Abstract
We investigated the mechanism of brown planthopper, Nilaparvata lugens (Sta°l), resistance in the popular rice
cultivar IR64, and the current level of resistance of IR64 to N. lugens in a large rice growing area with low brown
planthopper populations (Central Luzon, Philippines). In greenhouse experiments with N. lugens populations
collected from Central Luzon, IR64 showed slight to moderate levels of antibiosis, antixenosis, and tolerance
relative to the cultivars IR22 and Azucena, which contain no major genes for N. lugens resistance. IR64 was also
more resistant than IR26 in most experiments, despite the fact that both varieties have the same major gene for
N. lugens resistance, Bph1. This confirms that IR64 contains one or more additional, apparently minor, genes for
brown planthopper resistance. Our findings also demonstrate that, in an area with low insecticide use, it is not
necessary to have high levels of N. lugens resistance, even in a rice cultivar grown by the majority of farmers, to
maintain low and stable N. lugens populations.
AbstractWe investigated the mechanism of brown planthopper, Nilaparvata lugens (Sta°l), resistance in the popular ricecultivar IR64, and the current level of resistance of IR64 to N. lugens in a large rice growing area with low brownplanthopper populations (Central Luzon, Philippines). In greenhouse experiments with N. lugens populationscollected from Central Luzon, IR64 showed slight to moderate levels of antibiosis, antixenosis, and tolerancerelative to the cultivars IR22 and Azucena, which contain no major genes for N. lugens resistance. IR64 was alsomore resistant than IR26 in most experiments, despite the fact that both varieties have the same major gene forN. lugens resistance, Bph1. This confirms that IR64 contains one or more additional, apparently minor, genes forbrown planthopper resistance. Our findings also demonstrate that, in an area with low insecticide use, it is notnecessary to have high levels of N. lugens resistance, even in a rice cultivar grown by the majority of farmers, tomaintain low and stable N. lugens populations.
การแปล กรุณารอสักครู่..