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Registro Completo |
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Biblioteca(s): |
Embrapa Agricultura Digital. |
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Data corrente: |
19/04/2010 |
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Data da última atualização: |
19/10/2010 |
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Autoria: |
SIMIONI, C.; VALLE, C. B. do. |
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Afiliação: |
CARINE SIMIONI, UFRGS; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
Chromosome duplication in Brachiaria (A. Rich.) Stapf allows intraspecific crosses. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Crop Breeding and Applied Biotechnology, Londrina, v. 9, n. 4, p. 328-334, Dec. 2009. |
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Idioma: |
Inglês |
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Conteúdo: |
Brachiaria decumbens cv. Basilisk is the single most important forage grass used for pastures in the tropics. Breeding to produce improved cultivars has been impossible until now due to the lack of compatible sexual ecotypes. This paper reports the success of somatic chromosome duplication of sexually reproducing diploid plants of B. decumbens and of a diploid hybrid between B. decumbens and B. brizantha, which should allow intraspecific crosses with natural apomictic tetraploid accessions of either species. Polyploidization was induced in explants cultured in vitro on a medium supplemented with colchicine at 0.01% for 48 hours, transferred to the same medium without colchicine until shoot regeneration occurred. Five sexual tetraploid plants (3.9% of plants recovered) were obtained. Crosses with apomictic cultivars recovered 14 seeds. The novel sexual tetraploids generated were unique and represented a major breakthrough in breeding B. decumbens to obtain superior hybrids. |
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Palavras-Chave: |
Autopoliplóides; Chromosome duplication; Cruzamentos intraespecíficos; Duplicação cromossômica; Intraspecific crosses; Melhoramento genético. |
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Thesagro: |
Brachiaria. |
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Thesaurus Nal: |
Autopolyploidy; Plant breeding. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 01736naa a2200241 a 4500
001 1696969
005 2010-10-19
008 2009 bl uuuu u00u1 u #d
100 1 $aSIMIONI, C.
245 $aChromosome duplication in Brachiaria (A. Rich.) Stapf allows intraspecific crosses.
260 $c2009
520 $aBrachiaria decumbens cv. Basilisk is the single most important forage grass used for pastures in the tropics. Breeding to produce improved cultivars has been impossible until now due to the lack of compatible sexual ecotypes. This paper reports the success of somatic chromosome duplication of sexually reproducing diploid plants of B. decumbens and of a diploid hybrid between B. decumbens and B. brizantha, which should allow intraspecific crosses with natural apomictic tetraploid accessions of either species. Polyploidization was induced in explants cultured in vitro on a medium supplemented with colchicine at 0.01% for 48 hours, transferred to the same medium without colchicine until shoot regeneration occurred. Five sexual tetraploid plants (3.9% of plants recovered) were obtained. Crosses with apomictic cultivars recovered 14 seeds. The novel sexual tetraploids generated were unique and represented a major breakthrough in breeding B. decumbens to obtain superior hybrids.
650 $aAutopolyploidy
650 $aPlant breeding
650 $aBrachiaria
653 $aAutopoliplóides
653 $aChromosome duplication
653 $aCruzamentos intraespecíficos
653 $aDuplicação cromossômica
653 $aIntraspecific crosses
653 $aMelhoramento genético
700 1 $aVALLE, C. B. do
773 $tCrop Breeding and Applied Biotechnology, Londrina$gv. 9, n. 4, p. 328-334, Dec. 2009.
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Embrapa Agricultura Digital (CNPTIA) |
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