Genetic studies on resistance to brown planthopper in some rice varieties, in which reslstance genes had been found but not identifled, were conducted. Allelism tests revealed that resistance of 'Col. 5 Thailand', 'Col. 11 Thailand' and 'Chin saba' was governed by a recessive gene that was designated bph 8(t), and that resistance of 'Balamawee', 'Kaharamana' and 'Pokkali' was governed by a dominant gene that was designated Bph 9(t).
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Nemoto et al. (1989) studied this question.
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