (1987), S. 1-4 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Moraceae ; Ficus ; Nuclear DNA contents ; speciation ; woody habit
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Nuclear DNA contents in 15 species of large tropical hardwood genusFicus have been determined by cytophotometry. The 2 C-values are rather low and uniform, suggesting no appreciable changes during speciation. The small genome size is discussed in relation to woody habit.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00937196
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  • 9
    Digitale Medien
    Digitale Medien
    Evolution of genome size inAllium (Alliaceae) (1998)
    Springer
    Plant systematics and evolution 210 (1998), S. 57-86 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Alliaceae ; Allium ; Nuclear DNA amount ; adaptation ; evolution ; infrageneric classification
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The 4C DNA amounts of 86 species fromAllium subgg.Allium, Rhizirideum, Bromatorrhiza, Melanocrommyum, Caloscordum andAmerallium show a 8.35-fold difference ranging from 35.60 pg (A. ledebourianum, 2n = 16) to 297.13 pg (A. validum 2n = 56). At diploid level the difference is 3.57-fold betweenA. ledebourianum (35.60 pg) andA. ursinum (127.14 pg). This shows that a significant loss and/or gain of DNA has occurred during evolution. On average subgg.Rhizirideum andAllium have less DNA amount than subgg.Melanocrommyum andAmerallium. The distribution of nuclear DNA amounts does not show discontinuous pattern and regular groups. The evolution of genome size has been discussed in relation to polyploidy and genomes, heterochromatin, adaptive changes in morphological characteristics, phenology and ecological factors, and infrageneric classification.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00984728
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  • 10
    Digitale Medien
    Digitale Medien
    Variability in nuclear DNA content within pigeonpea,Cajanus cajan (Fabaceae) (1994)
    Springer
    Plant systematics and evolution 189 (1994), S. 211-216 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Fabaceae ; Cajanus cajan ; Nuclear DNA amount variation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract 4C DNA values have been estimated in 16 cultivars ofCajanus cajan by cytophotometry. The values range between 6.19 pg to 7.97 pg, a 23.6% variation. The cultivars form four groups which differ significantly from each other but have insignificant difference within them. The implications of this variability with respect to the heterogeneity and origin of this legume crop are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00939727
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