CITOLOGIA y METODO DE REPRODUCCION EN DOS ESPECIES DE PASPALUM (GRAMINEAE)

GUILLERMO A. NORRMANN

doi:10.30972/bon.514-208210

Autores/as

GUILLERMO A. NORRMANN Instituto de Botánica del Nordeste. CONICET-UNNE

DOI:

https://doi.org/10.30972/bon.514-208210

Resumen

Microsporogenesis, megasporogenesis, embryo sac development, and fertility were studied in P. regneUii Mez and P.. hydrophilum Henr. The chromosome number of P. regnellii (2n = 40) is reported for the first time. Bivalent chromosome pairing suggests alJotetraploid origin for this species with RRSS genome formula. There is no homology between R and S genomes. Cytological data suggest that P. hydrophilu_m (~n = 40) has a H H H' H' genOJlle formula with segmental.homology h,etween H and H'·genomes. Observations on megasporogenesis and embryo sac development indicate that P. regnellii reproduces sexually and P. hydrophilum by means of facultative apomixis.

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