抄録
The leaf blades of rice plants (Oryza sativa L. cv. Taichung Native 1) infested with adults of the brown planthopper, Nilaparvata lugens, declined in chlorophyll, moisture, soluble protein, and protease activity, but increased in level of free amino-N, and amino acid incorporation compared with leaf blades of uninfested plants. The leaf sheaths of the infested plants showed simillar effects. They also had lower dry weight and level of sugars, than leaf sheaths of uninfested plants. Heavy infestation resulted in over 30-fold increased in the levels of arginine, asparagine, lysine, proline, and tryptophan with a 6-fold increase in free amino acids of leaf blades. Increasingly severe planthopper damage to the plant was accompanied by decline in the rate of leucine-U-14C uptake by the plant. Restriction of feeding site to either leaf blades or leaf sheaths resulted in localized damage.
