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The 'A' genome donor of Eleusine coracana (L.) Gaertn. (Gramineae)


, : The 'A' genome donor of Eleusine coracana (L.) Gaertn. (Gramineae). Tag. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik 84(5-6): 747-754

In an attempt to discover 'A' and 'B' genome donor(s) to finger millet, Eleusine coracana, or its progenitor species, E. africana (both allotetraploid 2n = 4x = 36), five diploid species, E. indica, E. floccifolia, E. multiflora, E. tristachya and E. intermedia, were crossed to finger millet and its progenitor taxon. Crosses were successful only with E. coracana. Three combinations of triploid hybrids E. coracana X E. indica, E. coracana X E. floccifolia, and E. coracana X E. multiflora were obtained and analysed. Meiotic behaviour was perfectly normal in parental species. The regular number of 18 bivalents in E. coracana, 9 bivalents in E. indica, E. intermedia, E. tristachya and E. floccifolia and 8 bivalents in E. multiflora were invariably noticed. In E. coracana X E. indica hybrids a mean chromosome pairing of 8.84(I) + 8.80(II) + 0.03(III) + 0.10(IV) per cell was found. About 86.5% of the cells showed the typical 9(I) + 9(II) configuration, suggesting that E. indica (AA) is one of the diploid genome donors to cultivated species E. coracana. A mean chromosome pairing of 11.08(I) + 7.63(II) + 0.16(III) + 0.04(IV) per cell was found in E. coracana X E. floccifolia hybrids. Two to ten bivalents and varying numbers of univalents were seen in 55% of the cells. About 45% of the cells showed the 9(I) + 9(II) configuration. Various evidence suggests that perennial E. floccifolia is a primitive member of the 'A' genome group of Eleusine species, and it may not be a genome donor to E. coracana. In E. coracana X E. multiflora hybrids (2n = 26) mean chromosome pairing of 21.45(I) + 1.97(II) + 0.13(III) + 0.04(IV) per cell was found. About 91% of the cells were observed to have 20-26 univalents. Only a small percentage of the cells contained bivalents or multivalents. This pairing behaviour indicates that E. multiflora lacks genomic homology with the 'A' or 'B' genome of E. coracana. Genomically E. multiflora is a distinct species and a genomic symbol of 'C' is assigned to it. Identification of the 'B' genome donor species to cultivated millet. E. coracana remains elusive.

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Accession: 002241071

PMID: 24201369

DOI: 10.1007/BF00224180

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