Development of herbicide-tolerant irrigated rice cultivars

The objective of this work was to develop new irrigated rice lines tolerant to imidazolinone herbicides. The backcross breeding procedure was used to transfer the imidazolinone tolerance allele from mutant 93AS3510 to the recurrent parents 'BRS 7 Taim' and 'BRS Pelota'. Individual herbicide-tolerant plants were selected in each generation, for three backcrossings (RC1 to RC3), followed by three selfing generations (RC3F1 to RC3F3). The best four RC3F3 lines for agronomic traits were genotyped with 44 microsatellite markers. The observed conversion index of the new imidazolinone-tolerant lines varied from 91.86 to 97.67%. Pairwise genetic distance analysis between these lines and 22 accessions from the Embrapa's Rice Germplasm Bank clustered the new lines with their respective recurrent parents, but not with 'IRGA 417', which was originally used as recurrent parent to derive IRGA 422 CL, the only imidazolinone-tolerant irrigated rice cultivar recommended for cultivation in Brazil. Therefore, these lines represent new options of genetically diverse imidazolinone-tolerant rice accessions. Lines CNA10756 ('BRS Sinuelo CL') and CNA10757 will be released for cultivation in the Clearfield irrigated rice production system in Rio Grande do Sul, Brazil.

Bibliographic Details

Main Authors:	Rangel,Paulo Hideo Nakano, Moura Neto,Francisco Pereira, Fagundes,Paulo Ricardo Reis, Magalhães Junior,Ariano Martins de, Morais,Orlando Peixoto de, Schmidt,Andréa Branco, Mendonça,João Antônio, Santiago,Carlos Martins, Rangel,Priscila Nascimento, Cutrim,Veridiano dos Anjos, Ferreira,Márcio Elias
Format:	Digital revista
Language:	English
Published:	Embrapa Secretaria de Pesquisa e Desenvolvimento 2010
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000700010
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