Desempenho produtivo, partenocarpia e expressão sexual de linhagens de pepino caipira em ambiente protegido

Abstract

Yield, parthenocarpy and sexual expression of 'caipira' cucumber lines under protected cultivationThe yield capacity, parthenocarpy and sexual expression of 'caipira' cucumber lines were evaluated under protected cultivation. Yield capacity was evaluated in an experiment in randomized blocks design with 18 treatments (16 lines and two 'caipira' hybrids, Safira and Guarani), four replicates and five plants per plot, in a greenhouse with opened laterals to permit the entrance of pollinators. Sexual expression and parthenocarpy were evaluated in similar design, with 16 lines of SHS population (F 2 BC 1 from the crossing between hybrids Safira and Hatem-beith alpha type) and 19 of GH population (F 2 from the crossing between hybrids Guarani and Hatem), but this experiment was set up in closed greenhouse, with anti-aphid net, avoiding the entrance of pollinators. Parthenocarpy was evaluated verifying fruit set in each line. Many lines were statistically similar to hybrids in yield capacity, but none was superior. Hybrids Safira and Guarani yielded 23.1 and 19.1 fruits plant -1 , and 21.9 and 17.5 commercial fruits, respectively. Total and commercial weights plant -1 were respectively 3.8 and 3.6 kg for hybrid Safira and 2.9 and 2.7 kg for hybrid Guarani. Line SHS-2 presented good yield, similar to both hybrids, with light 'caipira' fruit type, besides parthenocarpy and gynoecious plants. All lines from population SHS have 'caipira' fruit type, but only five were parthenocarpic. In population GH, nine lines were parthenocarpic and ten have 'caipira' fruit type. Two lines from population SHS have only monoecious plants, with the others segregating to gynoecious and monoecious plants. In population GH, all plants were gynoecious. SHS population is more interesting to obtain lines because the 'caipira' fruit type is more similar to commercial fruits.

Tipos de poda em pepino dos grupos aodai, japonês e caipira

“…O espaçamento normalmente usado na cultura do pepino, em sistema tutorado a campo é de 1,0 m entre fileiras e 0,5 m entre plantas (Cardoso, 2002;Cardoso & Silva, 2003;Godoy et al, 2009). Assim, as maiores produtividades obtidas no presente trabalho podem ter sido decorrentes do menor espaçamento utilizado (0,75x0,5 m), que possibilitou produtividade superior à obtida pelos produtores, que utilizam nível tecnoló-gico similar ao deste trabalho.…”

Implementação E Validação De Método Analítico Para a Determinação De Resíduos De Agrotóxicos Em Alimentos Provenientes Do Estado Do Rio De Janeiro Por Cromatografia Gasosa Acoplada À Espectrometria De Massas Tandem

“…O pepino (Figura 13) tem grande importância na comercialização de hortaliças, sendo muito consumido em todo o Brasil (Godoy et al, 2009) e está entre as culturas abrangidas pelo programa do governo brasileiro que monitora a qualidade dos alimentos no mercado varejista quanto à presença de resíduos de agrotóxicos e afins (Neto e Gonçalves, 2016). Figura 14: Amostra de tomate…”