CONTROL OF Bipolaris oryzae (Breda de Haan) USING Curcuma longa (Linnaeus) EXTRACT AND EFFECT OF THIS EXTRACT ON RICE SEED PHYSIOLOGY

Authors

  • Keilor da Rosa Dorneles Crop Protection Department, Universidade Federal de Pelotas, Faculty of Agronomy Eliseu Maciel, Pelotas, RS
  • Paulo Cesar Pazdiora Crop Protection Department, Universidade Federal de Pelotas, Faculty of Agronomy Eliseu Maciel, Pelotas, RS
  • Fábio Júnior Araújo Silva Department of Phytopathology, Universidade Federal Rural de Pernambuco, Recife, PE
  • Renata Moccellin Crop Protection Department, Universidade Federal de Pelotas, Faculty of Agronomy Eliseu Maciel, Pelotas, RS
  • Cândida Renata Jacobsen Farias Crop Protection Department, Universidade Federal de Pelotas, Faculty of Agronomy Eliseu Maciel, Pelotas, RS

DOI:

https://doi.org/10.1590/1983-21252018v31n112rc

Keywords:

Curcuma. Alternative control. Brown spot.

Abstract

This study was conducted to evaluate the use of Curcuma longa (Linnaeus) extract in the in vitro control of Bipolaris oryzae (Breda de Haan) and to characterize the effect of this extract on rice seed germination. A completely randomized arranged in a factorial experimental design was used: three isolates of B. oryzae from rice seed from different rice-growing regions of Rio Grande do Sul (Fronteira Oeste, Campanha, and Sul) were tested with three concentrations (20, 40, and 80 mg/mL) of C. longa plus a control treatment (0 mg/mL). Each reaction was repeated in quadruplicate. The effect of the extract upon the disease development was evaluated based on mycelial growth (PMG) and spore production; rice seed germination was evaluated using a germination test (Germitest®). The PMG results demonstrate that the treatments were effective in reducing PMG, with a stronger response observed as the concentration of the extract increased. An average inhibition of 84% of sporulation was observed for the tested strains compared with the control treatment. There were, however, no significant differences in terms of seed germination test with the different C. longa concentrations. Therefore, treatment of rice seeds with C. longa extract does not affect seed germination but positively inhibits mycelial growth and sporulation, affecting the in vitro sporulation of the different isolates of B. oryzae.

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Published

11-12-2017

Issue

Section

Agronomy