水稻品种对白背飞虱的耐虫性反应及稻株营养成分的变化

测定了不同水稻品种对白背飞虱的耐虫性反应及稻株营养成分的变化。结果表明，中抗品种N22、绿源占1号、Mudgo、K89—B5和94D—22具有较高的耐虫性，抗虫品种Ptb33和中组74以抗生性为主，感虫品种秀水11、汕优63和感虫对照品种TN1不具有耐虫性，在白背飞虱为害后，耐虫品种稻株中全N量和可溶性总糖量增加，N／糖比变化率明显下降；而感虫品种的全N量和可溶性总糖量下降，N／糖比变化率明显增加，不同品种受害后体内大多数氨基酸含量均有不同程度的增加，但品种间氨基酸含量减少的种类不同，TN1品种只有丙氨酸含量减少，N22品种除丙氨酸外蛋氨酸和苏氨酸含量也明显减少，Ptb33品种仅精氨酸略有减少。

Tolerance of rice varieties to whitebacked planthopper Sogatella furcifera and variation of nutrient components in rice plants

The study showed that the rice varieties N22, Luyuanzhan No. 1 and 94D-22 had a stronger tolerance to Sogatella furcifera, while Mudgo and K89-B5 had a weaker tolerance. The varieties Ptb33 and Zhongzu 74 were of antibiosis, and susceptible varieties Xiushui 11, Shanyou 63 and susceptible check varieties TN1 had no tolerance. After rice plants were infested by S. furcifera, the percentages of nitrogen content (N%) and soluble sugar content (S%) in tolerant varieties increased, but the ratio of nitrogen content to soluble sugar content (N/S) decreased obviously. For susceptible varieties, the variations of N%, S% and N/S were opposite to those of the tolerant varieties. In different varieties the contents of most kinds of free amino acid increased at various degrees, but those of alanine in susceptible variety TN1, alanine, threonine and methionine in tolerant varieties N22, and arginine in resistant variety Ptb33 decreased.