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Stable cytoplasmic male sterile mutants induced in cultivar tift 23db 1 pearl millet pennisetum americanum with mitomycin and streptomycin



Stable cytoplasmic male sterile mutants induced in cultivar tift 23db 1 pearl millet pennisetum americanum with mitomycin and streptomycin



Crop Science 22(3): 651-652



Stable cytoplasmic male-sterile [cms] lines are necessary for the commercial production of F1 hybrid seed of important crop plants such as sorghum (Sorghum bicolor L.) and pearl millet [P. americanum (L.) Leeke]. An attempt was made to ascertain if streptomycin and mitomycin could help to create stable cms mutants. Seeds of 'Tift 23DB1' pearl millet were soaked in water solutions of 200 and 500 ppm of streptomycin, and 50 ppm of mitomycin at 5.degree. C for 40 h. Treated seeds were rinsed in tap water, surface dried and planted in an isolated field along with a check of untreated seed. Head populations of 32,800, 22,300, 18,000 and 13,000 from seed treated with 0, 200, 500 ppm of streptomycin and 50 ppm of mitomycin contained progeny tested stable cms mutants at frequencies of 1 in 16,200, 5575, 4500 and 2600, respectively. The sterility or fertility of cms mutants crossed with 2 sterility maintainers and 6 fertility restorer inbreds of pearl millet suggests that the induced mutants have sterility maintainer and fertility restorer requirements similar to cms 'Tift 23DA1' and are similar cms mutants.

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