SciELO - Scientific Electronic Library Online

 
vol.2 número3BIOLOGICAL WARFARE, BIOTERRORISM, BIODEFENCE AND THE BIOLOGICAL AND TOXIN WEAPONS CONVENTIONVisualization and Functional Analysis of a Maxi-K Channel (mSlo) Fused to Green Fluorescent Protein (GFP) índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Electronic Journal of Biotechnology

versión On-line ISSN 0717-3458

Resumen

VNTR-based diversity analysis of 2x and 4x full-sib Musa hybrids. Electron. J. Biotechnol. [online]. 1999, vol.2, n.3, pp. 1-2. ISSN 0717-3458.

The triploid plantain landrace Obino l’Ewai (Musa spp., AAB genome) has been crossed with a wild diploid banana (M. acuminata subsp. burmannica var. ‘Calcutta 4’, AA genome) to generate full-sib diploid and tetraploid hybrids combining good agronomic performance and disease resistance. Microsatellite marker analysis of the parental genotypes confirmed the highly heterozygous nature of both parental genotypes. Comparative analysis of 2x and 4x full-sib hybrids with their parental genotypes indicated that tetraploid hybrids are generally more closely related to Obino l’Ewai than their diploid full-sibs. Based on VNTR analysis it is possible to identify those hybrids, which may be most useful in subsequent breeding of secondary triploid hybrids. There was a significant (P<0.05) negative association between the VNTR-based genetic similarity of hybrids to Obino l’Ewai and a phenotypic distance index based on eight agronomic descriptors. However, there was no association between the molecular genetic similarity of hybrids to Calcutta 4 and the respective phenotypic distance index. Many microsatellite markers generated an unexpectedly high number of amplification products from AA and AAB genotypes plus their progeny which may suggest the presence of a high frequency of loci duplication in both A and B genomes, in addition to the detection of heterozygous and/or homoeologous loci.

Palabras llave : .

        · texto en Inglés     · pdf en Inglés