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Sources and Inheritance of Resistance to Brown Planthopper in Some Breeding Lines of Rice¹

The inheritance of resistance to the brown planthopper (Nilaparvata lugens Sial.) in three breeding lines of rice (Oryza sativa L.), IR747B2-6, IR1154-243, and IR4-93, was studied. Seven-day-old seedlings were infested with second- and third-instar nymphs of brown planthopper and seedling injury was recorded 7 to 8 days after infestation.

The resistance of IR747B2-6 was conditioned by a single dominant gene which was allelic to the dominant gene of the variety ‘Mudgo’ (Bph 1). The resistance of IR1154-243 and of IR4-93 was governed by the same recessive gene which was also allelic to the recessive gene conditioning the resistance of ‘ASD 7’ (bph 2). IR4-93 inherited its resistance from ‘H-105.’ But both parents of IR747B2-6 and of IR1154-243 were susceptible. We concluded that ‘TKM 6,’ one of the parents of IR747B2-6, is homozygous for Bph 1 but is also homozygous for a gene, I-Bph-1, which inhibits Bph 1. ‘Zenith,’ one of the parents of IR1154-243, may also have a similar inhibitor gene.

Key Words: Insect resistance • Nilaparvata lugens • Inhibitor gene • Hopper burn • Grassy stunt virus

² Former research scholar (presently at Instituto Colombiano Agropecuario, Apartado Aereo 4828, Cali, Colombia), and Plant Breeder, International Rice Research Institute.

Received for publication September 8, 1973.