Binary Variation in Tradescantia Bracteata
نویسندگان
چکیده
منابع مشابه
Dna in Gametogenesis and Embryogeny in Tradescantia
A microphotometric study of various Feulgen-stained gametophytic and sporophytic nuclei of Tradescantia paludosa was made to test the hypothesis that DNA is maintained in multiples of a basic unit within all cells of an organism. A multiple relationship was found in all tissues analyzed. The lowest amount of DNA was found in gametophytic nuclei, approximately twice and four times this amount in...
متن کاملChromosome Behavior and Nuclear Development in Tradescantia.
COMPARISON of microsporogenesis and microspore development A in a triploid Tradescantia has shown significant deviations from the normal diploid behavior. Occasional dicentric chromatids a t meiosis are found in diploid Tradescantias, but inversion crossovers in the triploid are much more frequent. An analysis of microspore development in a triploid Tradescantia shows that chromosome number has...
متن کاملSegmental Interchange in Chromosomes of Tradescantia.
Chromosome ring formation has been found in a number of difierent genera. In certain species of Oenothera and of Hypericum and in the monotypic genus Rhoeo, all the chromosomes may be united in a single ring or chain a t meiosis. Ring formation is maintained in these plants by a system of balanced lethals. In Datura, Zea, Pisum and Campanula rings of four or more chromosomes have been described...
متن کاملSpontaneous Chromosome Aberrations in Triploid Tradescantia Hybrids.
T HAS recently been found that chromosome aberrations of the types I induced by various kinds of radiations occur spontaneously during the development of the pollen grains in diploid species and especially in species hybrids of Tradescantia (GILES 1940). The present studies have shown that the frequency of these aberrations is even higher in triploid Tradescantia hybrids. Furthermore, it has be...
متن کاملAntiarthritis Activity of Aristolochia Bracteata Extract in Experimental Animals
The Aristolochia bracteata is well known for its antiarthritis properties in Indian system of medicine and folk medicine. The objective of the present study was to evaluate its folk claim in rheumatoid arthritis (RA) and propose a probable mechanism of action. Anti arthritic activity was evaluated using Freund’s complete adjuvant in rats, the course of treatment was followed for over and 4 week...
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ژورنال
عنوان ژورنال: Annals of the Missouri Botanical Garden
سال: 1941
ISSN: 0026-6493
DOI: 10.2307/2394268