褐飞虱侵害后不同水稻品种根及地上部氮、磷、钾含量的变化

利用浓硫酸-过氧化氢消煮法，研究了不同耐、感虫品种水稻分蘖期在褐飞虱侵害胁迫后根及地上部间营养成分含量的变化情况。结果表明：褐飞虱侵害协优963后3天，根及地上部N、P、K含量、6天根及地上部N含量、9天地上部N含量在60、120头/株侵害后变化不明显；6天根及地上部P含量、6天根K含量、9天地上部P含量、9天根及地上部K含量在120头/株侵害后显著下降，60头/株侵害后变化不明显；6天地上部K含量、9天根N含量在60、120头/株侵害后均显著下降。对于协优63，3天地上部N含量、3天根及地上部P含量、6天及9天地上部N、P含量在60、120头/株侵害后变化不明显；6天根N、P含量、根及地上部K含量、9天根N含量在120头/株侵害后显著下降，60头/株侵害后下降不明显；3天、9天根及地上部K含量、9天根部P含量在60、120头/株侵害后均显著下降。表明不同水稻品种体内不同营养物质含量在褐飞虱侵害后变化不同，协优63较协优963敏感；K含量变化最明显，其次为P，最后为N；而且根比地上部对褐飞虱的反应敏感。

Changes in levels of nitrogen, phosphorus and potassium in roots and shoots of different rice varieties under infestation by Nilaparvata lugens (St(a)l)(Homoptera: Delphacidae)

Changes of nutrient components in roots and shoots of rice for tolerant and susceptible varieties to Nilaparvata lugens (Stål) infestation were detected by using H₂SO₄ -H₂O₂ method at the tillering stage. For Xie you 963, N, P and K contents in roots and shoots at 3 d after 60 and 120 nymphs/plant infestation and N contents in roots and shoots at 6 d at the tillering stage did not show significant reduction. P contents in roots and shoots at 6 d, K contents in roots at 6 d, P contents in shoots at 9 d and K contents in roots and shoots at 9 d after 120 nymphs/plant infestation decreased significantly but 60 nymphs/plant infestation did not result in significant reduction of P and K contents; K contents in shoots at 6 d and N contents in roots at 9 d after 60 and 120 nymphs/plant infestation showed significant reduction. For Xie you 63, N contents in shoots at 3 d, P contents in roots and shoots at 3 d, N and P contents at 6 d and 9 d after 60 and 120 nymphs/plant infestation did not show significant reduction. N and P contents in roots at 6 d, K contents in roots and shoots at 6 d and N contents in roots at 9 d after 120 nymphs/plant infestation decreased significantly, but 60 nymphs/plant infestation did not result in significant reduction. K contents in roots and shoots at 3 d and 9 d and P contents in roots at 9 d after 60 and 120 nymphs/plant infestation showed significant reduction. The results showed that nutrient components in rice plants under N. lugens infestation varied with rice variety. Xie you 63 was more sensitive than Xie you 963. Reduction of K content was the highest, the next was P and the last was N. Roots were more sensitive to N. lugens infestation compared with shoots.