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.

对除草剂的耐受性基因已成为世界范围内用于控制杂草的选择之一。这项研究的目的是通过评估F ₂种群来评估耐旱灌溉水稻植物与对咪唑啉酮化学类除草剂敏感的杂交。杂交了五种灌溉水稻的基因型。这些亲本中的三个对除草剂敏感：BRSQuerência，BRS Fronteira和BRS Pampa，以及两个基因型，BRS Sinuelo CL和PuitáINTA CL耐受除草剂。在温室中获得了F ₁种子，并在Embrapa稻米和豆类中进行了产生，从而产生了F ₂种群。F ₂在阶段V4植物接收的（只有除草剂应用^®剂量为75）和25克有效成分大号^-1，和短跑^®在0.5％V / V的剂量。一个星期后进行了第二次申请。将植物毒性程度记为枯叶和植物毒性强度，叶片存活率和相对生长。结果表明，F ₂杂种是由咪唑啉酮抗除草剂耐受性基因的栽培品种携带者之间的杂交产生的（^Only®）级和常规灌溉稻品种是可行的，因此能够建立耐除草剂的灌溉稻群体，具有更大的抗红稻能力并具有农艺学特征。与品种BRS Sinuelo CL杂交的后代相比，与PuitáINTA CL杂交后代的F _2后代表现出更大的耐受性。