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Trisomics of garden pea (Pisum sativum L.) readily respond to selection for increased fertility.
Dokl Biol Sci
February 2009
Institute of Cytology and Genetics, Siberian Branch, Russian Academy ofSciences, ul. Akademika Lavrent'eva 10, Novosibirsk, 630090 Russia.
Tertiary trisomics in the garden pea as a model of B chromosome evolution in plants.
Heredity (Edinb)
December 2003
Institute of Cytology & Genetics, Siberian Division of Russian Academy of Sciences, Acad. Lavrentiev Avenue 10, Novosibirsk 630090, Russia.
It is hypothesized that, in plants, genetically empty B chromosomes may originate from the extra chromosome (E) of tertiary trisomics if (i) the region of basic chromosomes homologous to the E (H-region) harbors a sporophytic lethal covered by the wild-type allele in E, and (ii) crossing-over between E and the H-region is suppressed. Under these conditions, most loss-of-function mutations occurring in the H-region are deleterious for haploid gametophytes, whereas those occurring in E are neutral or advantageous for hyperploid (n+1) gametophytes. As a result, natural selection at the gametophyte level can lead to the degeneration of E, leaving the H-region intact.
View Article and Find Full Text PDFGenetics and mapping of new isozyme loci in Vicia faba L using trisomics.
Theor Appl Genet
October 1995
C.I.D.A., Departamento de Mejora y Agronomía, Aptdo 4240, 14080, Córdoba, Spain.
Polymorphism in ten enzyme systems (ACO, ACP, AAT, EST, FK, ME, NAG, PRX, 6PGD, and SOD) in Vicia faba L. was analyzed, revealing 13 loci, six of which have not been reported before. Inheritance, genetics, possible location, and linkage analysis were studied in 13 different F(2) populations trisomic for four of the six chromosomes (nos.
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