Abstract
To investigate the effect of temperature on the resistance characteristics of rice varieties with different resistance genes to brown planthopper (BPH), Nilaparvata lugens (St˚l), the resistances of IR26 ( Bph1) and IR36 ( bph2) to BPH population in Hangzhou, China were monitored in greenhouse during September in 2007 and 2008 by using the standard seedling screening techniques (SSST) developed by the International Rice Research Institute (IRRI). Furthermore, the changes in resistance of IR26 and IR36 to BPH, soluble sugar and oxalic acid contents in 25-day-old rice plants of susceptible variety TN1 and resistant varieties IR26 and IR36 were detected at five temperatures (22°C, 25°C, 28°C, 31°C and 34°C). IR26 completely lost resistance both in greenhouse and at the five tested temperatures. IR36 still had moderate resistance at natural temperature, but its resistance decreased gradually when the temperature increased from 25°C to 34°C, and fully lost its resistance at 31°C and 34°C. The highest durable resistance of IR26 and IR36 were recorded at 25°C. The soluble sugar content in plants of the three tested rice varieties increased with temperature increase, and the oxalic acid content increased with the temperature increase at first, maximized at 25°C, and then declined. Two-way ANOVA indicated significant effects of temperature and rice variety on contents of soluble sugar and oxalic acid in rice plants.
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