scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Vitamins: Their Property of Inducing Chromosome Division in Adulty Cells of Plants

01 Jan 1956-Caryologia (Firenze University Press)-Vol. 9, Iss: 1, pp 38-53
TL;DR: L'uso di vitamine puo alterare il normale decorso della mitosi, con differenziazione di cellule poliploidi, frammentazione e agglutinazione cromosomica, e puo anche indurre divlsioni « riduzionali ».
Abstract: RIASSUNTOGli Aa. hanno sperimentato l'azione citologica di varie sostanze, come acido nicotinico, acido succinico, tiamina e pentotenato di calcio, e hanno osservato che l'uso di vitamine puo alterare il normale decorso della mitosi, con differenziazione di cellule poliploidi, frammentazione e agglutinazione cromosomica, e puo anche indurre divlsioni « riduzionali ».
Citations
More filters
Journal ArticleDOI
TL;DR: The evolution of Chromosome Structure and the Origin of Agricultural Strains in Crop Plants and its Significance in Speciation are studied.
Abstract: Introducction 514 Types of Chromosomal Change in Relation to Speciation 516 Diminution in Chromatin as an Indication of Structural Changes in Chromosomes 518 Karyotypic Changes and the Origin of Agricultural Strains in Crop Plants 520 Fragmentation of Chromosomes as a Physical Basis of Speciation 521 A Tentative Suggestion Regarding the Evolution of Chromosome Structure 524 Inconstancy in Chromosome Complements within a Tissue and its Significance in Speciation 526 Conclusion 532 Further Research 534 References 5 35

46 citations

Journal ArticleDOI
TL;DR: The diploid somatic chromosome number in Ph. vulgaris L. vulgari is 2n=22, whereas, the polytene chromosomes found in the endopolyploid cells of the roots vary between 7μ and 60μ.
Abstract: The diploid somatic chromosome number in Ph. vulgaris L. is 2n=22, the length varies between 0.8-2.8μ, whereas, the polytene chromosomes found in the endopolyploid cells of the roots vary between 7μ and 60μ. Their cytological and cytochemical behaviour has been discussed including differential Giemsa staining and autoradiography. Function of these cells may be considered as “transfer as well as secretary gland”.

3 citations

Book ChapterDOI
01 Jan 1980
TL;DR: This chapter explains the effects of physical and chemical agents on chromosomes and some serious limitations of the use of chemical agents for induction of synchrony, such as, the chromosome damage and toxicity often caused by those chemicals.
Abstract: Publisher Summary This chapter explains the effects of physical and chemical agents on chromosomes. In a logarithmically growing cell population, several methods of analysis present serious problems because of nonsynchrony of cell division. The principle involved in induced synchrony is to allow all the cells to start DNA replication simultaneously. The chemical methods appear to be more promising in inducing synchronization as specially noted in the case of mammalian cells. With this object in view, methods have been devised to cause thymine deficiencies, thus, blocking DNA replication. However, the synchronization cannot be considered as complete because of the differential susceptibility of the different phases. After treatment, the cells in G1 remain in the same phase, while those in the later phases, complete their cycle and are blocked prior to the succeeding S phase. Cells in the S phase, on the other hand, are heterogeneous in the sense that a few percent of the cells are at the beginning, some at the middle, and some at the end of the S phase. There are some serious limitations of the use of chemical agents for induction of synchrony, such as, the chromosome damage and toxicity often caused by those chemicals.