Data/hora: 06/06/2024 08:21:32

Biblioteca(s): 	Embrapa Arroz e Feijão.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Circulação/Nível: 	B - 5	
Data corrente: 	19/12/2017	
Data da última atualização: 	26/12/2017	
Autoria: 	TALLEBOIS, J.; DOSMANN, J.; CRONEMBERGER, H.; PAREDES, H.; CAO, T. V.; NEVES, P.; AHMADI, N.	
Afiliação: 	JAMES TALLEBOIS, CIRAD; JOANNA DOSMANN, EL ACEITUNO, Colombia; HELMA CRONEMBERGER, UFG; HERMINIO PAREDES, UNIVERSIDADE DE PALMIRAS, Colombia; TUONG-VI CAO, CIRAD; PERICLES DE CARVALHO FERREIRA NEVES, CNPAF; NOUROLLAH AHMADI, CIRAD.	
Título: 	Breeding for outcrossing ability in rice, to enhance seed production for hybrid rice cropping.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	Rice Research, v. 5, n. 3, 2017.	
ISSN: 	2375-4338	
DOI: 	10.4172/2375-4338.1000184	
Idioma: 	Inglês	
Conteúdo: 	Background: Adoption of the hybrid rice varieties by farmers is often impaired by the high price of hybrid seed, due to low yields in hybrid seed production fields. Female outcrossing ability (FOA) and female hybrid seed production ability (FHSPA), defined as the rate of filled spikelets of the male sterile (MS) line and as its grain yield under outcrossing, respectively, determine plant traits for hybrid seed yield. Breeding for FOA and FHSPA in rice has suffered from the lack of a high throughput phenotyping method and the inbred breeding approach used for the development of MS lines. We developed an innovative hybrid rice breeding strategy that uses the monogenic recessive male-sterility gene ms-IR36 for the reciprocal recurrent improvement of maintainer and restorer populations. Results: High throughput screening for FOA and FHSPA can be achieved by scoring the grain weight of MS plants and the grain yield of fertile plants of progenies extracted from breeding populations segregating for the ms-IR36 gene. Using this phenotyping method in seven field trials, each involving several hundred entries, we revealed a very broad diversity for FOA (ranging from zero to 89%) and FHSPA, within the F3 progenies of bi-parental crosses and within S1 and S2 progenies extracted from different breeding populations. The seven experiments produced convergent results and heritabilities of 0.59-0.90 for FHSPA and 0.45-0.72 for FOA. Correlations between FHSPA and FOA were tight and highly significant. Correlations were looser between FHSPA and grain yield of the selfed fertile sibling (GW-MF). Correlations between FOA and GW-MF were not significant. Tight significant correlation was also observed between FHSPA of S1 lines and S2 lines extracted from the former. Conclusion: Population breeding through recurrent selection, using the ms-IR36 gene as a tool for both recombination and seed production for testcrossing, is a favorable framework for harnessing rice genetic diversity for FHSPA. Rapid and cost-effective genetic gain for hybrid seed production can be achieved using results of the ms-IR36 gene mediated test cross seed production process as FHSPA early screening.	
Palavras-Chave: 	Hibrids; Hybrid variety.	
Thesagro: 	Arroz; Híbrido; Melhoramento genético vegetal; Oryza sativa; Produção de sementes.	
Thesaurus Nal: 	Cultivars; Outcrossing; Plant breeding; Rice; Seed productivity.	
Categoria do assunto: 	G Melhoramento Genético	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/169282/1/CNPAF-2017-rr.pdf	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CNPAF - (34982-1) - UPC - AP - DD - 2017 -  - 2017 - DIS