Cytotaxonomic Investigation of the Genus<i>Nigella</i>(Helleboreae) with C-Banding Techniques

Gilot-Delhalle, J.; Degraeve, N.; Moutschen, J.

doi:10.1080/00087114.1976.10796656

Cited by 16 publications

(13 citation statements)

References 26 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have also used differential staining techniques to demonstrate chromosome banding patterns as these have been successfully applied to the detection of karyotypic differences in several genera of Ranunculaceae (Marks & Schweizer 1974;Gilot-Delhalle et al 1976;Marks 1976). …”

Section: Introductionmentioning

confidence: 99%

Chromosome relationships and breeding barriers in New Zealand species ofRanunculus

Rendle

Murray

1989

New Zealand Journal of Botany

View full text Add to dashboard Cite

Chromosome numbers are reported for 24 species and five undescribed taxa of Ranunculus from New Zealand. Fourteen of these are new reports. The presence of diploid, tetraploid, hexaploid, and dodecaploid species was confirmed and a new 18-ploid race found. Some karyotype variation was found amongst the tetraploids and hexaploids and several species were karyotypically unique. At both these ploidy levels there was little evidence that the polyploids contained multiple sets of the same diploid genome. When this is taken with the observed variation in C-banding pattem and exclusive bivalent formation at meiotic metaphase it would appear that chromosome evolution has been via allopolyploidy. In section Ranunculus it was not possible to make hybrids between species of different ploidy levels but in section Epirotesploidy differences were not a barrier to hybridisation. The interspecific hybrids, with the exception of those above the hexaploid level, all had pollen fertilities of less than 30%. The cytological evidence and sterility barriers suggest that several of the undescribed taxa are good biological species.

show abstract

Section: Introductionmentioning

confidence: 99%

Chromosome relationships and breeding barriers in New Zealand species ofRanunculus

Rendle

Murray

1989

New Zealand Journal of Botany

View full text Add to dashboard Cite

show abstract

“…It is clear that both PCoA and UPGMA results support sectional or higher level for the group of species with winged seeds in Nigella. Based on cytological data, Gilot-Delhalle et al (1976) justified a sectional treatment of this same group.…”

Section: Discussionmentioning

confidence: 92%

“…However, the presence of capitate cells is a unique character of seeds from the genus Komaroffia. Furthermore, evidence from chromosome number (Strid 1970), morphology (Gilot-Delhalle et al 1976), leaf (Tamura 1995), petal (Zohary 1983) and pollen structure (Skvarla and Nowicke 1979) are quite enough to separate Komaroffia at the generic level. It thus seems that seed characters are more informative for taxonomic distinctions at the sectional level, while their taxonomic usefulness decreases at lower ranks.…”

Section: Discussionmentioning

confidence: 99%

Numerical analyses of seed morphology and its taxonomic significance in the tribe Nigelleae (Ranunculaceae)

Aydın

Dönmez

2019

Nordic Journal of Botany

View full text Add to dashboard Cite

We examined the seed morphology of Nigella, Garidella and Komaroffia to aid systematics and taxonomy. The seeds of 21 taxa in 20 species from Mediterranean and West Asian countries were studied using both zoom stereo and scanning electron microscopy (SEM). Principal coordinate analysis (PCoA) and unweighted average linkage analysis (UPGMA) were performed to assess the contribution of seed characters to the taxonomy of the tribe. Representative pictures from zoom stereo microscopy and SEM studies and measurement of seeds are presented. Most studied species showed unique seed surface sculpturing features, and seed shape, size and surface sculpturing separated the studied taxa into five main groups. However, the variation in seed shape and color were found to be in conflict with the generic taxonomy while macromorphological characters were found more congruent with the sectional taxonomy than with the generic taxonomy. Five main types of seed ornamentations – rugulose + striate, granulate, smooth, rugulose and mucronulate – were identified. Patterns in seed micromorphology strongly supported the sectional level taxonomy of Nigella. Two of the three sections of the genus were found to be well differentiated in terms of seed characters. Furthermore, seed morphology alone provide good support to Garidella as a distinct genus, but shows less taxonomic value for Komaroffia.

show abstract

“…It is then highly desirable to have a technique which offers the advantages of both semiempirical (fast computation) and ab-initio (higher reliability) schemes. Such methods have already been proposed and they are based on the use of the simulated abinitio molecular ( S A M O ) technique [ 5 , 6 ] or on linear combination of localized orbitals (LCLO) [7]. It is the purpose of this work to discuss an intermediate approach, the use of localized floating spherical Gaussian orbitals (FSGO) as originally proposed by Frost Such a procedure provides a relatively simple and computationally fast scheme of calculation that reproduces correctly the general trends in the electronic and geometrical structure of polymers.…”

Section: Introductionmentioning

confidence: 99%

A floating spherical gaussian orbital model for polymers: I. general formalism and computational procedure

André

Delhalle

Demanet

et al. 2009

Int. J. Quantum Chem.

View full text Add to dashboard Cite

show abstract

Cytotaxonomic Investigation of the GenusNigella(Helleboreae) with C-Banding Techniques

Cited by 16 publications

References 26 publications

Chromosome relationships and breeding barriers in New Zealand species ofRanunculus

Chromosome relationships and breeding barriers in New Zealand species ofRanunculus

Numerical analyses of seed morphology and its taxonomic significance in the tribe Nigelleae (Ranunculaceae)

A floating spherical gaussian orbital model for polymers: I. general formalism and computational procedure

Contact Info

Product

Resources

About