Fertility improvement in tetraploid pearl millet |
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Authors: | M Dujardin W W Hanna |
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Institution: | (1) Dept. of Agronomy, Univ. of Georgia, Coastal Plain Exp. Station, 31793 Tifton, GA, USA;(2) USDA-ARS, Coastal Plain Exp. Station, 31793 Tifton, GA, USA |
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Abstract: | Summary Autotetraploid (2n=4x=28) pearl millet inbred lines, Tift 23BE and Tift 239DB, have been developed for use in crosses with other polyploid Pennisetum species. Each line set less than 1% and 3% selfed and open-pollinated seed, respectively. Seed germination was usually less than 17%. First generation (F1) hybrids between the two inbreds set up to 61% seed while up to 40% of the seed from hybrids germinated.Seed weight per inflorescence for two planting dates averaged 0.32 g and 3.06 g for the two inbreds and the second generation F2 progeny, respectively. One hundred seed weight was also significantly higher (0.78 g vs 0.48 g) in the F2 progeny, probably due better endosperm development. Chromosome behavior and pollen stainability were similar in the inbred parents and hybrids. However, the hybrids shed more pollen than the inbred parents.Heterosis was evident in the F1 hybrids and F2 progeny which showed significant increases in plant height, leaf length, leaf width, and inflorescence length in addition to fertility improvement. |
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Keywords: | Pennisetum chromosomes heterozygosity seed set |
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