Quantitative nuclear DNA changes inEleusine (Gramineae) |
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Authors: | S C Hiremath S S Salimath |
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Institution: | (1) Department of Botany, Karnatak University, 580003 Dharwad, India;(2) Present address: Cell. & Mol. Genetics Lab., Department of Botany, University of Delhi, 11007 Delhi, India |
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Abstract: | 2C nuclear DNA amounts were determined in 30 collections belonging to 10 species ofEleusine. About a 2.5-fold variation in genome size is evident in the genus. The 2C DNA amount in the diploid species ranged from 2.50 pg inE. verticillata to 3.35 pg inE. intermedia. In contrast, the tetraploid species showed a range from 4.95 pg inE. africana to 6.13 pg inE. floccifolia. At intraspecific level 10 collections ofE. coracana, 6 ofE. indica, 4 ofE. africana, 2 ofE. tristachya, and 2 ofE. kigeziensis did not show any significant variation. However, 2 collections ofE. floccifolia, connected with polyploidy, displayed about 90% variation. Polyploid species showed approximately double the genome size of that of their corresponding diploids. An evolutionary increase in DNA amount is evident inE. coracana during the course of its origin and domestication fromE. africana. |
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Keywords: | Angiosperms Gramineae Eleusine DNA amount intra- and interspecific variation karyotypes hybridisation polyploidy domestication evolution |
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