Abstract:

Effect of transgenic sck+cry1Ac rice (MSB) on mortality and fresh weight of the stripped stem borer (SSB), Chilo suppressalis (Walker), and biological characteristics of Apanteles chilonis (Munakata) via its host SSB was studied in the laboratory. Mortalities of SSB feeding on MSB increased steadily, and were significantly higher than those feeding on MH86 (CK) on day 6 and afterwards. The fresh weights of SSB continuously feeding on MSB were significantly less than those of feeding on CK on day 2 and afterwards. Mortalities of SSB feeding on CK for 3, 6, 9, 12 days after feeding on MSB for 36 h were not significantly different from those of continuously feeding on CK; but the fresh weights of the SSB were very significantly less than those feeding on CK on day 3 Parasitism rate of 4th instar larva feeding on MSB by A. chilonis was significantly lower than that of the control. Pupal duration and length of cocoon of the parasitoid from the 5th instar larva feeding on MSB were significantly longer and shorter than those of the control, respectively. However, no differences were detected in percentage of pupa formation, duration of egg and larva, cocoon number of simple cocoon mass, wasp emergence rate, female rate, longevity and forewing length of wasp between the parasitoids from SSB feeding on MSB and MH86. The results indicated that the transgenic sck+cry1Ac rice did affect not only the mortality and body weight of the stripped stem borer, but also some biological characteristics of its parasitoid A. chilonis.

Key words: Transgenic sck+cry1Ac rice, Chilo suppressalis, Apanteles chilonis, survival, growth and development