The sexual reproductive ability of a forest exposed to low level ionizing radiation is dependent on the sensitivity of primordial differentiation, meiotic processes leading to the formation of gametes, fusion of the gametes, and subsequent growth of the sporophytic generations. In this report it was shown that the initiation of reproductive primordia in Pinus rigida, Quercus ilicifolia, Quercus alba and Quercus coccinea is not unusually sensitive to irradiation. Trees which had been severely damaged by chronic low level ionizing radiation (4 to 12 r/20 hr day) were able to differentiate floral structures and produce viable seed. However, flower phenology was …
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Added Title:
Brookhaven National Laboratory Report BNL-6467
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The sexual reproductive ability of a forest exposed to low level ionizing radiation is dependent on the sensitivity of primordial differentiation, meiotic processes leading to the formation of gametes, fusion of the gametes, and subsequent growth of the sporophytic generations. In this report it was shown that the initiation of reproductive primordia in Pinus rigida, Quercus ilicifolia, Quercus alba and Quercus coccinea is not unusually sensitive to irradiation. Trees which had been severely damaged by chronic low level ionizing radiation (4 to 12 r/20 hr day) were able to differentiate floral structures and produce viable seed. However, flower phenology was retarded, and pronounced morphological aberrations were present. It is suggested that this delay may be the result of a reduction of endogenous growth substances.
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Trees in a natural pitch pine-oak forest have been exposed to varying amounts of low-level chronic gamma radiation for several years. Responses range from lethality to minute morphological changes, depending upon dose rate and species. The cumulative effects of low-level chronic gamma radiation on male and female flowers. pollen production. pollen germination and development of seedlings from seeds of irridiated mother trees are described. (C.H.)
Mergen, Francois & Stairs, G. R.Cumulative Radiation Effects of Sexual Reproduction in Pine and Oak,
report,
1962;
Washington D.C..
(https://digital.library.unt.edu/ark:/67531/metadc1256961/:
accessed June 10, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.