Cytology and reproductive behavior of diploid, tetraploid and hexaploid germplasm accessions of a wild forage grass: Paspalum compressifolium

Fourteen germplasm accessions of Paspalum compressifolium native from southern Brazil were cytologically and embryologically analysed. The study revealed that one accession was diploid (2n = 20), twelve were tetraploid (2n = 40) and one was hexaploid (2n = 60). This is the first report of diploid an...

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Bibliographic Details
Published in:Euphytica 1996, Vol.90 (3), p.345-349
Main Authors: Quarin, C.L. (Instituto de Botanica del Nordeste, Corrientes (Argentina)), Pozzobon, M.T, Valls, J.F.M
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
AUTOESTERILIDAD
AUTOSTERILITE
Biological and medical sciences
BRASIL
BRAZIL
BRESIL
CITOLOGIA
Cytogenetics
CYTOLOGIE
CYTOLOGY
EMBRIONES VEGETALES
EMBRYON VEGETAL
Fundamental and applied biological sciences. Psychology
Generalities. Genetics. Plant material
Genetic resources, diversity
Genetics and breeding of economic plants
GERMOPLASMA
GERMPLASM
Heterosis. Floral biology applications: apomixy, male sterility, incompatibility, varia
PASPALUM
Plant breeding: fundamental aspects and methodology
PLANT EMBRYOS
Plant material
POLIPLOIDIA
POLYPLOIDIE
POLYPLOIDY
SELF STERILITY
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Summary:Fourteen germplasm accessions of Paspalum compressifolium native from southern Brazil were cytologically and embryologically analysed. The study revealed that one accession was diploid (2n = 20), twelve were tetraploid (2n = 40) and one was hexaploid (2n = 60). This is the first report of diploid and hexaploid cytotypes for this species. Studies on microsporogenesis, megasporogenesis, and embryo sac development indicated that the diploid cytotype had regular meiotic behavior and reproduces sexually. Tetraploid cytotype usually had an important proportion of chromosomes that associated as quadrivalents during meiosis and reproduced by mean of aposporous apomixis. The hexaploid cytotype showed irregular meiotic behavior with about one third of the chromosomes associated as multivalents and reproduced by aposporous apomixis. Thus, P. compressifolium could be an agamic complex. Breeding in this complex is possible due to the presence of diploid sexuals which can be treated by colchicine and pollinated by apomicts.
ISSN:0014-2336
1573-5060
DOI:10.1007/bf00027486