Non-Mendelian transmission of apomixis in maize-Tripsacum hybrids caused by a transmission ratio distortion.
Heredity (Edinb)
; 80 ( Pt 1): 40-7, 1998 Jan.
Article
em En
| MEDLINE
| ID: mdl-9474775
Apomixis is a mode of asexual reproduction through seeds. The apomictic process bypasses both meiosis and egg cell fertilization, producing offspring that are exact genetic replicas of the mother plant. In the Tripsacum agamic complex, all polyploids reproduce through the diplosporous type of apomixis, and diploids are sexual. In this paper, molecular markers linked with diplospory were used to analyse various generations of maize-Tripsacum hybrids and backcross derivatives and to derive a model for the inheritance of diplosporous reproduction. The results suggest that the gene or genes controlling apomixis in Tripsacum are linked with a segregation distorter-type system promoting the elimination of the apomixis alleles when transmitted through haploid gametes. Hence, this model offers an explanation of the relationship between apomixis and polyploidy. The evolutionary importance of this mechanism, which protects the diploid level from being invaded by apomixis, is discussed.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Grão Comestível
/
Genes de Plantas
/
Zea mays
Idioma:
En
Revista:
Heredity (Edinb)
Ano de publicação:
1998
Tipo de documento:
Article
País de afiliação:
México
País de publicação:
Reino Unido