EurekaMag.com logo
+ Site Statistics
References:
48,253,228
Abstracts:
22,798,842
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Trends of chromosome evolution in family commelinaceae


, : Trends of chromosome evolution in family commelinaceae. Nucleus (Calcutta) 27(3): 231-241

Taxa (24) belonging to 12 spp. under 8 genera, representing members of both the tribe Commelineae and Tradescanticae, were studied. Different populations belonging to the representative species were collected. In view of the profuse vegetative propagation and almost obsolete sexual reproduction in the family, a study of the population-wise differences in these species was called for, both in the finer details of chromosome structure and behavior and the phenotypic differences, if any, among populations growing in different areas of the subcontinent. Three sizes of chromosomes have been observed among the taxa studied, the smallest being in Murdannia, medium sized in Commelina and culminating in the long chromosomes of Callisia, Rhoco, Setcreasea and Zebrina. Commelineae and Tradescanticae are characterized by 2 haploid sets of chromosomes; the former having x = 10, 11, 12, 13 and 15 or multiples of them and the latter mostly x = 6 with occasional polyploidy. There is a remarkable constancy in chromosome number commenlinaceae in spite of minor phenotypic differences and wide distribution in various climatic zones. The constancy of the particular chromosome set might have some adaptive value leading to selective advantage. In Commenlineae, there are minute karyotypic differences as evidenced by their karyotype formula, along with evidences of polyploidy. Both polyploidy and structural alteration have been effective in the evolution of species as well as intraspecific genotype. A study of the karyotypes in Tradescantieae indicates that rearrangement of chromosome segments has played a significant role in the evolution of populations. Such rearrangement may lead to non-homology of segments giving rise to univalents noted in meisois. Structural alterations and possibly hybridity have affected the number of chromosomes with secondary constriction. Tradescantieae has a distinct karyotype, which had undergone considerable alteration and rearrangement during evolution. Cryptic changes in karyotypes have been responsible for the origin of intraspecific races. In both tribes, the various populations studied showed a constancy in chromosome number with a marked change in their chromosome structure. These changes may be minute rearrangements of chromosome parts in certain taxa and addition or dejection of segments in the other. These, along with polyploidy and hybridization, may be responsible for the evolution of new strains. Populations or intraspecific races. The 2 must have diverged quite early during the evolution of the family.

(PDF 0-2 workdays service)

Order PDF Full Text

Close
Close

Click here to order any other PDF Full Text


Accession: 006839576

PDF Full Text: Submit


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Other references

Zaher, M. A.; Moussa, M. A., 1963: Effect of larval crowding on the cutworm, Agrotis ypsilon Rott. (Lepidoptera: Agrotidae). The following is based almost entirely on the authors' summary of this account of studies on the effect of crowding on larvae of Agrotis ipsilon (Hfn.) in Egypt. Larvae reared under crowded conditions, but not the adults to which they gave ri...

Fraval, A., 1969: La jaunisse apicale du pois: connaissances actuelles sur l'ecologie de cette maladie transmise par aphides. Annls Zool Ecol anim, 1: 357-369

Essig M.; Bodden R.; Housch T.; Koulourides T., 1989: Plaque ph in relation to enamel fluoride f and plaque thickness. Journal of Dental Research 68(SPEC ISSUE): 318

Wakabayashi, Ichiro; Masuda, Hiroshi, 2007: Association of pulse pressure with fibrinolysis in patients with type 2 diabetes. Introduction: Pulse pressure is a potent risk factor for atherosclerotic disease. The purpose of this cross-sectional study was to determine whether pulse pressure is associated with blood coagulation and fibrinolysis in patients with diabetes.Mat...

Szopa J.S.; Ganczyk B.; Kowal K.; Zwolinski G., 1990: Melibiose fermenting osmotolerant saccharomyces cerevisiae hybrids. A haploid generation of opposite mating types a and was isolated from sporulating Saccharomyces cerevisiae industrial yeasts. Haploid yeasts fermenting melibiose and osmotolerant haploids were selected from the C-2 strain used in the production of...

Varo Galvan, P.; Guillem Sempere, C.; Garcia Romero, A., 1998: Analytical evaluation of basic nutritional composition in school menus. The school people have a special importance in the nutritional studies because several factors, as are: biologics, psycologics and socials. In this form the school menus have a very important because uses for assuray the variety of meals in the di...

Sanchez, L. A.; Ataroff, M.; Lopez, R., 2002: Soil erosion under different vegetation covers in the Venezuelan Andes. This comparative study of soil erosion considered different environments in an ecological unit of the Venezuelan Andes. The soils belong to an association of Typic Palehumults and Humic Dystrudepts. Soil losses were quantified by using erosion plo...

Ishiwata, K.; Seki, H.; Ishii, S.; Ishii, K.; Nozaki, T.; Senda, M., 1994: Synthesis and in vivo characteristics of semotiadil, a calcium antagonist. Journal of Labelled Compounds & Radiopharmaceuticals 35(0): 507-509

Hargreaves, C. L.; Foggo, M. N.; Smith, D. R.; Gordon, M. E., 1999: Development of protocols for the cryopreservation of zygotic embryos of Pinus radiata and subsequent plant regeneration. Whole zygotic embryos of Pinus radiata evaluated for survival after storage in liquid nitrogen (-196 degrees C). Zygotic embryos were cryoprotected with selected levels of sorbitol and dimethyl sulfoxide (DMSO) and were then frozen, employing an i...

Richelson, Elliott, 2013: Multi-modality a new approach for the treatment of major depressive disorder. Effective treatment with antidepressants is currently limited by factors that affect treatment compliance, including delay in onset of therapeutic effects and intolerable side-effects. Recent data suggest that use of antidepressant combinations wi...