Induction of mutants related to agronomic characters by gammma-ray irradiation in foxtail millet (Setaria italica (L.) P. Beauv.)
2003
Ichitani, K. (Kagoshima Univ. (Japan)) | Takayama, Y. | Sato, M. | Hashimoto, F. | Ishiguro, E. | Sakata, Y.
Summary Several mutants related to agronomic characters were induced by gamma-ray irradiation in foxtail millet. In the present study, inheritance and features of these mutants were analyzed. The mutants obtained were: one early heading mutant, one low seed set mutant, one abnormal panicle mutant and three multiple panicle mutants. The early heading mutant headed earlier than cultivars planted in Europe, which are considered to be among the earliest cultivars. The earliness of the mutant was caused by recessive gene (s) . The early heading mutant keeps elongating internodes just after germination. No recombinant between early heading and elongating internodes has appeared, suggesting that the early heading time gene (s) has a pleiotropic effect on internode elongation. The other mutant traits were also caused by recessive genes. The multiple panicle mutants and the aberrant panicle mutant showed complicated inheritance, suggesting the expression of genes conferring these traits are unstable, strongly influenced by environmental factors.
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