Sterols and asparagine in the rice plant, endogenous factors related to resistance against the brown planthopper (Nilaparvata lugens).

The brown planthopper (Nilaparvata lugens, abbreviated as BPH)is one of the most harmful insects to rice plants in Asia.From the research into protecting rice plants from BPH, several rice cultivars with marked resistance to the insect have been found among indica rice plants.The Bph 1 gene, which is responsible for BPH-resistance in indica rice, has been introduced into japonica rice from "Mudgo,"1* the most resistant one, to develop several