X-Ray and Ultraviolet Studies on Pollen Tube Chromosome: II The Quadripartite Structure of the Prophase Chromosomes of Tradescantia.
نویسنده
چکیده
2 Stern, C., Zeit. f. i. Abst. u. Vererb., 52, 373 (1929). 3 Bridges, C. B., Ibid., 60, 207 (1932). 4 Schultz, J., and Bridges, C. B., Amer. Nat., 66, 323 (1932). 6 Beadle, G. W., andcEphrussi, Boris, Proc. Nat. Acad. Sci., 22, 536 (1936). 6 Beadle, G. W., Physiol. Rev., 25, 643 (1945). 7 Beadle, G. W., and Coonradt, V. L., Genetics, 29, 291 (1944). 8 Beadle, G. W., and Tatum, E. L., Amer. Jour. Bot., 32, 678 (1945). 9 Mitchell, H. K., and Houlahan, M. B., Fed. Proc., in press. 0 Loring, Hubert S., and Pierce, John G., Jour. Biol. Chem., 153, 61 (1944). 11 Doermann, A. H., Arch. Biochem., 5, 373 (1944). 12 Beadle, G. W., Chem. Rev., 37, 15 (1945). 13 Wright, S., Physiol. Rev., 21, 487 (1941).
منابع مشابه
Differential Sensitivity of Prophase Pollen Tube Chromosomes to X-rays and Ultraviolet Radiation
1. Through use of the pollen tube technique it has been possible to study the sensitivity of prophase stages to x-rays and ultraviolet, and to correlate the varying sensitivity with changes in the generative nucleus of Tradescantia. 2. Sensitivity to ultraviolet decreases from the 2 hour stage until at 11 hours after germination there is no further production of breaks. The 0 and 1 hour stages ...
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T WAS recently found (NEBEL and RUTTLE, in press) that Tradescantia I reflexa Raf. shows four threads1 per chromosome during all somatic as well as during all premeiotic stages. Multiplication of threads occurs a t metaphase during somatic division (fig. I). In meiosis of T . reflexa the four threads multiply a t early interkinesis and do not do so again until the metaphase of the first pollen ...
متن کاملThe Effects of Ultraviolet and X-Ray Treatment on the Pollen Tube Chromosomes of Tradescantia.
HE cytogenetic interest in ultraviolet radiation resides in the hope T that the qualitatively discriminating nature of this type of radiant energy will yield still further evidence as to the structure and behavior of the hereditary mechanism. It is now known that ultraviolet, like X-rays, can produce gene mutations and chromosomal changes; it is likewise known that, unlike X-rays, ultraviolet i...
متن کاملTradescantia micronucleus bioassay and pollen tube chromatid aberration test for in situ monitoring and mutagen screening.
The meiotic pollen mother cells (PMC) of Tradescantia (spiderwort) are highly synchronized in their prophase I and tetrad stages. Chromosomes of this stage are sensitive to physical or chemical mutagens. Thus high frequency of acentric fragments or sticky chromosomes can be induced with very low level of mutagens. These induced chromosome aberrations become micronuclei (MCN) in the synchronized...
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Stadler, L. J., "The Comparison of Ultra-Violet and X-ray Effects on Mutation," Cold Spring Harbor Symp. Quant. Biol., 9, 188-177 (1941). Stadler, L. J., and Uber, Fred M., "Genetic Effects of Ultra-Violet Radiation in Maize. IV. Comparison of Monochromata Radiations," Genetics, 27, 84-118 (1942). Stadler, L. J., and Roman, Herschel, "The Effect of X-rays upon Mutation of the Gene A in Maize," ...
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ورودعنوان ژورنال:
- Proceedings of the National Academy of Sciences of the United States of America
دوره 33 8 شماره
صفحات -
تاریخ انتشار 1947