Inheritance and genetic diversity of some enzymes in the sexual and diploid pool of the agamic complex of Maximae (Panicum maximum Jacq., P. infestum Anders. and P. trichocladum K.Schum.)

Assienan, B.; Noirot, Michel; Gnagne, Y. M.

doi:10.1007/bf00029877

Euphytica

1993

DOI: 10.1007/bf00029877

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Inheritance and genetic diversity of some enzymes in the sexual and diploid pool of the agamic complex of Maximae (Panicum maximum Jacq., P. infestum Anders. and P. trichocladum K.Schum.)

B. Assienan¹,

Michel Noirot

Y. M. Gnagne³

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Cited by 5 publications

References 18 publications

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Isozyme polymorphism and organization of the agamic complex of the Maximae (Panicum maximum Jacq., P. infestum Anders, and P. trichocladum K. Schum.) in Tanzania

Assienan¹,

Noirot

1995

Theoret. Appl. Genetics

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The tribe Maximae (Panicum maximum Jacq., P. infestum Anders., P. trichocladum K. Schum.) includes two sympatric pools with different modes of reproduction and ploidy levels: an apomictic and tetraploid pool on the one hand, and a smaller, sexual and diploid pool on the other. From an analysis of isozyme polymorphism five main results were evident. First, overall polymorphism is considerable showing that apomixis does not lead to a reduction in diversity. Second, the isozyme polymorphism of the two pools is similar, and this may be explained by reciprocal gene flow (low, but continuous) between these two pools. Third, maximum local polymorphism is due to the simultaneous presence of P. maximum sexuals and P. infestum apomicts. A continuum exists between the two species. Fourth, a high proportion of rare alleles, arising from introgression from P. infestum, characterized the isozyme polymorphism. These rare alleles, strongly counter-selected at the diploid level, are maintained by apomixis; the frequency of triplex or quadruplex genotypes was nevertheless low. Fifth, the heterozygosity level within apomicts is not higher than that of sexuals, showing that the apomixis-polyploidy combination does not lead to a higher frequency of very heterozygous individuals.

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Isozyme polymorphism and organization of the agamic complex of the Maximae (Panicum maximum Jacq., P. infestum Anders, and P. trichocladum K. Schum.) in Tanzania

Assienan¹,

Noirot

1995

Theoret. Appl. Genetics

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Isozyme Banding Pattern and Estimation of Genetic Diversity among Guinea Grass Germplasm

Jain

Roy

Kaushal

et al. 2006

Genet Resour Crop Evol

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Isozyme banding pattern was studied in Guinea grass (Panicum maximum Jacq.), a widely cultivated grass having good fodder value. Similarity among 63 accessions collected from diverse sources was worked out using five enzyme systems (SOD, GOT, ACP, Esterase and Peroxidase) following horizontal starch gel electrophoresis. Biochemical markers such as isozymes are useful supplements in identifying the genetic variation present in any crop. A total of 35 clear and unambiguous bands were used for analysis of which 8 bands were monomorphic. Polymorphism exhibited by 27 bands from all five enzyme systems indicate presence of considerable diversity in this species. The dendrogram generated after UPGMA and SAHN cluster analysis using Jaccard genetic distance showed that 63 accessions from diverse geographical locations could be grouped in three main clusters, of which two could further be divided into sub-clusters. Although the clusters comprised members from different locations, most of the accessions from similar geographical locations tended to cluster in same group.

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Characterization of rice cropping practices and multiple pest systems in the Philippines

Savary

Elazegui

Moody

et al. 1994

Agricultural Systems

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Inheritance and genetic diversity of some enzymes in the sexual and diploid pool of the agamic complex of Maximae (Panicum maximum Jacq., P. infestum Anders. and P. trichocladum K.Schum.)

Cited by 5 publications

References 18 publications

Isozyme polymorphism and organization of the agamic complex of the Maximae (Panicum maximum Jacq., P. infestum Anders, and P. trichocladum K. Schum.) in Tanzania

Isozyme polymorphism and organization of the agamic complex of the Maximae (Panicum maximum Jacq., P. infestum Anders, and P. trichocladum K. Schum.) in Tanzania

Isozyme Banding Pattern and Estimation of Genetic Diversity among Guinea Grass Germplasm

Characterization of rice cropping practices and multiple pest systems in the Philippines

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