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Abstract
The life cycle of the rice root-knot nematode, Meloidogyne graminicola, was studied in an indoor growth chamber on the susceptible Asian rice cultivar UPLRi-5 at 29/26 and 36/32 °C (day/night temperature) under non-flooded and flooded conditions. Adult females were observed 11 days after inoculation (DAI) at 36/32 °C under non-flooded conditions and at 29/26 °C under flooded conditions. At 29/26 °C under non-flooded conditions, adult females were observed at 13 DAI. Completion of the life cycle from the second-stage juvenile (J2) to the second-generation J2 at 29/26 °C under non-flooded conditions was 20 days, and 19 days at 29/26 and 36/32 °C under flooded and non-flooded conditions, respectively. At 36/32 °C under non-flooded conditions, about one-third more adult females were observed compared with the other treatments but this did not result in more second-generation J2. The number of second-generation J2 was significantly higher (more than 15 times) at 29/26 °C under flooded conditions compared with the other treatments. At 25 DAI (i.e. after the second-generation J2 had been generated), a significant 3.5 fold increase in the number of galls per root system was observed on the plants grown at 29/26 °C under non-flooded conditions compared with the other treatments.
Acknowledgements
The authors would like to thank Sergio Velasco and Juan Reyes for their technical assistance. This research was supported by the International Rice Research Institute (IRRI).