Data/hora: 12/06/2024 21:31:17

Biblioteca(s): | Embrapa Agroindústria Tropical.
Data corrente: | 15/04/2008
Data da última atualização: | 07/11/2017
Autoria: | CAVALCANTI, J. J. V.
Título: | Genetic mapping and QTL identification in cashew (Anacardium occidentale L.).
Ano de publicação: | 2004
Fonte/Imprenta: | 2004. 178 f.
Idioma: | Inglês
Notas: | Tese (Doutorado em Melhoramento genético) - The University of Reading, Whiteknights.

Conteúdo:

Cashew (Anacardium occidentale L.) breeding programme has focussed on
the selection and vegetative propagation of superior hybrids to generate elite
clones with improved productivity, quality, disease resistance and physiology.
The application of molecular markers for selection has the potential to greatly
accelerate the breeding processo In this study, two linkage genetic maps were
constructed using 194 AFLP and 11 SSR markers and a F1 mapping
population of 85 individuais originated from a cross between CP 1001 (dwarf
commercial clone) and CP 96 (giant genotype). The female map (CP 1001)
contains 122 markers over 19 linkage groups and the male map (CP 96)
comprises 120 markers assembled over 23 linkage groups. The total map
distance of the female map is 1050.6 cM, whereas the male map spans 944.7
cM. The average map distance between markers is 8.6 cM in the female map
and 7.9 cM in the male map. QTL analysis was performed on the progeny
using these maps and yielded three QTLs with economic potential. These
included one for plant height, one for canopy diameter and one for black mould
resistance. These QTLs explained 22.8% of variation in height, 9.6% of
canopy variance and 21.8% of phenotypic resistance to black mould. In
addition, three putative QTLs for plant height, two for canopy diameter and two
for black mould severity were also identified. These results provide the
groundwork for future marker-assisted selection in cashew and will have
particular value in allowing early selection for desired phenotypes. Thus, the
breeding progress will be accelerated, with enhanced possibility of significant
genetic gain, reduction of experimental area and therefore of cost and time.

Palavras-Chave: | Genetic mapping construction; Molecular markers identification.
Categoria do assunto: | --
Registro original: | Embrapa Agroindústria Tropical (CNPAT)
Exemplares: | CNPAT - (10394-1) - UPA - TS - PP - 2004.00017 -  - 2004.00017 - DIS