Gene introgression for imidazolinone group chemical herbicide tolerance

de Magalhães da Fonseca, Gabriela and Nardino, Maicon and da Luz, Viviane Kopp and de Oliveira, Victoria Freitas and de Magalhães da Fonseca, Marina and de Magalhães Bandeira, Juliana and de Magalhães Júnior, Ariano Martins and da Maia, Luciano Carlos and de Oliveira, Antonio Costa (2021) Gene introgression for imidazolinone group chemical herbicide tolerance. CEREAL RESEARCH COMMUNICATIONS, 49 (3). pp. 457-463. ISSN 0133-3720 (print), 1788-9170 (online)

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Abstract

Genes of tolerance for herbicide has become one of the options more used in world level for the weed control. This study had as objective to evaluated crosses between tolerant irrigated rice plants and sensitive to herbicides of the imidazolinone chemical group, through the evaluation of F2 populations. Five genotypes of irrigated rice were crossed. Three of these parents are sensitive to the herbicide: BRS Querência, BRS Fronteira and BRS Pampa and two genotypes, BRS Sinuelo CL and Puitá INTA CL, tolerant to the herbicide. F1 seeds were obtained in greenhouse, and generation advance was performed in Embrapa Rice and Beans, resulting in the F2 population. F2 plants in the stage V4 received herbicide applications of (Only®) at a dose of 75 and 25 g a.i. L−1, and Dash® in dose of 0.5% v/v. A second application was performed after one week. The degree of phytotoxicity was scored as dead leaves and phytotoxicity intensity, percent survival of leaves and the relative growth. The results showed that the F2 hybrids, resulting of the crosses between the cultivars carriers of the gene of herbicide tolerance of the imidazolinone (Only®) class and conventional irrigated rice cultivars, are viable, thus enabling the establishment of herbicide-tolerant irrigated rice populations, with greater capacity to fight the red rice and with characteristics of agronomic interest. F2 progenies descending from crosses with the cultivar Puitá INTA CL presented more tolerance when compared with progenies descending from crosses with the cultivar BRS Sinuelo CL.

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