A New Basic Chromosome Number for the Genus Brachiaria (Trin.)Griseb. (Poaceae: Panicoideae: Paniceae) |
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| Authors: | Claudicéia Risso-Pascotto Maria Suely Pagliarini Cacilda Borges do Valle |
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| Institution: | (1) Department of Cell Biology and Genetics, State University of Maringá, 87020-900 Maringá, PR, Brazil;(2) Embrapa Beef Cattle, P.O. Box 154, 79002-970 Campo Grande, MS, Brazil |
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| Abstract: | The genus Brachiaria (Trin.) Griseb. has been characterized as having two basic chromosome numbers to this date: x = 7 and x = 9, with the predominance of the latter. Cytological studies performed on five accessions of Brachiaria dictyoneura (Fig. et De Not.). Stapf revealed a new chromosome number for the genus, x = 6. The origin of x = 6 is still unknown. All accessions examined for this species presented 2n = 24 and typical meiotic abnormalities of polyploids. The use of such accessions in the Brachiaria hybridization breeding program is discussed. |
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| Keywords: | Basic chromosome number Brachiaria dictyoneura Grass breeding Meiosis Polyploidy |
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