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SPONTANEOUS AND INDUCED CHROMOSOME BREAKAGE IN CLAYTONIA VIRGINICA
Author(s) -
Star Aura E.
Publication year - 1970
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1970.tb09918.x
Subject(s) - biology , nucleic acid , population , breakage , cytosine , adenosine , thymidine , thymine , guanosine , biochemistry , dna , materials science , demography , sociology , composite material
Meiocytes in three morphologically similar but cytologically different wild populations of Claytonia virginica L. were examined. Over a three‐year period levels of spontaneous chromosome breakage were consistent for each population but differed between populations. Random samples of inflorescences from two of the populations were treated with 0.005 % aqueous solutions of nucleic acid precursors: adenine, adenosine, thymine, thymidine, guanosine 5'‐monophosphate (GMP), and cytosine 5'‐monophosphate (CMP). Statistically significant increases in chromosome breakage were observed in the population with little background breakage when inflorescences were treated with adenosine, thymine, thymidine, GMP, and CMP. In the population with moderate spontaneous breakage, a significant increase was observed only in plants treated with adenosine. Breakage induced with nucleic acid precursors was similar to that which occurred spontaneously; the predominant aberration was the single bridge.