Nuclear DNA amount during sporogenesis and gametogenesis in sexual and aposporous buffelgrass

1995 ◽  
Vol 8 (2) ◽  
Author(s):  
R.T. Sherwood
Keyword(s):  
Nuclear Dna ◽  
Dna Amount ◽  
Nuclear Dna Amount

scholarly journals Biosystematics of the Malagasy Frogs. II. The Genus Boophis (Rhacophoridae)

1979 ◽  
Vol 49 (2) ◽  
pp. 261-p4 ◽  
Author(s):  
R.M.A. Blommers-Schlösser
Keyword(s):  
Nuclear Dna ◽  
Dna Amount ◽  
Adult Morphology ◽  
Nuclear Dna Amount ◽  
Mating Calls

This paper concerns the genus Boophis Tschudi, 1938 ( = Malagasy Rhacophorus Kuhl & Van Hasselt, 1822). Apart from a reconsidering of adult morphology, certain new taxonomic characters, such as the colouration in life, the morphology of the tadpole and some mating calls, are presented. Karyotypes and nuclear DNA amount were reported upon elsewhere.

Nuclear DNA amount, growth, and yield parameters in maize

1994 ◽  
Vol 88 (5) ◽  
pp. 557-560 ◽  
Author(s):  
D. P. Biradar ◽  
D. G. Bullock ◽  
A. Lane Rayburn
Keyword(s):  
Nuclear Dna ◽  
Growth And Yield ◽  
Dna Amount ◽  
Yield Parameters ◽  
Nuclear Dna Amount

Variation in nuclear DNA amount between wild and cultivated populations of Milium effusum (2n = 28)

Genome ◽  
1992 ◽  
Vol 35 (6) ◽  
pp. 1050-1053 ◽  
Author(s):  
Simon T. Bennett ◽  
Michael D. Bennett
Keyword(s):  
Intraspecific Variation ◽  
Nuclear Dna ◽  
Environmental Changes ◽  
Natural Habitat ◽  
Practical Importance ◽  
Plant Conservation ◽  
Plant Responses ◽  
Dna Amount ◽  
Nuclear Dna Amount ◽  
Dna Amounts

Mean 2C DNA amounts varied by 35.6%, ranging from 7.52 to 10.20 pg, between 10 populations of the grass Milium effusum L. Such intraspecific variation occurred despite a constant chromosome number (2n = 28) and no obvious differences in karyotype. Plants originating from botanic garden populations growing in cultivation had significantly (P < 0.001) larger DNA amounts than plants collected from wild populations. Moreover, variation in DNA amount within either the "cultivated" or the "wild" groups was not significant. As the environment in which plants are kept in botanic gardens is clearly different to the natural habitat for M. effusum, it seems likely that the difference in nuclear DNA amount is causally related, perhaps through its nucleotypic effects, to microclimate adaptation. These results suggest that at least some genotypes of M. effusum are fluid and sensitive to environmental change. Such data may have broad practical importance regarding plant responses to various environmental changes such as a nuclear winter and global warming, and implications for plant conservation and reintroduction. Milium effusum is a potentially useful plant material for studying the nature of intraspecific variation in DNA amount.Key words: Milium effusum, nuclear DNA amounts, nucleotype, environmental adaptation.

Cytology ofViciaspecies. IX. Nuclear DNA amount, chromatin organization and computer aided karyotyping of a Russian accession ofVicia faba.L

Caryologia ◽  
2000 ◽  
Vol 53 (3-4) ◽  
pp. 195-204 ◽  
Author(s):  
V.V Kotseruba ◽  
G. Venora ◽  
S. Blangiforti ◽  
M. Ruffini castiglione ◽  
R. cremonini
Keyword(s):  
Nuclear Dna ◽  
Chromatin Organization ◽  
Dna Amount ◽  
Nuclear Dna Amount ◽  
Computer Aided

scholarly journals Nuclear DNA Amount Variation in Cyamopsis D.C. (Fabaceae)

CYTOLOGIA ◽  
2004 ◽  
Vol 69 (1) ◽  
pp. 59-62 ◽  
Author(s):  
Chandrashekhar G. Patil
Keyword(s):  
Nuclear Dna ◽  
Dna Amount ◽  
Nuclear Dna Amount

Genome size and genome evolution in diploid Triticeae species

Genome ◽  
2007 ◽  
Vol 50 (11) ◽  
pp. 1029-1037 ◽  
Author(s):  
T. Eilam ◽  
Y. Anikster ◽  
E. Millet ◽  
J. Manisterski ◽  
O. Sagi-Assif ◽  
...  
Keyword(s):  
Genome Size ◽  
Intraspecific Variation ◽  
Dna Content ◽  
Nuclear Dna ◽  
Diploid Species ◽  
Nuclear Dna Content ◽  
Dna Amount ◽  
Nuclear Dna Amount ◽  
Speciation Event ◽  
Close Temporal Proximity

One of the intriguing issues concerning the dynamics of plant genomes is the occurrence of intraspecific variation in nuclear DNA amount. The aim of this work was to assess the ranges of intraspecific, interspecific, and intergeneric variation in nuclear DNA content of diploid species of the tribe Triticeae (Poaceae) and to examine the relation between life form or habitat and genome size. Altogether, 438 plants representing 272 lines that belong to 22 species were analyzed. Nuclear DNA content was estimated by flow cytometry. Very small intraspecific variation in DNA amount was found between lines of Triticeae diploid species collected from different habitats or between different morphs. In contrast to the constancy in nuclear DNA amount at the intraspecific level, there are significant differences in genome size between the various diploid species. Within the genus Aegilops , the 1C DNA amount ranged from 4.84 pg in A. caudata to 7.52 pg in A. sharonensis; among genera, the 1C DNA amount ranged from 4.18 pg in Heteranthelium piliferum to 9.45 pg in Secale montanum . No evidence was found for a smaller genome size in annual, self-pollinating species relative to perennial, cross-pollinating ones. Diploids that grow in the southern part of the group’s distribution have larger genomes than those growing in other parts of the distribution. The contrast between the low variation at the intraspecific level and the high variation at the interspecific one suggests that changes in genome size originated in close temporal proximity to the speciation event, i.e., before, during, or immediately after it. The possible effects of sudden changes in genome size on speciation processes are discussed.

Nuclear DNA variation among acridid grasshoppers

1978 ◽  
Vol 202 (1149) ◽  
pp. 517-525 ◽  
Keyword(s):  
Genetic Divergence ◽  
Large Scale ◽  
Nuclear Dna ◽  
Dna Amount ◽  
Dna Variation ◽  
Nuclear Dna Amount ◽  
Nuclear Dna Variation ◽  
Chromosome Material ◽  
Scale Variation

The nuclear DNA amount varies threefold among species of acridid grass­ hoppers. DNA amount is correlated with the total chromosome volume, as measured at metaphase of mitosis. Despite the large-scale variation in DNA amount and in the total volume of chromosome material there is a striking uniformity in respect of the relative sizes of chromosomes within complements. Males from the northern race of Cryptobothrus chrysophorus contain about 20% more nuclear DNA than males from the southern race. The DNA difference may be explained by supernumerary segments within chromosomes in the northern populations. The magnitude of the DNA variation between these races is indicative of substantial genetic divergence. It may well be that the two races merit separate specific ranking.

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