NDLI: Abnormal meiosis in tetraploid genotypes ofBrachiaria brizantha (Poaceae) induced by colchicine: its implications for breeding

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Journal of Applied Genetics : Volume 50, Issue 1, March 2009

Journal of Applied Genetics : Volume 49

Journal of Applied Genetics : Volume 48

Journal of Applied Genetics : Volume 47

Abnormal meiosis in tetraploid genotypes ofBrachiaria brizantha (Poaceae) induced by colchicine: its implications for breeding

Content Provider	Springer Nature Link
Author	Mendes Bonato, A. B. Felismino, M. Ferrari Kaneshima, A. M. Souza Pessim, C. Calisto, V. Pagliarini, M. Suely Valle, C. Borges
Copyright Year	2009
Abstract	Meiotic behavior was analyzed in 6 progenies from 3 artificially induced tetraploid (2n = 4x = 36) sexual genotypes (C31, C41, and C48) of the normally apomicticBrachiaria brizantha (Hochst. ex A. Rich.) Stapf., syn.Urochloa brizantha (Hochst. ex A. Rich.) R. Webster. These are key plants to allow intraspecific hybridization of this important forage species, widely used for pastures in the tropics. The percentage of abnormal cells among the plants ranged from 39.8% to 63.2%. In the single plant derived from C48, only the common meiotic abnormalities typical of polyploids were observed, while in plants derived from C31 and C41, a distinct behavior was found. In the majority of cells of those plants, the chromosomes remained scattered in the cytoplasm in the first division, without forming a metaphase plate. This abnormality blocked chromosome movements at anaphase I. Several micronuclei of various sizes were formed and, after the occurrence of an irregular first cytokinesis, the meiocytes progressed normally to the second division, generating polyads with unbalanced microspores. Pollen viability was not correlated with meiotic abnormalities. The importance of these findings to theBrachiaria breeding program is discussed. The sexual progeny of C48 seems most suitable as female parents to be used in intra-and interspecific hybridization.
Starting Page	83
Ending Page	87
Page Count	5
File Format	PDF
ISSN	12341983
Journal	Journal of Applied Genetics
Volume Number	50
Issue Number	2
e-ISSN	21903883
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Brachiaria brizantha breeding program colchicine forage grass induced tetraploidy microsporogenesis Life Sciences Animal Genetics and Genomics Human Genetics Microbial Genetics and Genomics Plant Genetics & Genomics
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine

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