Journal
JOURNAL OF RADIATION RESEARCH
Volume 51, Issue 3, Pages 223-233Publisher
OXFORD UNIV PRESS
DOI: 10.1269/jrr.09143
Keywords
Ion beam; Mutation; Plant; Mutation breeding; Biological effect; LET
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Recently, heavy ions or ion beams have been used to generate new mutants or varieties, especially in higher plants It has been found that ion beams show high relative biological effectiveness (RBE) of growth inhibition, lethality. and so on. but the characteristics of ion beams on mutation have not been clearly elucidated To understand the effect of ion beams on imitation induction, mutation rates were investigated using visible known Arabidopsis mutant phenotypes. indicating that mutation frequencies induced by carbon ions were 20-fold higher than by electrons In chrysanthemum and carnation, flower-color and flower-form mutants, which are hardly produced by gamma rays cm X rays. were induced by ion beams Novel mutants and their responsible genes, such as UV-B resistant. serrated petals and sepals, anthocyaninless. etc were induced by ion beams. These results indicated that the characteristics of ion beams for mutation induction are high mutation frequency and broad mutation spectrum and therefore, efficient induction of novel mutants On the other hand. PCR and sequencing analyses showed that half of all mutants induced by ion beams possessed large DNA alterations, while the rest had point-like mutations. Both mutations induced by ion beams had a common feature that deletion of several bases were predominantly induced. It is plausible that ion beams induce a limited amount of large and irreparable DNA damage. resulting in production of a null mutation that shows a new mutant phenotype
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