A New Basic Chromosome Number for the Genus Brachiaria (Trin.)Griseb. (Poaceae: Panicoideae: Paniceae)

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...

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Bibliographic Details
Published in:Genetic resources and crop evolution 2006-02, Vol.53 (1), p.7-10
Main Authors: Risso-Pascotto, Claudicéia, Pagliarini, Maria Suely, do Valle, Cacilda Borges
Format: Article
Language:English
Subjects:
Abnormalities
Brachiaria
Chromosome number
Chromosomes
Hybridization
Meiosis
Polyploidy
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Summary: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.
ISSN:0925-9864
1573-5109
DOI:10.1007/s10722-005-7762-4