title: Comparative study of the floral biology and of the response of productivity to insect visitation in two rapeseed cultivars (Brassica napus L.) in Rio Grande do Sul.
abstract: Planning the artificial pollination of agricultural crops requires knowledge of the floral biology and reproductive system of the crop in question. Many studies have shown that rapeseed (Brassica napus Linnaeus) is self-compatible and self-pollinated, but its productivity may be increased by insect visitation. In the present study, the floral biology and the response of productivity to insect visitation of two rapeseed cultivars (Hyola 420 and Hyola 61) were analyzed and compared in three regions of Rio Grande do Sul, Brazil. The rapeseed flowers presented three stages during anthesis, with the time periods varying between the cultivars. Both cultivars are self-compatible, but free visitation of insects increased productivity by 17% in the Hyola 420 cultivar and by approximately 30% in the Hyola 61 cultivar. Therefore, it is concluded that the cultivar Hyola 61 is more dependent on insect pollination than Hyola 420.
authors: Programa de Pós-Graduação em Zoologia, Departamento de Biodiversidade e Ecologia, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul - PUCRS, Porto Alegre, RS, Brazil.
authors: B
authors: B
authors: Blochtein
authors: Programa de Pós-Graduação em Zoologia, Departamento de Biodiversidade e Ecologia, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul - PUCRS, Porto Alegre, RS, Brazil.
authors: P
authors: P
authors: Nunes-Silva
authors: Programa de Pós-Graduação em Zoologia, Departamento de Biodiversidade e Ecologia, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul - PUCRS, Porto Alegre, RS, Brazil.
authors: R
authors: R
authors: Halinski
authors: Grupo de pesquisa Educação em Ciências e Matemática para o Desenvolvimento Sustentável, Programa de Pós Graduação em Ensino de Ciências e Matemática, Universidade Luterana do Brasil - ULBRA, Canoas, RS, Brazil.
authors: L A
authors: LA
authors: Lopes
authors: Fundação Zoobotânica do Rio Grande do Sul, Museu de Ciências Naturais, Setor Manejo de Fauna, Porto Alegre, RS, Brazil.
authors: S
authors: S
authors: Witter
mesh_terms: D000818:Animals; D029688:Brassica napus / Q000254:growth & development* / Q000469:parasitology*; D001938:Brazil; D035264:Flowers / Q000254:growth & development*; D007313:Insecta / Q000145:classification / Q000502:physiology*; D054817:Pollination / Q000502:physiology*; D013997:Time Factors