+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Ranunculus ficaria 5. cyto embryological analysis of ranunculus ficaria ssp calthifolius with b chromosomes

, : Ranunculus ficaria 5. cyto embryological analysis of ranunculus ficaria ssp calthifolius with b chromosomes. Acta Biologica Cracoviensia Series Botanica 23: 83-96

Two Hungarian mixed populations of the diploid taxon R. ficaria L. ssp. calthifolius (Rchb.) Arc. (2n = 16) and the tetraploid R. ficaria L. ssp. bulbifer (Marsden-Jones) Lawalree (2n = 32) were studied cytologically. B-chromosomes were discerned in some diploids only, in the number ranging from 1-8. They distinctly differed morphologically from the chromosomes of the basic A-set. Also different was their meiotic behavior. B-univalents (bivalents only sporadically) were observed in diakinesis and in the I metaphase; disturbed distribution to the poles and laggards in the I anaphase as well as abnormal tetrads with microcytes are the most characteristic features of microsporogenesis. Disturbances were observed also in macrosporogenesis. The resulting spores and afterwards male and female gametophytes showed cytological differentiation with regard to the number of B-chromosomes. No effect of B-chromosomes on pollen viability could be observed except their highest number (8 B-chromosomes) which decreased the viability of pollen. Regardless of presence of B-chromosomes, normal 7-nucleate embryosae and well-developed achenes were formed.


Other references

McKeown, S.; Williams, A.; Pauker, K., 2017: Stories that move them: Changing children's behaviour toward diverse peers. Globally, our social worlds are becoming increasingly racially and ethnically diverse. Despite this, little attention has been given to how children negotiate this diversity. In this study we examine whether a value-in-diversity storybook interven...

Baur, A.; Stäbler, A.; Psenner, K.; Hamburger, C.; Reiser, M., 1997: Imaging findings in patients with ventral dural defects and herniation of neural tissue. The aim of this paper is to describe clinical and imaging findings in three patients with ventral dural defects and herniation of the spinal cord or cauda equina. The literature is reviewed and the clinical, radiological and operative findings are...

Rentz, D.C., 1964: Pidonia scripta from oak bark. Pan Pac Entomol 40(10): 63-64

Klein, R., 1962: Human fetal splenic and thymic reticulo-lymphocytic islands and the origin of immunity mechanisms. Comptes Rendus des Seances de la Societe de Biologie et de Ses Filiales 156: 1623-1626

Levins R., 1970: Complex systems. Waddinton, C H (Edited By) Towards A Theoretical Biology No 3: Drafts An International Union Of Biological Sciences Symposium on General Biology 253p Illus Aldine Publishing Co : Chicago, Ill , U S A 73-88

Weber, T.J., 2003: HIPAA privacy compliance deadline quickly approaching. Pennsylvania Dental Journal 70(2): 31-32

Ewert, R.; Opitz, C.; Wensel, R.; Dandel, M.; Mutze, S.; Reinke, P., 2002: Abnormalities of pulmonary diffusion capacity in long-term survivors after kidney transplantation. Study objectives: Alterations in pulmonary function and interstitial changes in the lungs of renal transplant recipients have been described, but prospective longitudinal data are lacking. Design: A prospective analysis of pulmonary function tests...

Konno, N.; Takahashi, H.; Nakajima, M.; Takeda, T.; Sakamoto, Y., 2012: Characterization of β-N-acetylhexosaminidase (LeHex20A), a member of glycoside hydrolase family 20, from Lentinula edodes (shiitake mushroom). We purified and cloned a β-N-acetylhexosaminidase, LeHex20A, with a molecular mass of 79 kDa from the fruiting body of Lentinula edodes (shiitake mushroom). The gene lehex20a gene had 1,659 nucleotides, encoding 553 amino acid residues. Sequence...

Weidauer, H.; Hildmann, H.; Steinbach, E., 1971: Enzyme histochemical studies on the metabolism of preserved tympanic membrane-fascial homografts. Archiv für Klinische und Experimentelle Ohren- Nasen- und Kehlkopfheilkunde 198(3): 285-292

Carroll, L.; Sullivan, F.M.; Colledge, M., 1999: Good health care: patient and professional perspectives. Many health needs assessment exercises are professionally led, employing complex epidemiological methods. An alternative method that gives valuable information about patient preferences is a forced-choice questionnaire, which this study used in fi...