Homoeologous chromosome pairing between the A and B genomes of Musa spp. revealed by genomic in situ hybridization.
Ann Bot
; 108(5): 975-81, 2011 Oct.
Article
en En
| MEDLINE
| ID: mdl-21835815
ABSTRACT
BACKGROUND AND AIMS:
Most cooking banana and several desert bananas are interspecific triploid hybrids between Musa acuminata (A genome) and Musa balbisiana (B genome). In addition, M. balbisiana has agronomical characteristics such as resistance to biotic and abiotic stresses that could be useful to improve monospecific acuminata cultivars. To develop efficient breeding strategies for improving Musa cultivars, it is therefore important to understand the possibility of chromosome exchange between these two species.METHODS:
A protocol was developed to prepare chromosome at meiosis metaphase I suitable for genomic in situ hybridization. A series of technical challenges were encountered, the main ones being the hardness of the cell wall and the density of the microsporocyte's cytoplasm, which hampers accessibility of the probes to the chromosomes. Key parameters in solving these problems were addition of macerozyme in the enzyme mix, the duration of digestion and temperature during the spreading phase. RESULTS ANDCONCLUSIONS:
This method was applied to analyse chromosome pairing in metaphase from triploid interspecific cultivars, and it was clearly demonstrated that interspecific recombinations between M. acuminata and M. balbisiana chromosomes do occur and may be frequent in triploid hybrids. These results provide new insight into Musa cultivar evolution and have important implications for breeding.
Texto completo:
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Bases de datos:
MEDLINE
Asunto principal:
Musa
/
Emparejamiento Cromosómico
/
Cromosomas de las Plantas
Idioma:
En
Revista:
Ann Bot
Año:
2011
Tipo del documento:
Article
País de afiliación:
Francia