Seeds of
T. monococcum (2X),
T. durum (4X) and
T. aestivum (6X), with and without enrichment of
10B were exposed to thermal neutrons or X-rays. The RBE values of heavy particles from
10B (n, α)
7Li reaction compared with X-rays were determined at each ploidy level for reductions in seedling height and seed setting in the M
1 generation and also with respect to induction of chlorophyll mutations in the M
2 generation. The RBEs reported here are generally lower than those reported earlier for the use of re-dried seeds. Although no definite relationship was found between RBE values and ploidy levels, thermal neutrons were very effective in
10B-enriched seeds with respect to induction of chlorophyll mutations even in the hexaploids. There was a positive relation between the occurrence of the M
1 spike mutations and of chlorophyll or skipe mutations among their progenies, especially in thermal neutron treatments of
10B-enriched seeds. The relative biological effectiveness and the tolerance of the polyploids were discussed and compared with other results reported in the literature.
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